Dienhathe.com lv 72t-2004_en sivacon lxa lxc

Busbar trunking
systems LXA/LXC
over 800 A
TechnicalInformationLV72.T•2004
8PS
sivacon
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© Siemens AG 2004
SIVACON 8PS
Busbar Trunking
Systems LXA/LXC
over 800 A
Technical Information
LV 72.T · 2004
Introduction
1
System Overview
2
LXA/LXC Busbar Trunking System
3
Further Information
4
Annex
5
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Siemens LV 72.T · 20042
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1/2 Welcome to Automation and Drives
1/3 Low-voltage switchgear -
the basis for progressive solutions
1/4 Totally Integrated Automation -
innovations for more productivity
1/6 Totally Integrated Power -
energy distribution and management
from one source
1/8 SIVACON 8PS –
Busbar Trunking Systems in Action
1/10 SIVACON 8PS –
Engineering Tools for precisely
dimensioned, economical solutions
Introduction
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Welcome to
Automation and Drives
1/2
We would like to welcome you to Automation
and Drives and our comprehensive range of
products, systems, solutions and services for
production and process automation and
building technology worldwide.
With Totally Integrated Automation and
Totally Integrated Power, we deliver solution
platforms based on standards that offer you
a considerable savings potential.
Discover the world of our technology now. If
you need more detailed information, please
contact one of your regional Siemens
partners.
They will be glad to assist you.
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1/3
Low-voltage switchgear and controlgear –
the basis for progressive solutions
Everyday life would be unimaginable without electric power. Competence and innovations
in switching and electrical installation technology are prerequisites so that power can be
used without danger and user-friendly in industrial facilities and buildings. We have been
providing you with these prerequisites for more than 110 years and are permanently de-
veloping new features – innovations which permit you to use power more safely and eco-
nomically.
Low-voltage switchgear from Siemens offers a comprehensive and innovative range of
products covering switching devices for load feeders or the distribution of power, control
and signaling devices as well as complete cabinet systems. Multi-functional, uniform con-
cepts such as Totally Integrated Power, Safety Integrated or ECOFAST additionally permit
our product portfolio to be combined into optimized systems.
All in all, we can provide you with innovative components for switching and electrical in-
stallation technology which utilize state-of-the-art features such as integration and com-
munication as the basis for advanced and uniform solutions which provide you with many
benefits.
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1/4
With the launch of Totally Integrated Automation in 1996, we
were the first ones on the market to consistently implement
the trend from equipment to an integrated automation
solution, and have continuously improved the system ever
since.
Whether your industry is process- and production-oriented or
a hybrid, Totally Integrated Automation is a unique "common
solution" platform that covers all the sectors.
Totally Integrated Automation is an integrated platform for the
Totally Integrated Automation –
innovations for more productivity
Industrial
Ethernet
PROCESS FIELD
GAMMA instabus
Building
Technology
ERP
Enterprise
Resource
Planning
MES
Manufacturing
Execution
Systems
Ethernet
Ethernet
Material
Management
Equipment
Management
Production
Order
Management
Production
Operations
Recording
SIMATIC NET
Industrial
Communication
Industrial Wireless
Communication/
MOBIC
ECOFAST IP65
Decentral
Automation System
Micro-Automation
and
Actuator-Sensor
Interface Level
AS-Interface
PROFIBUS
Industrial
Ethernet
Safety Integrated
Control SINAUT Telecontrol
System
SIMATIC
Software
SIMATIC
Machine Vision
SIMATIC
PC-based Automation
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1/5
entire production line - from receiving to technical processing
and production areas to shipping. Thanks to the system-oriented
engineering environment, integrated, open communications
as well as intelligent diagnostics options, your plant now
benefits in every phase of the life cycle.
In fact, to this day we are the only company worldwide that
can offer a control system based on an integrated platform
for both the production and process industry.
SIMODRIVE
Plant
Information
Management
Detailed
Production
Scheduling
SIMATIC IT Framework
Production Modeler
Product Specification
Management System
Laboratory Information
Management System
Field Instru-
mentation/
Analytics
SIMATIC PCS 7
Process Control
System
SIMATIC
Controller/
Automation
System
SIMOCODE-DP
Motor
Protection
and Control
SIMATIC HMI
Human Machine
Interface
Drive Systems
PROFIBUS PA
SENTRON
Circuit
Breakers
HART
Sensor
Technology
IQ-Sense
SIMATIC
Distributed
I /O
SIMOTION
Motion Control
System
SINUMERIK
Numeric
Control
SINAMICS
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1/6
Totally Integrated Power –
energy distribution and management
from one source
Planning and configuration
Products and systems
Communications
Process/production
automation
Load
manage-
ment
HMI Graphs Prognoses
PROCESS FIELD BUS
Totally Integrated Power™ by Siemens offers integrated
solutions for energy distribution in functional and industrial
buildings covering everything from medium-high voltage to
power outlets.
Totally Integrated Power™ is based on integration in
planning and configuration as well as coordinated products
and systems. In addition, it features communications and
software modules for connecting power distribution systems
to industrial automation and building automation, thereby
offering a substantial savings potential.
£ 110 kV
U
I
coso
P
W
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1/7
Substation
Distribution
Maintenance
task
Hall 1 Air conditioning system
checkup
Distribution 3 Replacing circuit
breaker contacts
Infeed II Replacing meters
Message/
error
manage-
ment
Selective
protection
Protocols Power
quality
Cost center
CODES
V=VACATION
H=HOLIDAY
S=SICK
REGULAR HOLIDAY OTHER
OVER THE HOURS
TIME & ONE-HALF
SICK VACATION
TOTAL HOURS
DATE
IN
OUT
IN
OUT
OVERTIME
SUN MON TUE WED THUR FRI SAT SUN TOTAL
TOTAL HOURS
DATE
IN
OUT
IN
OUT
OVERTIME
TOTAL HOURS
DATE
IN
OUT
IN
OUT
OVERTIME
DATE:
EMPLOYEE
COST CENTER
PAY PERIOD BEGINNING
PAY PERIOD ENDING
central ON
OFF
local ON
OFF
tripped
Building
automation
Main-
tenance
instabus EIB
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1/8
The BD 01 system is quick to install and
ideally suited for use in workshops and
trade premises, as here, at a photo-
grapher’s.
In the petrochemical industry, it is the PEC system that provides
reliable and fault-free power supply.
The ideal system for production lines
needing a great deal of power is the LD
system up to 5000 A.
SIVACON 8PS -
Busbar Trunking Systems in Action
Busbar trunking systems in the low-voltge range
perform the safe and reliable transmission and
distribution of electrical power from transformer
via main distribution board and sub-distribution
board right to the load. Siemens busbar trunking
systems are the complete and efficient answer
in this area:
• The CD system for 25 A up to 40 A
• The BD01 system for 40 A up to 160 A
• The BD2 system for 160 A up to 1250 A
• The PEC system for 800 A up to 6000 A
• The LD system for 1100 A up to 5000 A
• The LX system for 800 A up to 6300 A
Alle these systems are ’Type-tested LV switch-
gear assemblies’ (TTA) to IEC 60 439-1 and -2.
This ensures that they offer a standard of safety
and reliability that meets the particularly high
performance expectations of automated pro-
duction and for building services provision.
Performance characteristics:
• Clear network structure
• Unproblematic retrofitting in the event of load
changes
• Low operating costs due to uninterrupted ser-
viceability
• Simple planning and installation
Room-covering systems for lighting installa-
tions and small loads
The CD system (up to 40 A) allows you to supply
lighting installations covering the whole expan-
se of, say, furniture showrooms, supermarkets
or greenhouses with power, and also provides
the means to easily fix them in position.
Due to its pleasing appearance, the equipment
is well suited for use in sales rooms visited by
the public. On the other hand, its high degree of
protection, to IP54, allows the CD system to be
used even in harsh environments.
The power source for loads with no fixed
location
The BD01 system is ideally suited for the power
supply (up to 160 A) in workshops and trade
premises. The trunking units are easy and quick
to put together. The anti-rotation feature on the
tap-off units makes sure that the units are
correctly fitted and allows for easy retrofitting
even while the production is running.
Other benefits: minimum stock holding and un-
complicated planning due to one standard
frame size for five different current ratings.
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1/9
Universal power distribution
The BD2 system (up to 1250 A) can supply
power to medium-size loads in buildings and in
all industrial applications. Prefabricated tap-off
units fitted with many differing component
combinations make this equipment universally
applicable. Two standard frame sizes covering
all current ratings simplify stock keeping and
planning.
Safe and reliable power transmission in the
petrochemical industry
The PEC resin-insulated system, up to 6000 A,
has a high degree of insulation protection and
thus an enormous resistance to external interfe-
rence factors. This ensures safe and reliable
transport of power even in rough weather or in
highly dust and dirt and corrosion polluted
industrial environments. Typical applications of
this system is the petrochemical industry, waste
incinerators and power stations.
High system serviceability in production
The louvred LD busbar trunking system, up to
5000 A, is the system for transporting current in
production lines with a large energy require-
ment, such as in the automotive industry. A
separate PE busbar ensures that the protective
device in such a system responds reliably even
if the current paths are relatively long. The high
short-circuit rating allows medium-voltage
switches to be used as protective elements for
the transmission of power between transformer
and main circuit-breaker. Tap-off units up to
1250 A available as standard.
Flexible power distribution in multi-storey
buildings
The LX sandwich-style system, up to 6300 A, is
used where large quantities of power need to be
transported, uninfluenced by the mounting posi-
tion of the system.
Conductor configurations with the PE conductor
insulated along its entire length, and a double-
size neutral can ensure the interference-free dis-
tribution of power in places such as radio
stations, computer centres or at internet
providers’. The system is protected to IP54 as
standard, and tap-off units up to 1250 A availa-
ble as standard.
Siemens offers modular component cabinets for indication, control and monitoring of the
flow of power through busbar trunking systems. These cabinets are equipped with bus
interfaces, control circuit devices and power meters.
The LX busbar trunking system is the perfect equipment for multi-
storey buildings where large quantities of power need to be transpor-
ted, uninfluenced by the mounting position of the system.
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1/10
Engineering tools from Siemens help generate
precisely dimensioned and economical plan-
ning and design solutions, even for complex ap-
plications.
MatSelect
Using MatSelect, product and material data can
be administered with self designed or
standardised classification systems. It has inter-
faces to Eldanorm, Datanorm, ASCII format and
ProPlan.
NetPlan
Planning software for power flow, short-circuit
calculation and device dimensioning with selec-
tivity analysis and protective against electric
shock of low-voltage networks, available in
English, German, French and Italian.
NetSelect
Selection software for protective switches to en-
able star networks to be correctly dimensioned;
available in several languages.
BusbarSelect
Selection aid for generating quotations, invitati-
ons to tender and orders for busbar trunking
systems up to 1250 A; available in several
languages.
Quotation texts
Prepared texts (in German) for generating
customer specifications in the formats: Architext
excellent, GAEB 81 and Word 97.
Should you have any queries concerning instal-
lation, functionality or application options –
please mail us at
sbts.tool_support@siemens.com
We will be pleased to assist you.
Netplan enables you to graphically represent the network and to
calculate the load flow and the prospective one-pole to all-pole short
circuitcurrent/load.
In BusbarSelect you select the trunking units for your system from a menu,
and then transfer them into an order or quotation list.
SIVACON 8PS - Engineering Tools for
precisely dimensioned, economical solutions
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2/2 System description
2/6 System selection criteria
System Overview
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System description
Siemens LV 72.T · 20042/2
System Overview
2
Developing a power distribution concept, including system and
component configurations, involves finding an effective solution
based on customer requirements and supplier technology. This
design information brochure for the LX busbar trunking system for
rated currents ranging from 800 A to 6300 A, is designed to help
with this task.
Descriptions of the different systems, their technical features and
areas of application are provided, as well as drawings of the indi-
vidual busbar trunking system elements. Details vital for planning
are emphasized and explained.
The section entitled, “Further Information” suggests approaches for
creating effective planning solutions. Individual engineering princi-
ples are introduced and detailed information on subjects such as fire
barriers and functional endurance is provided.
Siemens offers services and engineering tools for preparing tender
specifications. An overview and explanation of functions and
features is also included in this section.
Creating a design concept for a power supply system, not only
involves observing applicable standards and regulations, but also
examining and clarifying economic and technical requirements.
Electrical equipment, such as distribution boards and transformers,
should be selected on the basis of their suitability in terms of the
overall system – not just in terms of their individual features.
Components should not only be appropriate for rated operation, but
should also be suitably dimensioned to withstand fault situations. A
power distribution concept should also take the following points
into consideration:
– Building type, use and form (for example, high-rise building, flat
buildings and number of floors)
– Load centers and possible supply paths and locations for
transformers and main distribution boards
– Building-dependent ratings based on maximum demands per
unit area depending on what the building is used for
– Regulations and guidelines of building authorities
– Power supply company guidelines.
There will always be more than one possible solution which will
have to be assessed in terms of its technical and economic
advantages and disadvantages. In making this assessment, the
following requirements should be a priority:
– Simple and transparent design
– Long service life
– High availability
– Low fire load
– Flexible adaptation to building modifications.
These requirements are generally easy to meet with appropriate
busbar trunking systems. For this reason, engineers increasingly
favour busbar trunking systems over cable installations for power
transmission and distribution applications. Siemens offers busbar
trunking systems for rated currents ranging from 25 to 6300 A:
– The CD busbar trunking system for 25 to 40 A is ideal for
supplying lights and small consumers
– The BD01 busbar trunking system for 40 to 160 A is designed for
supplying workshops with tap-offs up to 63 A
– The BD2 busbar trunking systems for 160 to 1250 A is designed
for supplying medium-sized consumers in buildings and in
industry
– The ventilated LD busbar trunking system is designed for
supplying consumers with a high power consumption in indus-
trial applications
– The LX sandwich system is designed for supplying large power
requirements in buildings
The design information brochure LV 71.T is available for designing
the BD2 and LD busbar trunking systems.
General
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System description
Siemens LV 72.T · 2004 2/3
System Overview
2
Figure 1: busbar trunking systems
BD
01
BD0
1-K
B
BD0
1-K
B
LX
LD LX
BD01
CD
LD
BD2
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System description
System Overview
2
The complexity of today‘s buildings makes power distribution with
a high level of transparency and flexibility an indispensable require-
ment. The uninterrupted provision of power is also absolutely essen-
tial for production plants with multiple shifts.
Busbar trunking systems meet these demands for an economical
power distribution system with simple design, fast installation,
optimum flexibility and safety by offering:
– Straightforward network structures
– Minimum space requirements
– Easy retrofitting with sudden changes in location and consumer
ratings
– High short-circuit rating and low fire load
The LX busbar trunking system is a type-tested low-voltage
assembly (TTA) in accordance with IEC/EN 60 439-1 and 2 in the
form of an aluminium enclosed sandwich system. The LX sandwich
system consists of busbars, insulation, the aluminium enclosure and
the fastening and connection elements.
Purpose and types of busbar trunking systems
Figure 2: LX trunking unit with joint block
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System description
Siemens LV 72.T · 2004 2/5
System Overview
2
Various busbar trunking system components are responsible for
transporting power between transformers and low-voltage power
distribution systems. They are used between the transformer and
main distribution board and then on to the subdistribution level.
Trunking units without tap-off points, available in standard lengths,
are used for transporting power. In addition to the standard lengths,
customers can select lengths from several ranges to meet their
particular building requirements.
The main application of busbar trunking systems is power distribu-
tion. The advantage of such systems over cable installations is that
the locations of power tap-off points are not permanent, – but can
be moved to any position within the entire system. To tap power at
any given point simply requires positioning a tap-off unit at that
location on the busbar.
The result is a flexible distribution system for decentralized power
supply to a particular line or area. Tap-off points can be mounted on
one or both sides of straight trunking units.
The LX busbar trunking system provides tap-off units from 80 A to
1250 A for power tap-offs and for connecting consumers, providing
the power supply for consumers in the range between 10 kW and
over 400 kW. Tap-off units can be fitted with either fuse switches or
circuit-breakers.
With all busbar trunking systems, pluggable tap-off units have a
high safty standard, the following requirements will be full filed by
all tap-off units:
– Early-make PE contact for mounting and late-break contact for
removing
– With the cover open, no live part can be accessed (protection
IP2X).
– Mounting should only be possible in the correct phase sequence.
The plug-in LX tap-off units up to 630 A meet these requirements.
The LX tap-off units from 800 A to 1250 A are fitted permanently to
the connection points of the trunking units and cannot be fitted/
removed while the system is live. Installation is only permissible
when the system is isolated.
Purpose and types of busbar trunking systems
Power distribution
Figure 3: Tap-off units for flexible power tapping
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System selection criteria
System Overview
2
Selection of LXA/LXC or LDA/LDC
LXA/LXC LDA/LDC
Rated operational voltage Ue VAC 690 1000
Standard degree of protection IP54 IP341)
Rated current Ie A 800 – 6300 1100 – 5000
Permissible load (Ie) depending on
Mounting position
Horizontal edgewise % 100 100
Horizontal, flat % 100 59 – 68
Vertical % 100 76 – 88
IP54 protection % 100 64 – 82
Rated short-time withstand current Icw (1 s) kA 25 – 150 55 – 116
Conductor configurations
L1, L2, L3, PE = Enclosure K –
L1, L2, L3, m PEN – K
L1, L2, L3, PEN K K
L1, L2, L3, N, PE = Enclosure K –
L1, L2, L3, m N, PE = Enclosure – K
L1, L2, L3, N, PE K K
L1, L2, L3, 2 N, PE = Enclosure K –
L1, L2, L3, 2 N, PE K –
L1, L2, L3, N, (PE)2), PE = Enclosure K –
L1, L2, L3, 2 N, (PE)2), PE = Enclosure K –
Dimensions width x height
Al systems/1000 A and Cu systems/1250 A mm x mm 145 x 137 180 x 180
Fire load
Tap-off unit without tap-off point kWh/m 1.83 – 16.32 4.16 – 8.83
Per tap-off point kWh/m 2.9 7.8 – 10.8
1) Taking current reduction into account also available with IP54 protection
2) (PE) = Additional insulated PE conductor (clean earth)
3) Voltage drop in millivolts per 1 m per ampere, 3-phase 50Hz, cos v = 0.9, with a fully symmetrical load,
concentrated load tap-off and supply from one end
4) Magnetic field values given in microtesla with a fully symmetrical load at a distance of 0.5 m from the busbar system
(the measuring points are in the axis from direction 3 and direction 7 h see chapter Further Information under Magnetic Fields)
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Siemens LV 72.T · 2004 2/7
System Overview
2
Voltage drop3)
Al systems/1250 A mV/A/m 0.127 0.116
Al systems/2500 A mV/A/m 0.051 0.068
Al systems/4000 A mV/A/m 0.03 0.043
Cu systems/2000 A mV/A/m 0.064 0.089
Cu systems/5000 A mV/A/m 0.02 0.03
Magnetic fields4)
Al systems/1600 A mT 10.84 10.60
Al systems/2500 A mT 20.54 9.00
Al systems/4000 A mT 30.62 13.00
Cu systems/2000 A mT 11.66 9.70
Cu systems/5000 A mT 37.22 14.40
Max. fixing intervals
Al systems m 2 – 3 5 – 6
Cu systems m 2 – 3 2 – 3
Tap-off units can be changed when system is live A 80 – 630 80 – 1250
Maximum number of tap-offs with pluggable tap-off units
over 3 m length when using tap-off units
From 80 to 125 A 6 3
From 160 to 630 A 4 3
From 800 to 1250 A 0 2
Tap-off units with fuses A 100 – 630 80 – 630
Rated conditional short-circuit current Icf kA 100 (80) 120
IEC standard K K
BS standard K –
NF standard K –
Tap-off units with circuit-breaker A 80 – 1250 80 – 1250
Rated conditional short-circuit current Icc
For size 1 to 125 A kA 65 100
For size 2, 3, 4 to 630 A kA 65 100
For size 5 to 1250 A kA 85 (100) 100
Manual operation K K
Remote operation – K
LXA/LXC LDA/LDC
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System Overview
2
LXA/LXC and LDA/LDC systems are available for distributing large
power requirements in buildings. For this type of application busbar
trunking systems frequently have to meet the following require-
ments:
– Flexible power distribution in high-rise buildings
– Safe power supply for electronic consumers
To meet these requirements the LXA/LXC systems have very favour-
able features in terms of design, high load capacity of the neutral
conductor as well as an additional isolated PE conductor.
Nevertheless, there are applications for which use of the LDA/LDC
system is recommended. LD systems are ideally used in applications
with primarily horizontal busbar runs and required protection to
IP34.
When used in industrial applications, busbar trunking systems have
to meet a high level of requirements in terms of short-circuit ratings.
In power supply systems for manufacturing plants with a high power
requirement, such as with welding robots in welding lines, very high
short-circuit currents can occur that require the use of very robust
consumer tap-offs. The LDA/LDC systems are ideal busbar trunking
systems for typical industrial applications. LXA/LXC systems may,
however, also be useful in particular industrial applications such as
in operating areas exposed to fire hazards. In this kind of application
protection to IP5x is required, where there is a risk of fire due to
inflammable dust.
Building applications Industrial applications
Sector Selection criteria LX LD
Building applications
Banks,
insurance companies
– Power distribution in multi-storey buildings requiring primarily vertical busbar runs,
fire load
K –
Internet providers, IT centres,
broadcasting buildings
– Electronic consumers subject to harmonics overload the neutral conductor
– Interference potentials in the enclosure impair functioning of the consumer
K –
Shopping centres, furniture stores, trade
fairs, airports, hospitals, clinics, offices
– High density of consumer tap-offs in a small space
– Power distribution requires vertical busbar runs
K –
– Electromagnetic field emissions of power transfer unit impair operation of consumers
in the vicinity
– Power distribution in multi-storey buildings requiring primarily vertical busbar runs
and IP34 protection is sufficient
– K
Industrial applications
Automotive, metalworking, machine
building, computers, microchips,
telecommunications, chemical,
pharmaceutical, food processing
industries
– Pluggable consumer tap-offs up to and including 1250 A
– High short-circuit rating of consumer tap-offs Icc = 100 kA/Icf = 120 kA
– K
– Electronic consumers subject to harmonics overload the neutral conductor
– Interference potentials in the enclosure impair functioning of the consumer
– Pluggable consumer tap-offs up to 630 A are sufficient
– IP54 protection required
K –
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Siemens LV 72.T · 2004 2/9
System Overview
2
IEC 364 stipulates that electrical equipment must be selected
according to the type of system at hand in order to determine the
protective measures required. For the LX system this selection is
based on the appropriate conductor configuration.
Neutral conductor cross-section
The rise in new electronic consumers that are sensitive to interfer-
ence, particularly near the power supply in the building, is
presenting busbar trunking systems with new challenges. Interfer-
ence from electromagnetic fields and harmonics in the mains supply
impair the correct functioning of computers, servers and many other
state-of-the-art electronic devices. Particularly, the large number of
AC consumers in a mains supply place a high load on the neutral
conductor on account of the resulting harmonics. Double neutral
conductor cross-sections (200 %) reduce the susceptibility of the
system in networks subject to harmonics.
PE conductor cross-section
A large PE conductor cross-section also provides optimum safety for
the power supply since the reduced loop impedance ensures rapid
interruption of short-circuit currents. This consequently reduces the
risk of possible downtimes thanks to the rapid disconnection of
upstream protective devices.
Clean earth
Insulated PE conductors offer optimum reliability and safety in the
power supply of electronic consumers in buildings on account of
their complete insulation from the busbar enclosure. In the event of
a short-circuit between the phase and the consumer enclosure this
PE conductor (clean earth) is not affected by this fault and is there-
fore potential-free during a short-circuit to an exposed conductive
part. Even leakage currents in the enclosure due to magnetic fields
do not affect the clean earth. The clean earth is therefore ideal as
the PE connection for susceptible electronic loads.
The following tables compare the conductor cross-sections
L1, L2, L3, PEN, N, PE and clean earth of different conductor config-
urations. The appropriate values in mm2 are contained in the Tech-
nical Data.
System type Conductor configuration
TN-C LX...41
TN-C-S 1)
TN-S LX...51
LX...52
LX...53
LX...54
LX...61
LX...62
TT LX...51
LX...52
LX...53
LX...54
IT LX...30
1) An appropriate conductor configuration is not available as an
LX system. However, the PEN conductor can be divided into an
N and PE conductor in the tap-off unit when using an
LX..41 4-conductor system.
N and PE conductor cross-sections/clean earth
Cross-sections for PEN, N, PE conductors compared to the conductor cross-section
System Cross-sections
L1, L2, L3 PEN N PE Clean earth
LX..30 100 % – – Enclosure –
LX..41 100 % 100 % + Enclosure – – –
LX..51 100 % – 100 % Enclosure –
LX..52 100 % – 200 % Enclosure –
LXC.531) 100 % – 100 % 100 % + Enclosure –
LXC.541) 100 % – 200 % 100 % + Enclosure –
LX..61 100 % – 100 % Enclosure 100 %
LX..62 100 % – 200 % Enclosure 100 %
1) Each conductor configuration contains an additional busbar as PE conductor. The PE conductor is electrically connected to the enclosure.
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Siemens LV 72.T · 20042/10
System Overview
2
Example:
What are the cross-sections of systems for:
a) LXA0461
L1, L2, L3, N, clean earth: 100 %
PE (enclosure): 173 % in Cu equivalent
b) LXC0554
L1, L2, L3: 100 %
N: 200 %
PE (enclosure + busbar): 219 % in Cu equivalent
Enclosure cross-section compared to conductor
cross-section (Cu equivalent)
System Enclosure cross-section
LXA(C)01.. 324 %
LXA(C)02.. 245 %
LXC03.. 230 %
LX(C)A04.. 173 %
LXA(C)05.. 119 %
LXA(C)06.. 113 %
LXA(C)07.. 84 %
LXA(C)08.. 119 %
LXA(C)09.. 113 %
LXA10.. 84 %
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Siemens LV 72.T · 2004 2/11
System Overview
2
Rated currents and short-circuit currents of standard transformers
Rated voltage UN 400/230 V 690/400 V
Relative short-circuit voltage uk 4 %1) 6 %2) 4 %1) 6 %2)
Rated power
kVA
Rated current
A
Short-circuit current3)
I"k
A
Rated current
A
Short-circuit current3)
I"k
A
50 72 1805 – 42 1042 –
100 144 3610 2406 84 2084 1392
160 230 5776 3850 133 3325 2230
200 288 7220 4812 168 4168 2784
250 360 9025 6015 210 5220 3560
315 455 11375 7583 263 6650 4380
400 578 14450 9630 336 8336 5568
500 722 18050 12030 420 10440 7120
630 909 22750 15166 526 13300 8760
800 1156 28900 19260 672 16672 11136
1000 1444 36100 24060 840 20840 13920
1250 1805 45125 30080 1050 26060 17480
1600 2312 57800 38530 1330 33300 22300
2000 2888 72200 48120 1680 41680 27840
2500 3612 90300 60200 2094 52350 34900
3150 4546 113650 75780 2636 65893 43933
1) uk = 4 %, standardized to DIN 42500 for SNT = 50 – 630 kVA
2) uk = 6 %, standardized to DIN 42500 for SNT = 100 – 1600 kVA
3) I"k = Initial symmetrical short-circuit current of transformer when connected to a system with unlimited short-circuit capacity
Approximation formula
Rated current of transformer Short-circuit current of transformer
IN [A] = k x SNT [kVA] I"k = IN/uk x 100 400 V: k = 1.45
690 V: k = 0.84
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Siemens LV 72.T · 20042/12
System Overview
2
LXA/LXC selection depending on transformer rated values
Transformer rated values LX system
Rated current
I
A
Rel. short-
circuit
voltage
uk
%
Uninter-
rupted
short-circuit
current
I"k
kAeff
Peak short-
circuit
current
Ipk
kA
Type Rated current
Ie
A
Rated short-time
withstand
current
Icw
kAeff
Rated impulse
withstand
current
Ipk
kA
910 6 15.15 38.58 LXA02
LXC01
1000
1000
35
38
70
80
1155 6 19.25 49.00 LXA04
LXC02
1250
1250
50
50
110
110
1444 6 24.06 61.24 LXA05
LXC04
1600
1600
60
60
132
132
1805 6 30.07 76.57 LXA06
LXC05
2000
2000
75
75
158
165
2310 6 38.50 98.00 LXA07
LXC06
2500
2500
86
86
194
189
2887 6 48.11 122.50 LXA08
LXC07
3200
3200
100
100
220
220
3609 6 60.11 153.10 lXC09
LXC08
4000
4000
140
150
220
255
4546 6 75.78 192.90 LXC09 5000 150 255
Figure 1: Connecting a transformer to a distribution board
■
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3/2 System description
3/4 System components
3/21 Technical Data
3/39 Dimension drawings
LXA/LXC Busbar Trunking
System
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System description
3
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System description
Siemens LV 72.T · 2004 3/3
3
The LX busbar trunking system is used for
both power transmission and distribution.
The system offers an outstanding level of
flexibility in terms of location requirements
and is particularly suitable for power distri-
bution in multi-storey buildings. The high
degree of protection to IP54 as well as tap-
off units up to 1250 A also guarantee safe
power distribution for the high energy
requirements of industrial applications.
1 Straight trunking units
With or without fire barrier,
fire resistance class
S 120 DIN 4102 Part 9
Degree of protection IP54,
(IP55 on request)
Conductor configuration
– Standard lengths
3 m/2 m/1 m
– Optional lengths of
0.35 – 2.99 m
– For horizontal and vertical installation
Straight trunking units with tap-off
points
– Tap-off points on one side
– Tap-off points on both sides
– Protection against direct contact to IP20
during fitting and
removal of tap-off units
– Correct orientation feature: protection
against incorrect
connection (key-into-lock principle)
a Page 3/11
2 Pluggable Tap-off units
With either fuse switch-disconnectors or
circuit-breakers
Early-make PE(N) connection contact during
fitting
Safety resulting from fixed fitting/removal
sequence
Sheet steel enclosure degree of protection
IP54
Protection against direct contact IP20 during
fitting
Permanently installed tap-off units
Fitted with circuit-breakers
Safety resulting from fixed fitting/removal
sequence
Sheet steel enclosure degree of protection
IP54
Protection against direct contact IP20 during
fitting
Tap-off via joint block
a Page 3/16
3 Feeder units
Transformer feeder units, enclosed
– For rated currents from
800 A – 6300 A
– Connection lugs for all normal spacings
– Phase sequence to specification
Distribution board feeder units
800 A – 5000 A
Cable feeder units
800 A – 3200 A
– Cable entry via cable grommets with cable
anchoring rail
a Page 3/14
4 Connection to Siemens power
distribution systems
For distribution connection to from
– above
– below
a Page 3/13
5 Junction units
For flexible engineering to adapt to struc-
tural features with
– Elbow, offset elbow
– Knee, offset knee
– Z units
– T units
a Page 3/11
6 Accessories
End flange
Joint block
Fixing bracket
Connection tool
a Page 3/20
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System components
3
Basic description of busbar trunking systems 800 A to
6300 A
Busbar trunking systems can be supplied as type-tested low-voltage
switchgear and controlgear assemblies (TTA) that are ready to
connect and install.
The following information is part of the calculation and contractual
elements. It must be taken into account with the descriptions of the
individual systems and related equipment, even if they are not
mentioned in detail.
The busbar trunking system must be suitable for transporting
energy, for example, between transformers and low-voltage sub-
distribution boards, for distributing energy in order to supply entire
areas, as well as for both horizontal and vertical installation.
The busbar trunking system must consist of listed system modules
such as:
– Straight trunking units with/without tap-off points
– Feeder units for transformer, distribution board and cable feeder
units
– Junction units with elbow, offset elbow, knee, offset knee, Z units
and T units
– Tap-off units
All units must be available from the factory in standard and optional
lengths. Flexible junction units and standard junction units as cable
units are not permitted. Expansion units and fixed points must be
designed as required.
The trunking units with tap-off openings must be fitted with
pluggable tap-off units as required. The location and number of tap-
off points must be optional. The pluggable tap-off units are
protected against incorrect mounting (180° orientation feature).
The permanently installed tap-off units can only be fitted or
removed when the system is de-energized and should be protected
against incorrect mounting (180° orientation feature). Depending
on the version being used, isolation of the pluggable tap-off units
during removal is ensured either through a compulsory sequence of
operations or cautionary instructions.
If necessary, the busbar trunking system can be equipped with an
asbestos-free fire barrier for the wall or ceiling openings which
complies with fire resistance class S120.
The enclosure is made from aluminium with a light grey RAL7035
paint finish. The cross-section of the trunking units must not exceed
the specified dimensions in the Technical Data. The connection
point of two trunking units must not protrude above the external
level of the enclosure run.
The individual system modules must be connected by tightening a
state-of-the-art single-bolt clamp. The conductors between two
system units should not be connected with screws.
The busbars must be made from aluminium or copper and be
isolated along their entire length, nickel-plated (aluminium) and tin-
plated. The conductor cross-sections should not be below the values
given in the Technical Data.
Fire load should not exceed the value given in the Technical Data.
Conformity and test certificates
The manufacturer of the busbar trunking system must maintain and
certify an EN/ISO 9001 quality management system.
Certificates or declarations of conformity must confirm the following
qualifications for the entire system:
– Type testing according to IEC/EN 60 439-1 and -2 (DIN VDE Part
500 and Part 502)
– Climatic proofing to DIN IEC 68 Part 2-3 and Part 2-30
– Fire barrier to DIN 4102 Part 12
– Proof that system is maintenance-free
– Freedom from silicon or halogens
– Separate busbars for PE
Reliable proof of special, additional features (such as sprinkler test)
of system components must be available.
Preliminary comments for tender specifications
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System components
Siemens LV 72.T · 2004 3/5
3
Technical data for LXA/LXC busbar trunking system
Ambient temperature
min./max./24-hour average –5/+40/35 °C
Protection type IP54
Torque setting for joint block 120 + 10 Nm
Busbar surface treatment Insulated over the entire length
Trunking unit material Paint finish aluminium housing
Colour of trunking units RAL 7035 (light grey)
Rated insulation voltage Ui 690 V AC, 800 V DC
Rated operational voltage Ue Up to 690 V AC
Rated frequency f 50 Hz
Rated current Ie _______1)
Rated short-time withstand current
– Phase conductors Icw (1s)
– Neutral conductor Icw (1s)
– 5th conductor Icw (1s)
_______1)
_______1)
_______1)
Rated peak withstand current Ipk _______1)
Conductor material AL/CU2)
Number of busbars _______1)
Conductor cross-sec.
– L1, L2, L3
– N
– PE (equivalent copper cross-section)
– Insulated PE conductor (clean earth)
_______1)
_______1)
_______1)
_______1)
Fire loads
– Tap-off unit without tap-off point
– Per tap-off point
_______1)
2.9 kWh
Max. fixing intervals
– Horizontal edgewise
– Horizontal, flat
_______1)
2 m
Enclosure dimensions _______1)
Weight _______1)
1) Enter the values from the Technical Data for the system you selected. For values see Technical Data.
2) Cross out information which does not apply.
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System components
3
The basic components of the LX system are determined using a type
reference key. The type is defined and selected according to the rated
current, conductor material, system type and conductor configuration.
The following type reference key permits precise definition of the
system required.
Selection example:
A rated current of 2500 A is required for a given project. The
conductor material to be used is aluminum. A 5-pole system is
required. The cross-section of the N conductor should be equal to
the cross-section of the phase conductor.
The following type is therefore required: LXA0751
Type reference key
1) PE conductor = Enclosure
2) Separate PE conductor by means of an insulated busbar (clean earth)
3) Double cross-section of neutral conductor (200 %) by means of additional busbar
4) PE conductor = Enclosure and additional busbar
5) Only available as copper system (LXC)
Rated current Ie [A]
Al Cu Code
800 1000 01
1000 1250 02
– 1400 03
1250 1600 04
1600 2000 05
2000 2500 06
2500 3200 07
3200 4000 08
4000 5000 09
4500 – 10
Conductor material
Al A
Cu C
Code Conductor configuration:
30 L1 + L2 + L3 + PE1)
41 L1 + L2 + L3 + PEN/PEN4)
51 L1 + L2 + L3 + N + PE1)
52 L1 + L2 + L3 + N + N3)+ PE1)
535) L1 + L2 + L3 + N + PE/PE4)
545) L1 + L2 + L3 + N + N3) + PE/PE4)
61 L1 + L2 + L3 + N + (PE)2) + PE1)
62 L1 + L2 + L3 + N + N3) + (PE)2) + PE/PE1)
Fire barrier
Positioning X*
LX -.... +LX -S120-X..... .. ..
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System components
Siemens LV 72.T · 2004 3/7
3
The busbars of the LX busbar system are normally tin-plated and
covered with highly resistant insulating material. The conductor
material of the LXA system is aluminium and the conductor material
of the LXC system is copper. Aluminum busbars are provided with
both a tin and nickel plating.
The sandwich-type construction of the LX busbar system means that
its current carrying capacity is not affected by the mounting posi-
tion, thus offering optimum flexibility in the design of busbar runs.
Current reduction is not required for edgewise or flat busbar posi-
tions in both horizontal busbar runs and risers (vertical busbar runs).
Busbars
Figure 1: LXA, LXC busbar trunking systems
a Aluminium busbar (LXA), Copper busbar (LXC)
b Nickel layer, tin coating (LXA), tin coating (LXC)
c High-temperature resistant insulation coating
ቢ
ባ
ቤ
Mounting positions and rated current
Figure 2: Busbar run horizontal, busbar position edgewise
Figure 3: Busbar run horizontal, busbar position flat
Figure 4: Busbar run vertical
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System components
3
The sizes depend on the rated current and the conductor material.
There are a total of ten sizes. Seven sizes are designed as single
systems and three sizes as double systems.
Single systems consist of an enclosure with 3 to 6 aluminium or
copper busbars. Double systems have between 6 and 12 busbars in
two enclosures.
The exact number of busbars depends on the conductor configura-
tion required.
Sizes
Sizes (H x B1))
Height H
[mm]
System Height H
[mm]
System
137
137
162
162
207
287
287
LXA(C)01
LXA(C)02
LXC03
LXA(C)04
LXA(C)05
LXA(C)06
LXA(C)07
439
599
599
LXA(C)08
LXA(C)09
LXA10
1) Width B always 145 mm
145
H
145
H
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System components
Siemens LV 72.T · 2004 3/9
3
The LX busbar system is available in eight different conductor
configurations, depending on the type of system required, the N and
PE cross-sections and the possible additional insulated
PE conductor (clean earth)
System Conductor configurations Enclosure
a b c d e f
LX...30 L1 L2 L3 – – – Enclosure is the PE conductor
LX...41 L1 L2 L3 PEN – – Electrical connection between
enclosure and PEN
LX...51 L1 L2 L3 N – – Enclosure is the PE conductor
a b c
abcd
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System components
Siemens LV 72.T · 20043/10
3
LX...52 L1 L2 L3 N N – Enclosure is the PE conductor
LX...53 L1 L2 L3 N PE – Electrical connection between
enclosure and PE
LX...61 L1 L2 L3 N Clean
earth
– Enclosure is the PE conductor
LX...54 L1 L2 L3 N N PE Electrical connection between
enclosure and PE
LX...62 L1 L2 L3 N N Clean
Earth
Enclosure is the PE conductor
System Conductor configurations Enclosure
a b c d e f
abcde
bcdefa
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System components
Siemens LV 72.T · 2004 3/11
3
Straight trunking units for horizontal and vertical installation
without tap-off points:
Standard lengths
1 m: LX.....-1
2 m: LX.....-2
3 m: LX.....-3
Optional lengths:
0.35 m – 0.99 m: LX.....-1W*
1.01 m – 1.99 m: LX.....-2W*
2.01 m – 2.99 m: LX.....-3W*
Straight trunking units for horizontal and vertical installation with
tap-off points:
Standard lengths with up to 10 tap-off points
3 m: LX.....-3-ADO-U+LX-A(B, C, D, E)
2, 4, 6, 8 or 10 tap-off points selectable on both sides
LX.....-3-AD+LX-A(B, C, D, E)
1, 2, 3, 4 or 5 tap-off points selectable on one side
2 m: LX.....-2-1AD
1 tap-off point
Optional lengths with 1 tap-off point
1.50 m – 2.00 m: LX.....-1W*-1AD
2.01 m – 2.50 m: LX.....-2W*-1AD
2.51 m – 3.00 m: LX.....-3W*-1AD
Elbow LX.....-L-X*/Y*
For LX.01 to LX.10
X = 0.35 – 1.09 m
Y = 0.35 – 1.09 m
Z unit LX.....-X*/Y*/Z*
For LX.01 to LX.10
X/Y = 0.35 – 1.09 m
Z = 0.40 – 0.70 m
Straight trunking units
L
L
LX-BLX-A
LX-C
LX-D
LX-E
Junction units
X Y
X
Y
Z
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System components
Siemens LV 72.T · 20043/12
3
Knee LX.....-L-X*/Y*
For LX.01 to LX.04
X/Y = 0.35 – 1.09 m
For LX.05 to LX.07
X/Y = 0.50 – 1.21 m
For LX.08 to LX.10
X/Y = 0.80 – 1.52 m
* = Optional length in m
Important planning information:
The minimum limb lengths for X and Y (Z) with elbow and Z unit
junction units depend on the standard enclosure width (145 mm),
the knee junction unit depends on the changing enclosure height
(depending on system size 137 mm, 162 mm, 207 mm, 287 mm,
439 mm or 599 mm)
Junction units
Z unit LX.....-Z-X*/Y*/Z*
For LX.01 to LX.04
X/Y = 0.35 – 1.09 m
Z = 0.40 – 0.70 m
For LX.05 to LX.07
X/Y = 0.50 – 1.21 m
Z = 0.70 – 1.00 m
For LX.08 to LX.10
X/Y = 0.80 – 1.52 m
Z = 1.33 – 1.60 m
Offset elbow LX.....-L-X*/Y*/Z*
For LX.01 to LX.04
X/Y = 0.35 – 1.09 m
Z = 0.40 – 0.70 m
For LX.05 to LX.07
X/Y = 0.50 – 1.21 m
Z = 0.52 – 0.85 m
For LX.08 to LX.10
X/Y = 0.80 – 1.52 m
Z = 0.84 – 1.15 m
X
Y
X
Y
Z
Y
XZ
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System components
Siemens LV 72.T · 2004 3/13
3
T unit LX.....-T-X*/Y*/Z*
For LX.01 to LX.04
X/Y/Z = 0.35 – 1.09 m
For LX.05 to LX.07
X/Y/Z = 0.50 – 1.21 m
For LX.08 to LX.10
X/Y/Z = 0.80 – 1.50 m
* = Optional length in m
Important planning information:
The minimum limb lengths for X, Y and Z with Z unit, offset elbow
and T unit junction units depend on the changing enclosure height
(depending on system size 137 mm, 162 mm, 207 mm, 287 mm,
439 mm or 599 mm)
Connecting the Siemens power distribution system as a type-tested
low-voltage switchgear and controlgear assembly (TTA) as per IEC/
EN 60 439-1 and -2
The power distribution board and LX busbar trunking system are
connected using an integrated busbar trunking connection unit for
rated currents up to 5000 A. This busbar connection can be made
from above or below, thus ensuring flexible connections. The copper
connections provided at the factory between the power distribution
system and busbar trunking system offer a high short-circuit rating
that is type-tested to ensure a high level of safety in power trans-
mission.
X
Y
Z
Distribution board connection for Siemens power
distribution systems
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System components
Siemens LV 72.T · 20043/14
3
General
To connect the busbar system to a non-Siemens distribution board,
an LX.... - FA connection unit for non-Siemens distribution boards
can be used. The connection unit is built into the distribution board
and serves as an interface to the copper connections of the
distribution system.
Versions
The connection units for non-Siemens distribution boards are
normally made of copper. Eight different conductor configurations
are available depending on the type of system in place. The rated
currents up to 5000 A meet the specifications given in the Technical
Data. In accordance with IEC/EN 60 439-1 and 2 temperature rises
caused by current heat should not exceed the permissible tempera-
ture limit for power distribution systems. The maximum temperature
for the insulated busbars is 135 °C. The terminal capacity for the
copper connections can be found in the Technical Data.
Installing the connection unit
The distribution board manufacturer is responsible for designing
and installing the copper connections of the distribution board’s
connection unit, or this work must at least be carried out in
accordance with the manufacturer’s instructions. The manufacturer
must ensure that the required short-circuit rating is provided and
that the permissible temperature limit of the connection unit for
non-Siemens distribution boards is not exceeded.
The different rated currents, phase sequences and phase distances
involved in transformers make for the wide range of transformers
available.
This calls for a high level of flexibility when it comes to connecting
busbar systems.
The universal connector unit can also be used for connecting
distribution boards.
LX busbar trunking systems up to 6300 A include transformer
connection units with a side busbar connection (LX.....-AS.) and
with a busbar connection from the top (LX.....-AS.-T.).
a: The total length depends on the distance between the phases
of the connection units
(approx. 3 x lug spacing + 300 mm)
Connection unit LX.....-AS1
selectable lug spacing 115 – 400 mm
possible phase sequences for AS1 and AS3:
L1, L2, L3, N (PEN)
N (PEN), L3, L2, L1
L3, L2, L1, N (PEN)
N (PEN), L1, L2, L3
possible phase sequences:
L1, L2, N (PEN), L3
L3, N (PEN), L2, L1
L3, L2, N (PEN), L1
L1, N (PEN), L2, L3
Connection unit for non-Siemens distribution boards Connection units for transformers and distribution boards
a
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System components
Siemens LV 72.T · 2004 3/15
3
a: The total length depends on the distance between the phases
of the connection units
(approx. 3 x lug spacing + 300 mm)
Connection unit LX.....-AS1-T
possible phase sequences for AS1 and AS3:
L1, L2, L3, N (PEN)
N (PEN), L3, L2, L1
L3, L2, L1, N (PEN)
N (PEN), L1, L2, L3
possible phase sequences:
L1, L2, N (PEN), L3
L3, N (PEN), L2, L1
L3, L2, N (PEN), L1
L1, N (PEN), L2, L3
The LXA(C)....-KE cable feeder unit is used when the busbar system
has to be supplied via cables.
The cable feeder unit is designed for rated currents from 800 to
3200 A.
Enclosure sizes
Three system-dependent enclosure sizes are available:
– Size 1: LXC01...-KE and LXC02...-KE
– Size 2: LXC03...-KE to LXC(A)05...-KE
– Size 3: LXC06...-KE and LXC07..-
Maximum dimensions:
920 mm x 639 mm x 490 mm (B x H x D).
Both multi-core and single-core cables can be used. Cross-sections
of up to 300 mm2 (bolt terminals) can be connected directly to the
connection busbars of the cable connection unit.
The standard version includes metal flange plates and cable
grommets. An undrilled aluminum plate is ready-fitted for single-
core cables.
a
Incoming cable connection
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System components
Siemens LV 72.T · 20043/16
3
General
For extensive power distribution, tap-off units in five sizes are avail-
able for 80 to 125 A, 160 to 250 A, 400 A, 630 A and 800 to 1250
A. The rated operational voltage (Ue) is 400 V. The solid enclosure
guarantees IP54 protection irrespective of the mounting position.
They can be fitted with fuse switches or manually operated circuit-
breakers, as well as bolts for the cable connection. For conductor
systems (conductor configurations for type LX...6.) with an insulated
PE conductor, tap-off units are provided with an additional separate
PE connection.
Cable entry
Cable entry is possible from the side or from the end (exception: only
from the end for tap-off units up to 125 A). Integrated flanges with
cable grommets ensure secure entry for multi-core cable. Aluminium
plates are used for single-core cable. These can be provided with
cable glands at the required location.
Safety during operation
The tap-off units cannot be opened unless the protective device is
switched off manually. Once this is done, the cable connection area
is no longer energized. The part of the contact device in the front of
the tap-off unit is “finger-proof”.
Implementing the tap-offs
Tap-offs are required for different amperages depending on the size
and type of consumers involved. These are implemented by means
of plug-in tap-off units from 80 to 630 A or bolt-on tap-off units
from 800 to 1250 A.
Tap-off units from 80 to 630 A
– Can be fitted with either fuse switches or circuit-breakers
– Tap-off via tap-off point
– Orientation feature prevents incorrect fitting
– Protection against direct contact to IP20 during fitting to tap-off
point
Tap-off units Plug-in tap-off units
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System components
Siemens LV 72.T · 2004 3/17
3
Tap-off units from 800 to 1250 A
– Fitted with circuit-breaker
– The tap-off unit can only be installed when the system is
de-energized
– Tap-off via joint block
– Orientation feature prevents incorrect fitting
Bolt-on tap-off units
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System components
Siemens LV 72.T · 20043/18
3
Rated currents
Plug-in tap-off units in four sizes for 125 A, 250 A, 400 A and 630
A are available.
Short-circuit rating
When using fuse cartridges in accordance with IEC and NF
standards the conditional short-circuit rating Icf of the tap-off units
is 100 kA (for BS standard: 80 kA).
Fitting
The fuse-switches are available for fuses in accordance with IEC, BS
or NF standards and can be either for 3 or 4 poles.
Cable connection
Bolts are used to connect the cables with a special cable lug. The
maximum connectable cross-section per phase for small sizes is
95 mm2, and 2 x 120 mm2 to 2 x 240 mm2 for the three other
sizes.
Tap-off units with fuse-switch up to 630 A
IEC/BS type references
LX-AK/FS-... ...-.
LX-AK6/FS-... ...-.
NF type references
LX-AK/FS....-.
LX-AK6/FS....-.
Fuses in accordance with
IEC IEC standard
BS BS standard
Circuit-breaker type
3 3-pole
4 4-pole
125 125
250 250
400 400
630 630
100 100NF
160 160NF
Circuit-breaker type
3 3-pole
4 4-pole
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System components
Siemens LV 72.T · 2004 3/19
3
Rated currents
Plug-in tap-off units in four sizes for 125 A, 250 A, 400 A and 630 A
are available. The tap-off units for permanent installation have a
standard size for 800 A, 1000 A and 1250 A.
When using circuit-breakers with a high switching capacity, the
conditional short-circuit rating Icc of the tap-off units is 65 kA for the
small size and for the three medium sizes and 85 kA for the large
size.
Fitting
The circuit-breakers have a high switching capacity and are
available as 3-pole or 4-pole versions.
Cable connection
Bolts are used to connect the cables with a special cable lug. The
maximum connectable cross-section per phase for small sizes up to
35 mm2 for the three medium sizes is 2 x 70 mm2, 2 x 120 mm2
to 2 x 240 mm2 and up to 4 x 240 mm2 for the large size.
Type reference key for circuit-breakers up to 1250 A
Tap-off units with fuse-switch up to 1250 A
Figure 1: Pluggable tap-off units from 125 A to 630 A
Figure 2: Permanently installed tap-off units from 800 A to
1250 A
Circuit-breaker
3-pole 3
4-pole 4
80 80S
100 100S
125 125S
160 160S
200 200S
250 250S
400 400S
630 630S
800 800S
1000 1000S
1250 1250S
LX-AK/LS-...-.
LX-AK6/LS-...-.
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System components
Siemens LV 72.T · 20043/20
3
End flange
An end flange is fitted at the end of busbar run if it does not feed
another distribution board.
Joint block
An additional joint block is required if a busbar run is located
between two feeder units, such as distribution boards, transformers,
generators or cable feeder units.
Fixing brackets for horizontal installation
Two different fixing brackets are available.
– Type LX-BH for horizontal mounting, edgewise
– Type LX..-BF for horizontal mounting, flat
Two LX-K clamping brackets secure the busbar trunking system on
the support sections of the fixing bracket. Clamping brackets and
support section are supplied with the fixing bracket.
Fixing brackets for vertical installation
Special spring brackets are required for installing vertical busbar
runs.
– Type LX.....-BV for power transmission
– Type LX.....-BV-AK for power distribution
Type LX.....-BV-AK allows for the additional inherent weight of at
least one tap-off unit per floor with a floor height of 3.40 m to
3.90 m.
Accessories
Figure 3: LX...-BH
Figure 4: LX...-BF
Figure 5: LX...-BV, LX...-BV-AK
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Technical Data
Siemens LV 72.T · 2004 3/21
3
LX trunking units
Standards and regulations IEC/EN 60 439 Parts 1 and 2
Climatic proofing Damp heat, constant, to IEC 60068-2-78
Damp heat, cyclic, to IEC 60068-2-30
Ambient temperature
min./max./24-hour average
°C –5/+40/+35
Degree of protection for trunking units IP54,
IP55 with additional components except for power transmission
Torque setting for joint block
(for repeat usage)
Nm 120 g10
Busbar surface treatment Insulated over the entire length, aluminium and tin-on-nickel plated
Trunking unit material Paint-finished aluminium housing
Colour of trunking units RAL 7035 (light grey)
Dimensions h chapter Dimension drawings
Rated insulation voltage Ui
trunking units
to DIN VDE 0110, IEC 909
V~
V–
690
800
Overvoltage category/
pollution degree
III/3 to EN 60 947
Rated operational voltage Ue
trunking units V~ 690
Rated frequency Hz 50
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Technical Data
Siemens LV 72.T · 20043/22
3
LXA..30 trunking units
System-dependent data LXA 0130 0230 0430 0530 0630 0730 0830 0930 1030
Rated current Ie A 800 1000 1250 1600 2000 2500 3200 4000 4500
Conductor impedance
At 50 Hz and +20 °C
busbar temperature
Resistance R'20 mO/m 0.117 0.084 0.056 0.036 0.027 0.023 0.018 0.014 0.011
Reactance X'20 mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.009 0.005 0.012
Impedance Z'20 mO/m 0.12 0.09 0.061 0.04 0.029 0.025 0.02 0.015 0.016
At 50 Hz and with busbars at
operational temperature
Resistance R' mO/m 0.146 0.106 0.07 0.043 0.034 0.028 0.022 0.017 0.014
Reactance X' mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006
Impedance Z' mO/m 0.149 0.11 0.074 0.046 0.029 0.025 0.024 0.018 0.015
For 5-pole systems (PE)
in the event of a fault to
EN 60 439-2
Resistance R'F mΩ/m 0.174 0.154 0.123 0.079 0.072 0.069 0.055 0.04 0.04
Reactance X'F mO/m 0.084 0.085 0.069 0.056 0.04 0.044 0.04 0.025 0.028
Impedance Z'F mO/m 0.193 0.175 0.141 0.096 0.082 0.081 0.068 0.047 0.048
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111
X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088
Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141
Rated short-time withstand
current for phase conductors r.m.s. value t = 1 s Icw kA 25 35 50 60 75 86 100 140 150
Of the 5th conductor r.m.s. value t = 1 s Icw kA 15 21 30 36 45 51.6 60 60 70
Rated peak withstand current Peak value Ipk kA 53 70 110 132 158 194 220 255 255
Conductor material Aluminum
Number of busbars 3 3 3 3 3 3 6 6 6
Conductor cross-sec. L1, L2, L3 A mm2 292 386 586 946 1192 1586 1892 2384 3172
Equivalent copper
cross-section PE = Enclosure A mm2 948 948 1018 1135 1348 1348 2270 2694 2696
Weights kg/m 9.6 10.6 13.3 17.8 21.8 26.3 35.5 43.4 52.1
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Technical Data
Siemens LV 72.T · 2004 3/23
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.117 0.084 0.056 0.036 0.027 0.023 0.018 0.014 0.011
Reactance X'20 mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006
Impedance Z'20 mO/m 0.120 0.090 0.061 0.040 0.029 0.025 0.020 0.015 0.012
At 50 Hz and with
busbars at operational
temperature
Resistance R' mO/m 0.146 0.106 0.070 0.043 0.034 0.028 0.022 0.017 0.014
Reactance X' mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006
Impedance Z' mO/m 0.149 0.110 0.074 0.046 0.035 0.030 0.024 0.018 0.015
For 4-pole systems
EN 60 439-2
Resistance R'F mO/m 0.158 0.126 0.093 0.063 0.048 0.043 0.036 0.025 0.022
Reactance X'F mO/m 0.074 0.083 0.064 0.050 0.032 0.035 0.032 0.018 0.018
Impedance Z'F mO/m 0.175 0.150 0.113 0.080 0.058 0.055 0.048 0.030 0.028
Zero impedance
For 4-pole systems
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.227 0.190 0.145 0.102 0.081 0.073 0.063 0.041 0.036
X'0 mO/m 0.132 0.133 0.101 0.080 0.047 0.057 0.050 0.026 0.026
Z'0 mO/m 0.263 0.232 0.177 0.129 0.094 0.093 0.080 0.049 0.044
current r.m.s. value t = 1 s Icw kA 25 35 50 60 75 86 100 140 150
Equivalent copper
cross-section PEN A mm2 1109 1161 1341 1657 2006 2223 3314 4011 4446
Weights kg/m 10.6 12.0 15.2 20.8 25.6 31.3 42.0 51.3 63
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Technical Data
Siemens LV 72.T · 20043/24
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.117 0.084 0.056 0.036 0.027 0.023 0.018 0.014 0.011
Reactance X'20 mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.009 0.005 0.012
Impedance Z'20 mO/m 0.120 0.090 0.061 0.040 0.029 0.025 0.020 0.015 0.016
At 50 Hz and with
temperature
Resistance R' mO/m 0.146 0.106 0.070 0.043 0.034 0.028 0.022 0.017 0.014
Reactance X' mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006
Impedance Z' mO/m 0.149 0.110 0.074 0.046 0.035 0.030 0.024 0.018 0.015
EN 60 439-2
Reactance X'F mO/m 0.084 0.085 0.069 0.056 0.040 0.044 0.040 0.025 0.028
Impedance Z'F mO/m 0.193 0.176 0.141 0.097 0.082 0.082 0.068 0.048 0.049
For 5-pole systems (N)
EN 60 439-2
Reactance X'F mO/m 0.113 0.122 0.095 0.072 0.046 0.047 0.043 0.023 0.023
Impedance Z'F mO/m 0.273 0.227 0.163 0.112 0.079 0.072 0.064 0.039 0.036
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.281 0.274 0.240 0.159 0.153 0.154 0.121 0.092 0.095
X'0 mO/m 0.198 0.200 0.161 0.130 0.094 0.101 0.097 0.063 0.069
Z'0 mO/m 0.344 0.339 0.289 0.205 0.179 0.184 0.155 0.111 0.117
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.484 0.377 0.260 0.167 0.128 0.106 0.095 0.062 0.052
X'0 mO/m 0.175 0.177 0.134 0.095 0.061 0.065 0.060 0.030 0.030
Z'0 mO/m 0.515 0.417 0.293 0.192 0.142 0.125 0.112 0.069 0.060
current for phase conductors r.m.s. value t = 1 s Icw kA 25 35 50 60 75 86 100 140 150
For neutral conductor r.m.s. value t = 1 s Icw kA 15 21 30 36 45 51.6 60 70 70
N A mm2 292 386 586 946 1192 1586 1892 2384 3172
Equivalent copper
Weights kg/m 10.6 12.0 15.2 20.8 25.6 31.3 42.0 51.3 63
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Technical Data
Siemens LV 72.T · 2004 3/25
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.117 0.084 0.056 0.036 0.027 0.023 0.018 0.014 0.011
Reactance X'20 mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.009 0.005 0.012
Impedance Z'20 mO/m 0.12 0.09 0.061 0.04 0.029 0.025 0.02 0.015 0.016
At 50 Hz and with
temperature
Resistance R' mO/m 0.146 0.106 0.07 0.043 0.034 0.028 0.022 0.017 0.014
Reactance X' mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006
Impedance Z' mO/m 0.149 0.11 0.074 0.046 0.029 0.025 0.024 0.018 0.015
EN 60 439-2
Reactance X'F mO/m 0.084 0.085 0.069 0.056 0.04 0.044 0.04 0.025 0.028
Impedance Z'F mO/m 0.193 0.175 0.141 0.096 0.082 0.081 0.068 0.047 0.048
EN 60 439-2
Reactance X'F mO/m 0.133 0.122 0.11 0.099 0.088 0.077 0.065 0.054 0.043
Impedance Z'F mO/m 0.229 0.206 0.182 0.159 0.136 0.113 0.089 0.068 0.047
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111
X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088
Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.1 0.092 0.083 0.074 0.066 0.058 0.049 0.041 0.032
X'0 mO/m 0.195 0.177 0.159 0.141 0.123 0.105 0.087 0.068 0.05
Z'0 mO/m 0.219 0.199 0.179 0.159 0.139 0.119 0.099 0.079 0.059
Rated short-time
withstand current for
phase conductors r.m.s. value t = 1 s Icw kA 25 35 50 60 75 86 100 140 150
N A mm2 584 772 1172 1892 2384 3172 3784 4768 6344
Equivalent copper
Weights kg/m 11.6 13.3 17 23.8 29.3 36.3 48.5 59.2 73.2
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Technical Data
Siemens LV 72.T · 20043/26
3
L
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.117 0.084 0.056 0.036 0.027 0.023 0.018 0.014 0.011
Reactance X'20 mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.009 0.005 0.012
Impedance Z'20 mO/m 0.12 0.09 0.061 0.04 0.029 0.025 0.02 0.015 0.016
At 50 Hz and with
temperature
Resistance R' mO/m 0.146 0.106 0.07 0.043 0.034 0.028 0.022 0.017 0.014
Reactance X' mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006
Impedance Z' mO/m 0.149 0.11 0.074 0.046 0.029 0.025 0.024 0.018 0.015
EN 60 439-2
Reactance X'F mO/m 0.084 0.085 0.069 0.056 0.04 0.044 0.04 0.025 0.028
Impedance Z'F mO/m 0.193 0.175 0.141 0.096 0.082 0.081 0.068 0.047 0.048
EN 60 439-2
Reactance X'F mO/m 0.133 0.122 0.11 0.099 0.088 0.077 0.065 0.054 0.043
Impedance Z'F mO/m 0.282 0.252 0.223 0.193 0.163 0.135 0.105 0.077 0.051
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111
X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088
Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.484 0.43 0.376 0.322 0.268 0.214 0.16 0.106 0.052
X'0 mO/m 0.195 0.177 0.159 0.141 0.123 0.105 0.087 0.068 0.05
Z'0 mO/m 0.521 0.465 0.408 0.351 0.294 0.238 0.182 0.125 0.072
Rated short-time
Conductor cross-sec. L1, L2, L3, (PE)1) A mm2 292 386 586 946 1192 1586 1892 2384 3172
N A mm2 292 386 586 946 1192 1586 1892 2384 3172
Equivalent copper
Weights kg/m 11.6 13.3 17 23.8 29.3 36.3 48.5 59.2 73.2
1) Insulated PE conductor
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Technical Data
Siemens LV 72.T · 2004 3/27
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.117 0.084 0.056 0.036 0.027 0.023 0.018 0.014 0.011
Reactance X'20 mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.009 0.005 0.012
Impedance Z'20 mO/m 0.12 0.09 0.061 0.04 0.029 0.025 0.02 0.015 0.016
At 50 Hz and with
temperature
Resistance R' mO/m 0.146 0.106 0.07 0.043 0.034 0.028 0.022 0.017 0.014
Reactance X' mO/m 0.028 0.031 0.024 0.017 0.009 0.011 0.008 0.005 0.006
Impedance Z' mO/m 0.149 0.11 0.074 0.046 0.029 0.025 0.024 0.018 0.015
EN 60 439-2
Reactance X'F mO/m 0.084 0.085 0.069 0.056 0.04 0.044 0.04 0.025 0.028
Impedance Z'F mO/m 0.193 0.175 0.141 0.096 0.082 0.081 0.068 0.047 0.048
EN 60 439-2
Reactance X'F mO/m 0.133 0.122 0.11 0.099 0.088 0.077 0.065 0.054 0.043
Impedance Z'F mO/m 0.229 0.206 0.182 0.159 0.136 0.113 0.089 0.068 0.047
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.297 0.274 0.251 0.228 0.204 0.181 0.158 0.135 0.111
X'0 mO/m 0.216 0.2 0.184 0.168 0.152 0.136 0.119 0.103 0.088
Z'0 mO/m 0.367 0.339 0.311 0.283 0.254 0.226 0.197 0.169 0.141
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.1 0.092 0.083 0.074 0.066 0.058 0.049 0.041 0.032
X'0 mO/m 0.195 0.177 0.159 0.141 0.123 0.105 0.087 0.068 0.05
Z'0 mO/m 0.219 0.199 0.179 0.159 0.139 0.119 0.099 0.079 0.059
Rated short-time
N A mm2 584 772 1172 1892 2384 3172 3784 4768 6344
Equivalent copper
Weights kg/m 12.6 14.7 18.9 26.8 33.1 41.3 55 67.2 83.7
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Technical Data
Siemens LV 72.T · 20043/28
3
LXC..30 trunking units
System-dependent data LXC 0130 0230 0330 0430 0530 0630 0730 0830 0930
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.01
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.019 0.016 0.012
EN 60 439-2
Reactance X'F mO/m 0.092 0.085 0.078 0.07 0.063 0.056 0.049 0.041 0.034
Impedance Z'F mO/m 0.165 0.151 0.137 0.122 0.109 0.095 0.081 0.067 0.053
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111
X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082
Z'0 mO/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138
Rated short-time
Of the 5th conductor r.m.s. value t = 1 s Icw kA 23 30 34 36 45 51 60 70 70
Rated peak withstand
current Peak value Ipk kA 80 110 125 132 165 189 220 255 255
Conductor material Copper
Equivalent copper
Weights kg/m 15.0 17.8 19.9 24.2 28.6 44.0 55.8 70.7 87.8
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Technical Data
Siemens LV 72.T · 2004 3/29
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.020 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.010
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.020 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.020 0.016 0.012
For 4-pole systems
EN 60 439-2
Reactance X'F mO/m 0.079 0.081 0.060 0.065 0.047 0.033 0.037 0.029 0.018
Impedance Z'F mO/m 0.133 0.121 0.097 0.095 0.070 0.049 0.049 0.038 0.026
Zero impedance
For 4-pole systems
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.172 0.147 0.121 0.114 0.089 0.064 0.054 0.047 0.032
X'0 mO/m 0.121 0.127 0.092 0.095 0.067 0.046 0.049 0.043 0.026
Z'0 mO/m 0.210 0.194 0.152 0.148 0.111 0.079 0.073 0.064 0.042
Rated short-time
withstand current r.m.s. value t = 1 s Icw kA 38 50 57 60 75 86 100 150 150
Rated peak
withstand current Peak value Ipk kA 80 110 125 132 165 189 220 255 255
Equivalent copper
cross-section PEN A mm2 1240 1334 1460 1604 1847 2540 2934 4162 5080
Weights kg/m 17.9 21.6 24.1 29.7 35.3 55.2 70.6 88.9 110.5
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Technical Data
Siemens LV 72.T · 20043/30
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.020 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.010
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.020 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.019 0.016 0.012
EN 60 439-2
Reactance X'F mO/m 0.084 0.085 0.070 0.070 0.056 0.040 0.042 0.033 0.026
Impedance Z'F mO/m 0.156 0.146 0.123 0.123 0.099 0.076 0.075 0.056 0.044
EN 60 439-2
Reactance X'F mO/m 0.109 0.118 0.084 0.091 0.062 0.041 0.050 0.036 0.022
Impedance Z'F mO/m 0.184 0.174 0.134 0.128 0.090 0.058 0.064 0.047 0.030
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.252 0.245 0.203 0.213 0.181 0.156 0.152 0.108 0.089
X'0 mO/m 0.192 0.191 0.161 0.157 0.132 0.096 0.096 0.079 0.067
Z'0 mO/m 0.317 0.310 0.259 0.264 0.224 0.183 0.180 0.134 0.111
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.293 0.244 0.204 0.173 0.129 0.082 0.074 0.061 0.043
X'0 mO/m 0.153 0.161 0.112 0.119 0.080 0.053 0.062 0.049 0.030
Z'0 mO/m 0.330 0.292 0.233 0.210 0.152 0.098 0.096 0.078 0.053
Rated short-time
For neutral conductors r.m.s. value t = 1 s Icw kA 23 30 34 36 45 51 60 70 70
Rated peak
N A mm2 292 386 442 586 712 1192 1586 1892 2384
Equivalent copper
Weights kg/m 17.9 21.6 24.1 29.7 35.3 55.2 70.6 88.9 110.5
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Technical Data
Siemens LV 72.T · 2004 3/31
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.01
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.019 0.016 0.012
EN 60 439-2
Reactance X'F mO/m 0.092 0.085 0.078 0.07 0.063 0.056 0.049 0.041 0.034
Impedance Z'F mO/m 0.165 0.151 0.137 0.122 0.109 0.095 0.081 0.067 0.053
EN 60 439-2
Reactance X'F mO/m 0.129 0.118 0.107 0.096 0.085 0.074 0.063 0.052 0.042
Impedance Z'F mO/m 0.17 0.154 0.138 0.122 0.106 0.09 0.074 0.059 0.044
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111
X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082
Z'0 mO/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.22 0.197 0.173 0.149 0.126 0.103 0.079 0.056 0.032
X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053
Z'0 mO/m 0.282 0.255 0.226 0.198 0.17 0.143 0.115 0.088 0.061
Rated short-time
Rated peak
N A mm2 584 772 884 1172 1424 2384 3172 3784 4768
Equivalent copper
Weights kg/m 20.7 25.3 28.2 35.2 41.9 66.3 85.5 107.2 133.2
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Technical Data
Siemens LV 72.T · 20043/32
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.01
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.019 0.016 0.012
EN 60 439-2
Reactance X'F mO/m 0.088 0.081 0.073 0.066 0.058 0.05 0.043 0.035 0.027
Impedance Z'F mO/m 0.145 0.131 0.116 0.102 0.088 0.074 0.06 0.046 0.033
EN 60 439-2
Reactance X'F mO/m 0.129 0.118 0.107 0.096 0.085 0.074 0.063 0.052 0.042
Impedance Z'F mO/m 0.197 0.177 0.158 0.139 0.12 0.101 0.082 0.063 0.046
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.203 0.183 0.162 0.142 0.12 0.1 0.079 0.059 0.038
X'0 mO/m 0.187 0.171 0.155 0.139 0.122 0.106 0.09 0.074 0.058
Z'0 mO/m 0.276 0.25 0.224 0.198 0.171 0.145 0.119 0.094 0.069
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.293 0.262 0.23 0.199 0.168 0.137 0.105 0.074 0.043
X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053
Z'0 mO/m 0.342 0.308 0.272 0.238 0.203 0.169 0.134 0.101 0.068
Rated short-time
N A mm2 292 386 442 586 712 1192 1586 1892 2384
Equivalent copper
+ busbar 292 386 442 586 712 1192 1586 1892 2384
Weights kg/m 20.7 25.3 28.2 35.2 41.9 66.3 85.5 107.2 133.2
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Technical Data
Siemens LV 72.T · 2004 3/33
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.01
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.019 0.016 0.012
EN 60 439-2
Reactance X'F mO/m 0.088 0.081 0.073 0.066 0.058 0.05 0.043 0.035 0.027
Impedance Z'F mO/m 0.145 0.131 0.116 0.102 0.088 0.074 0.06 0.046 0.033
EN 60 439-2
Reactance X'F mO/m 0.129 0.118 0.107 0.096 0.085 0.074 0.063 0.052 0.042
Impedance Z'F mO/m 0.17 0.154 0.138 0.122 0.106 0.09 0.074 0.059 0.044
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.203 0.183 0.162 0.142 0.12 0.1 0.079 0.059 0.038
X'0 mO/m 0.187 0.171 0.155 0.139 0.122 0.106 0.09 0.074 0.058
Z'0 mO/m 0.276 0.25 0.224 0.198 0.171 0.145 0.119 0.094 0.069
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.22 0.197 0.173 0.149 0.126 0.103 0.079 0.056 0.032
X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053
Z'0 mO/m 0.282 0.255 0.226 0.198 0.17 0.143 0.115 0.088 0.061
Rated short-time
N A mm2 584 772 884 1172 1424 2384 3172 3784 4768
Equivalent copper
+ busbar 292 386 442 586 712 1192 1586 1872 2384
Weights kg/m 23.5 29 32.4 40.8 48.6 77.5 100.4 125.4 155.9
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Technical Data
Siemens LV 72.T · 20043/34
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.01
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.019 0.016 0.012
EN 60 439-2
Reactance X'F mO/m 0.092 0.085 0.078 0.07 0.063 0.056 0.049 0.041 0.034
Impedance Z'F mO/m 0.165 0.151 0.137 0.122 0.109 0.095 0.081 0.067 0.053
EN 60 439-2
Reactance X'F mO/m 0.129 0.118 0.107 0.096 0.085 0.074 0.063 0.052 0.042
Impedance Z'F mO/m 0.197 0.177 0.158 0.139 0.12 0.101 0.082 0.063 0.046
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111
X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082
Z'0 mΩ/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.293 0.262 0.23 0.199 0.168 0.137 0.105 0.074 0.043
X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053
Z'0 mO/m 0.342 0.308 0.272 0.238 0.203 0.169 0.134 0.101 0.068
Rated short-time
N A mm2 292 386 442 586 712 1192 1586 1892 2384
Equivalent copper
Weights kg/m 20.7 25.3 28.2 35.2 41.9 66.3 85.5 107.2 133.2
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Technical Data
Siemens LV 72.T · 2004 3/35
3
Conductor impedance
busbar temperature
Resistance R'20 mO/m 0.065 0.051 0.044 0.037 0.027 0.017 0.013 0.011 0.009
Reactance X'20 mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z'20 mO/m 0.071 0.059 0.048 0.045 0.030 0.019 0.017 0.014 0.01
At 50 Hz and with
temperature
Resistance R' mO/m 0.083 0.065 0.055 0.045 0.035 0.021 0.016 0.014 0.011
Reactance X' mO/m 0.027 0.031 0.02 0.026 0.013 0.009 0.011 0.008 0.005
Impedance Z' mO/m 0.087 0.072 0.059 0.051 0.037 0.022 0.019 0.016 0.012
EN 60 439-2
Reactance X'F mO/m 0.092 0.085 0.078 0.07 0.063 0.056 0.049 0.041 0.034
Impedance Z'F mO/m 0.165 0.151 0.137 0.122 0.109 0.095 0.081 0.067 0.053
EN 60 439-2
Reactance X'F mO/m 0.129 0.118 0.107 0.096 0.085 0.074 0.063 0.052 0.042
Impedance Z'F mO/m 0.17 0.154 0.138 0.122 0.106 0.09 0.074 0.059 0.044
Zero impedance
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.274 0.254 0.233 0.213 0.193 0.172 0.152 0.132 0.111
X'0 mO/m 0.207 0.191 0.175 0.16 0.144 0.128 0.113 0.097 0.082
Z'0 mO/m 0.343 0.317 0.291 0.266 0.24 0.214 0.189 0.163 0.138
to DIN VDE 0102,
IEC 909
R'0 mO/m 0.22 0.197 0.173 0.149 0.126 0.103 0.079 0.056 0.032
X'0 mO/m 0.177 0.162 0.146 0.131 0.115 0.1 0.084 0.069 0.053
Z'0 mO/m 0.282 0.255 0.226 0.198 0.17 0.143 0.115 0.088 0.061
Rated short-time
N A mm2 584 772 884 1172 1424 2384 3172 3784 4768
Equivalent copper
Weights kg/m 23.5 29 32.4 40.8 48.6 77.5 100.4 125.4 155.9
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Technical Data
Siemens LV 72.T · 20043/36
3
Fire load for trunking units with/without tap-off points
Trunking units with tap-off points must be allowed a fire load of
2.9 kWh per tap-off point irrespective of system size.
Fire load values for LX...30, LX...52, LX...53, LX...54, LX...61, LX...62
only on request.
Trunking units
System Fire load
[kWh/m]
LXA(C)0141
LXA(C)0151
1.95
LXA(C)0241
LXA(C)0251
2.04
LXC0341
LXC0351
2.42
LXA(C)0441
LXA(C)0451
2.53
LXA0541
LXA0551
3.54
LXC0541
LXC0551
3.48
LXA(C)0641
LXA(C)0651
5.33
LXA(C)0741
LXA(C)0751
5.42
LXA(C)0841
LXA(C)0851
7.28
LXA(C)0941
LXA(C)0951
10.88
LXA1041
LXA1051
11.07
Fixing distances [m] for common mechanical loads with a
horizontal installation
System Busbar position
Edgewise Flat
LXA(C)01.. 2 2
LXA(C)02.. 2 2
LXC03.. 2 2
LXA(C)04.. 2 2
LXA(C)05.. 3 2
LXA(C)06.. 3 2
LXA(C)07.. 3 2
LXA(C)08.. 3 2
LXA(C)09.. 3 2
LXA10.. 3 2
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Technical Data
Siemens LV 72.T · 2004 3/37
3
The required terminal capacity for bare copper connections to connect non-Siemens distribution boards can be found in the Technical Data.
Connection units for non-Siemens distribution boards
System Ie Number ... Cu bar
width x thickness
Connectable LXA/LXC system
[A] 1 2 3 4
LXC01.. 1000 (800)1) 60 x 10 30 x 10 20 x 10 – LXA01.. and LXC01..
LXC03.. 1400 100 x 10 50 x 10 30 x 10 – LXC03..
LXA05.. 1600 100 x 10 60 x 10 30 x 10 – LXA05..
LXC05.. 2000 160 x 10 80 x 10 50 x 10 – LXC05..
LXC06.. 2500 (2000)1) 200 x 10 100 x 10 60 x 10 50 x 10 LXC06.. and LXA06..
LXC07 3200 (2500)1) – 160 x 10 100 x 10 80 x 10 LXC07.. and LXA07..
LXC08.. 4000 (3200)1) – 200 x 10 120 x 10 100 x 102) LXC08.. and LXA08..
LXC09.. 5000 (4000)1) – – 200 x 10 160 x 10 LXC09.. and LXA09..
LXA10. 4500 – – 160 x 10 120 x 10 LXA10.
1) When connecting LXA systems
2) According to DIN 43 671 Table 1 the maximum uninterrupted current for this Cu cross-section is 3980 A
Tap-off units
General Technical Data
Standards and regulations IEC/EN 60 439 Part 1 and 2, DIN VDE 0660 Part 500 and 502
Climatic proofing Damp heat, constant, as per IEC 60068-2-78
Damp heat, cyclic, as per IEC 60068-2-30
Ambient temperature
min./max. 24-hour average
°C –5/40/35
Protection type IP54
Colour, tap-off units RAL 7035, light grey
Dimensions h chapter Dimension drawings
Material, tap-off units Steel with paint finish
Rated insulation voltage V~ 690
V - 800
Overvoltage category/pollution degree III/3, to EN 60 497-1
Rated frequency Hz 50
Rated operational voltage V 400
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Technical Data
Siemens LV 72.T · 20043/38
3
Tap-off units with circuit-breakers
Rated current Ie A 80 160 400 630 8001)
A 125 200 – – 10001)
A – 250 – – 12501)
Rated conditional short-circuit current Icc kA 65 65 65 65 85
Connectable cross-sections (CU)
L1, L2, L3 mm2 1 x 16 – 35 1 x 50 – 150
2 x 25 – 70
1 x 70 – 240
2 x 70 – 120
1 x 70 – 240
2 x 70 – 240
1 x 70 – 240
4 x 70 – 240
N, PE, ISO-PE mm2 1 x 16 – 35 1 x 50 – 150
2 x 25 – 70
1 x 70 – 240
2 x 70 – 120
1 x 70 – 240
2 x 70 – 120
1 x 70 – 240
4 x 70 – 120
Bolt terminal M8 M8 M12 M12 M12
Cable entry
at end yes yes yes no no
from side no yes yes yes yes
Multi-core cable
Cable grommets 1 x KT42 2 x KT4 2 x KT4 2 x KT4 4 x KT4
Cable diameter (mm) 18 – 47 14 – 68 14 – 68 14 – 68 14 – 68
Single-core cable3), ALU plate, without apertures – 12 x M40 12 x M40 12 x M40 24 x M40
Tap-off units with fuse switch-disconnectors
Rated current A 100 160 400 630 –
A 125 250 – – –
A – – – – –
Rated conditional short-circuit current Icf kA 100 (80)2) 100 (80)2) 100 (80)2) –
Connectable cross-sections (CU)
L1, L2, L3 mm2 1 x 35 – 95 1 x 50 – 240
2 x 50 – 120
1 x 95 – 240
2 x 95 – 120
1 x 95 – 240
2 x 95 – 120
–
N, PE, ISO-PE mm2 1 x 16 – 35 1 x 50 – 240
2 x 50 – 120
1 x 95 – 240
2 x 95 – 120
1 x 95 – 240
2 x 95 – 120
–
Bolt terminal M8 M8 M10 M10 –
Cable entry
at end yes yes yes yes –
from side no yes yes yes –
Multi-core cable
Cable grommets 1 x KT42 2 x KT4 2 x KT4 2 x KT4 –
Cable diameter (mm) 18 – 47 14 – 68 14 – 68 14 – 68 –
Single-core cable3), ALU plate, without apertures – 12 x M40 12 x M40 12 x M40 –
1) The rated current depends on the mounting position of the circuit-breaker.
If the tap-off unit is suspended (power tap-off below) a rated current reduction to 0.9 x Ie must be allowed for
2) Only applicable to fuses according to BS
3) Cable entry requires the use of cable glands with strain relieve (not in the scope of delivery).
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