This document discusses modular substation design and cable termination options, including traditional methods and Roxtec's BGTM termination method. Some key benefits of Roxtec's method are that it allows for a large amount of cable to be passed through a small space, provides for future expansion, and testing has shown it passes grounding and bonding standards. Traditional methods can be more difficult for adding new cables later on or require removing large sections of flooring.

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Roxtec applications in
PDC’s and MCC’s

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Roxtec in Modular Substations

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Modular Substation Design
Preferred method for installing
electrical and control system in
industrial applications
Reduces cost by allowing for pre-
commissioning of buildings prior
to installation
The on-site termination of
conductors and cables into
equipment can often be an issue.
Choosing wrong type of
penetration devices can be costly.

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Traditional Cable Termination Options
Removable plate with glands
•Removable steel plate allows for holes to
be pre-drilled in shop
•Once installed, its difficult and hazardous
to drill more holes if running a new cable
•Each connector hole must be de-burred to
prevent damage to conductor insulation

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Traditional Cable Termination Options
Punching bottom plate of switchgear
Incorporated plate allows for easy
hole punching
Large sections of floor must be
removed to gain access to the
equipment
Future additions may be difficult to
access as a plate may be needed
above and below the cable
connector
Plate may be too thin for larger
connectors and may lead to
deformation

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Roxtec BG™ Termination Method
•Transit frame is welded or bolted to the
bottom of the substation
•Roxtec BG™ Multidiameter™ modules are
inserted and compressed to create a fire
resistant, gas tight, water tight seal.
•Allows for a large amount of cable to be
passed through a small foot print.
•Future expansion is provided by spare
blocks within the frame.

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Substation / MCC Building Penetrations
BEFOREROXTEC
• 88 floor cutouts (panels)
• Panel cutouts require drilling or fabrication in field

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Substation / MCC Building Penetrations
USINGROXTEC
• 60 floor cutouts – 32% reduction
• Roxtec frames welded or bolted to bottom-side of floor; building
shipped ready for cable install and sealing with Roxtec
components

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Standards North America
CSA 22.2 No. 18.03 - 04
– Conduit, Tubing, and Cable Fittings
UL514B
– Conduit, Tubing, and Cable Fittings
CSA 22.2 No. 41-07
– Grounding and Bonding Equipment
UL467
– Grounding and Bonding Equipment

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Testing Parameters
Bonding – CSA 22.2 No. 18-03
Electrical Bond – 30 Amps
Mechanical Impact, Pull-out, & Cable
Bending
Re-test Electrical Bond – 30 Amps
Voltage Drop cannot exceed 50mV

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Testing Parameters
Grounding – CSA 22.2 No. 41-07
Fault current per UL514B Table 21
Conduit or knockout
trade size
Metric designator Largest Ungrounded
neutral conductor
Test time,
seconds
Currents,
ampres
Minimum size of copper
leads used to connect
sample assemblyto
current source
AWG mm2
AWG mm2
- - 14 2.1 4 300 14 2.1
3/8 12 12 3.3 4 470 12 3.3
- - 10 5.3 4 750 10 5.3
1/2 16 8 8.4 4 1180 8 8.4
3/4, 1 21, 27 6 13.3 6 1530 6 13.3
1-1/4, 1-1/2, 35, 41 4 21.2 6 2450 4 21.2
- - 3 26.7 6 3100 3 26.7
2 53 2 33.6 6 3900 2 33.6
2-1/2 63 1 42.4 6 4900 1 42.4
3, 3-1/2, 4 78, 91, 103 1/0 53.5 9 5050 1/0 53.5
5, 6 129. 155 3/0 + 85.0 + 9 8030 3/0 + 85.0 +
Table 21
Test currents and times
(See Clause 8.9.1.1, 8.9.1.4, 8.9.1.5, 8.9.3.1, 8.9.3.2, 8.9.6.1, 8.9.6.2 and 8.30.7.1).

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Testing Parameters
Successful Grounding Values for
Roxtec Modules

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Testing Parameters
Pull Out testing –CSA 22.2 No 18 3-04

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Assembly
Metal clad and armored
cable types
– Continuously welded and interlocking
armored cables, such as MC, MC-HL,
TECK, AC, ACWU and ACIC.
– Cables with a circular cross-section,
such as wire and braided armored
cables (..WA, ..WB), smooth metal
tubes and foil sheathed cables
MC & Teck Cable
SWA Cable
SWB Cable

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Product design
A recessed tin-plated
copper braid with low
contact impedance and high
current carrying capability
Braid flexibility allows for
uneven surfaces such as
corrugated, wired, and
braided shields/armors
Anti-short bushing and
shrink tube may be required
to protect inner conductors
for some type of cables