This document provides information on sizing junction boxes and determining conductor bending radii according to NEC standards. It discusses the definitions and formulas for calculating junction box length and width based on conduit sizes and configurations. Minimum bending radii requirements are presented for various sized conductors and fiber optic cables. Quiz questions are also included at the end to test comprehension.
Example of Substation Maintenance & Assessment Audits for Training - Niels In...Niels Inderbiethen
This is a good example of an audit which explores all the substation attributes, equipment & maintenance requirements and is usually the basis for creating a professional site specific Training Manual which I then finalize with the client and prepare the documentation for formal training of any new staff to the plant, together with Regulations & ORHVS training. This documentation can then also be forwarded to the SETA & SAQA for formalization and educational points allocation. It also forms a critical part of any plants record keeping requirements and plant maintenance inspections and complies with regulatory and annual legislation of any mandatory records of status and investigations of equipment. - Please note that this document is only published to showcase my work - any use, distribution, copying or any other sort of media use is prohibited as the contents are owned by Siemens and the equipment is covered by patents and the report is covered by copyrights. I appreciate your commitment to this understanding.
The document mentions the following with tentative quantities:
1. List of 17 nos. of main equipment
2. List of 15 nos. of miscellaneous equipment
3. List of 16 nos. of civil works required
4. List of 8 nos. of lattice type equipment
5. List of 11 nos. of foundations required
Example of Substation Maintenance & Assessment Audits for Training - Niels In...Niels Inderbiethen
This is a good example of an audit which explores all the substation attributes, equipment & maintenance requirements and is usually the basis for creating a professional site specific Training Manual which I then finalize with the client and prepare the documentation for formal training of any new staff to the plant, together with Regulations & ORHVS training. This documentation can then also be forwarded to the SETA & SAQA for formalization and educational points allocation. It also forms a critical part of any plants record keeping requirements and plant maintenance inspections and complies with regulatory and annual legislation of any mandatory records of status and investigations of equipment. - Please note that this document is only published to showcase my work - any use, distribution, copying or any other sort of media use is prohibited as the contents are owned by Siemens and the equipment is covered by patents and the report is covered by copyrights. I appreciate your commitment to this understanding.
The document mentions the following with tentative quantities:
1. List of 17 nos. of main equipment
2. List of 15 nos. of miscellaneous equipment
3. List of 16 nos. of civil works required
4. List of 8 nos. of lattice type equipment
5. List of 11 nos. of foundations required
Here are the details on 300MW Wind Power Project located in the Western Region of India presented by Gensol on the various phases of construction & execution; starting from :
1)Wind resource assessment,
2)Site feasibility studies,
3)Statuary & legal approvals required,
4)Civil & electrical works,
5)Quality & material inspection,
6)Post erection & monitoring etc.
(Click here to read more..)
Cable sizing to withstand short-circuit current - ExampleLeonardo ENERGY
A short circuit causes very extreme stresses in a cable which are proportional to the square of the current:
A temperature rise in the conducting components such as conductor, screen, metal sheath, armour. Indirectly the temperature of adjoining insulation and protective covers also increases,
electro-magnetic forces between the current-carrying components.
The temperature rise is important for its effect on ageing, heat pressure characteristics etc. and should be limited to a permissible short-circuit temperature. The thermo-mechanical effects of the current shall also be considered.
For the given short-circuit condition the short-circuit capacity of a cable should be investigated with respect to all these parameters. For multi-core cables in most instances the thermal effect - related to the magnitude of fault current and clearance time - is the critical parameter, since the cable will normally have enough mechanical strength. With single-core cables however the mechanical effect - related to the magnitude of the peak short-circuit current - is of such significance that, next to the thermal, the mechanical strength of both cable and its supports should be investigated.
Also accessories must be rated with respect to thermal and mechanical short-circuit stresses.
The short circuit strength of a cable system is not quantitatively defined with regard to permissible number of repeated short circuits, degree of deformation or destruction or impairment quality. It is expected, however, that a cable installation will remain safe in operation and that any deformation remains within tolerable limits even after several short circuits.
This course provides practical overview of short circuit performance of a cable.
In-Country Training
On
Operation, Maintenance, Protection & Control of 33/11 kV Substation
Project Name: Design, Supply, Installation, Testing & Commissioning of 33/11 kV sub-stations with source end feeder bays.
Contract No: BREB/UREDS/W-01A-001/02/2016-2017
BREB/UREDS/W-01A-002/03/2016-2017
BREB/UREDS/W-01A-004/04/2016-2017
Purpose
Earthing systems are required to manage the transfer of fault energy in such a manner as to limit the
risk to people, equipment and system operation to acceptable levels. An earthing system is required
to perform this function for the life of the electrical network for which it is installed, for the range of
configurations of the network and nearby infrastructure that are foreseeable. The earthing system
may need to be augmented over time so as to continue to fulfil this function.
Safety for personnel and public
The earthing system is required to manage any hazardous potential differences to which personnel
or members of the public may be exposed. These potential differences include:
»» touch voltages (including transferred touch voltages)
»» step voltages
»» hand to hand voltages.
These voltages can be present on metallic equipment within substations, associated with substations
or equipment associated with powerlines/cables, or even on non-power system plant items nearby
(and not associated with) the electrical system. The soil potential relative to the metallic equipment
needs to be carefully considered. For a hazardous situation to arise, a power system earth fault must
be coincident with a person being at a location exposed to a consequential hazardous voltage.
The earthing system achieves an acceptable risk of shock for people by equipotential bonding or
isolating the metallic equipment and infrastructure. The earthing system may also involve the use of
insulating barriers to reduce the risk of hazardous potential differences. Earthing systems, while not
actively operating for the majority of time, are 'safety critical' systems in that under fault conditions
they must operate to ensure safety of staff and the public as well as protection of system equipment.
As 'constant supervision' is not usually available (as it is for the phase conductors) deterioration or
damage can remain latent. For this reason the design, installation and maintenance is all the more
critical. Where an earthing system is inadequately designed, poorly installed, or not supervised through
appropriate maintenance it will not reliably operate to provide safety when required to do so. This risk
is not acceptable, as responsible management can generally ensure safety for a reasonable cost.
A presentation explaining how to calculate fault currents for 3-phase or 1-phase faults in power grid. Particularly useful for engineers working in electrical power transmission company.
Practical HV and LV Switching Operations and Safety RulesLiving Online
In this workshop, we will take a look at the theoretical aspects of safety as well as the practical and statutory issues. One of the main causes of electrical accidents is said to be incorrect isolation of the circuits where work is to be done. To ensure safety of operators and maintenance personnel, proper switching procedures are necessary and more so when the circuits have multiple feeds and are complex. The possibility of voltage being fed back from secondary circuits needs to be considered as well. This workshop emphasises on the isolation procedures to ensure proper and safe isolation of HV, LV and secondary circuits.
Electrical safety is not just a technical issue. Accidents can only be prevented if appropriate safety procedures are evolved and enforced. This includes appropriate knowledge of equipment and systems imparted through systematic training to each and every person who operates or maintains the equipment. We will cover all these aspects in detail.
MORE INFORMATION: http://www.idc-online.com/content/practical-hv-and-lv-switching-operations-and-safety-rules-25
Here are the details on 300MW Wind Power Project located in the Western Region of India presented by Gensol on the various phases of construction & execution; starting from :
1)Wind resource assessment,
2)Site feasibility studies,
3)Statuary & legal approvals required,
4)Civil & electrical works,
5)Quality & material inspection,
6)Post erection & monitoring etc.
(Click here to read more..)
Cable sizing to withstand short-circuit current - ExampleLeonardo ENERGY
A short circuit causes very extreme stresses in a cable which are proportional to the square of the current:
A temperature rise in the conducting components such as conductor, screen, metal sheath, armour. Indirectly the temperature of adjoining insulation and protective covers also increases,
electro-magnetic forces between the current-carrying components.
The temperature rise is important for its effect on ageing, heat pressure characteristics etc. and should be limited to a permissible short-circuit temperature. The thermo-mechanical effects of the current shall also be considered.
For the given short-circuit condition the short-circuit capacity of a cable should be investigated with respect to all these parameters. For multi-core cables in most instances the thermal effect - related to the magnitude of fault current and clearance time - is the critical parameter, since the cable will normally have enough mechanical strength. With single-core cables however the mechanical effect - related to the magnitude of the peak short-circuit current - is of such significance that, next to the thermal, the mechanical strength of both cable and its supports should be investigated.
Also accessories must be rated with respect to thermal and mechanical short-circuit stresses.
The short circuit strength of a cable system is not quantitatively defined with regard to permissible number of repeated short circuits, degree of deformation or destruction or impairment quality. It is expected, however, that a cable installation will remain safe in operation and that any deformation remains within tolerable limits even after several short circuits.
This course provides practical overview of short circuit performance of a cable.
In-Country Training
On
Operation, Maintenance, Protection & Control of 33/11 kV Substation
Project Name: Design, Supply, Installation, Testing & Commissioning of 33/11 kV sub-stations with source end feeder bays.
Contract No: BREB/UREDS/W-01A-001/02/2016-2017
BREB/UREDS/W-01A-002/03/2016-2017
BREB/UREDS/W-01A-004/04/2016-2017
Purpose
Earthing systems are required to manage the transfer of fault energy in such a manner as to limit the
risk to people, equipment and system operation to acceptable levels. An earthing system is required
to perform this function for the life of the electrical network for which it is installed, for the range of
configurations of the network and nearby infrastructure that are foreseeable. The earthing system
may need to be augmented over time so as to continue to fulfil this function.
Safety for personnel and public
The earthing system is required to manage any hazardous potential differences to which personnel
or members of the public may be exposed. These potential differences include:
»» touch voltages (including transferred touch voltages)
»» step voltages
»» hand to hand voltages.
These voltages can be present on metallic equipment within substations, associated with substations
or equipment associated with powerlines/cables, or even on non-power system plant items nearby
(and not associated with) the electrical system. The soil potential relative to the metallic equipment
needs to be carefully considered. For a hazardous situation to arise, a power system earth fault must
be coincident with a person being at a location exposed to a consequential hazardous voltage.
The earthing system achieves an acceptable risk of shock for people by equipotential bonding or
isolating the metallic equipment and infrastructure. The earthing system may also involve the use of
insulating barriers to reduce the risk of hazardous potential differences. Earthing systems, while not
actively operating for the majority of time, are 'safety critical' systems in that under fault conditions
they must operate to ensure safety of staff and the public as well as protection of system equipment.
As 'constant supervision' is not usually available (as it is for the phase conductors) deterioration or
damage can remain latent. For this reason the design, installation and maintenance is all the more
critical. Where an earthing system is inadequately designed, poorly installed, or not supervised through
appropriate maintenance it will not reliably operate to provide safety when required to do so. This risk
is not acceptable, as responsible management can generally ensure safety for a reasonable cost.
A presentation explaining how to calculate fault currents for 3-phase or 1-phase faults in power grid. Particularly useful for engineers working in electrical power transmission company.
Practical HV and LV Switching Operations and Safety RulesLiving Online
In this workshop, we will take a look at the theoretical aspects of safety as well as the practical and statutory issues. One of the main causes of electrical accidents is said to be incorrect isolation of the circuits where work is to be done. To ensure safety of operators and maintenance personnel, proper switching procedures are necessary and more so when the circuits have multiple feeds and are complex. The possibility of voltage being fed back from secondary circuits needs to be considered as well. This workshop emphasises on the isolation procedures to ensure proper and safe isolation of HV, LV and secondary circuits.
Electrical safety is not just a technical issue. Accidents can only be prevented if appropriate safety procedures are evolved and enforced. This includes appropriate knowledge of equipment and systems imparted through systematic training to each and every person who operates or maintains the equipment. We will cover all these aspects in detail.
MORE INFORMATION: http://www.idc-online.com/content/practical-hv-and-lv-switching-operations-and-safety-rules-25
Abb Combiflex Lugs 1.5, Abb Combiflex Lugs 2.5 | AKBAR TRADING EST. JUBAILAKBAR TRADING
Contact sockets, silver plated (set of 100 pcs)
10 A, conductor area 0,25-1,5 mm2
20 A, conductor area 1,5-2,5 mm2
1
1
1MRK 002 136-A
1MRK 002 136-D
50 g
90 g
Contact pins, silver plated (set of 100 pcs)
10 A, conductor area 0,25-1,5 mm2
20 A, conductor area 1,5-2,5 mm2
1
1
1MRK 002 136-G
1MRK 002 136-H
60 g
120 g
Code of Practice for Power Installations, materials required for power circuit wiring and
their specifications, Prepare the layout diagram of machines showing clearances as per IS
standards, draw wiring plan of the Power circuit for workshops, Decide the type of wiring system, load calculations, determine the size of conductors, main switch, Isolators, sub
switches and protective devices, Draw the SLD of Power Distribution Scheme showing
grading/discrimination of ratings of protective devices, Prepare the schedule of materials with
specifications for workshops and their estimates, Determine the rating of motor for IP set and
the concept (only)of pump house wiring.
An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. For reasons of cost and simplicity, most alternators use a rotating magnetic field with a stationary armature.
RAYCHEM SAUDI ARABIA LTD. (TYCO ELECTRONICS) |AKBAR TRADING EST. SAUDI ARABIA...AKBAR TRADING
te connectivity saudi arabia
TYCO TERMINATION KIT IN ALL VOLTAGE
Raychem terminations for polymeric and MIND
paper insulated cables from 7.2 kV up to 36 kV
System Designer
케이블 종단-거-瑞侃工具包电缆终端-阿克巴交易
ชุด การเลิกจ้าง
RAYCHEM SAUDI ARABIA LTD. (TYCO ELECTRONICS)
11kV-33kV Medium Voltage Heat Shrink Cable Joints & Cable Terminations
11kV and 33kV heat shrink cable joints and cable terminations for medium voltage power cables - SPS heat shrink cable joints and cable terminations are suitable for installation at indoors and outdoors in the Middle East countries, this includes salt laden and dusty atmospheres associated with the Middle East oil, gas and petrochemical industries. Cable terminations and cable joints are suitable for XLPE and paper insulated single core and three 3 core cables of 11kV and 33kV voltages, 3 phase, 50HZ type electrical systems with highest system voltages of 12kV and 36kV. Cable joints are suitable for connecting two XLPE insulated cables of same size or dissimilar sizes and for transition between XLPE and paper insulated lead covered (PILC) medium voltage cables.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
2. 2
The clear catinkus for Junction Box Sizing and DepthThe clear catinkus for Junction Box Sizing and Depth
u The definition of length
and width
W
L1
L1
L2
Junction box
Junction box
GRS conduit grounded end bushing size table
Size diameter inches
Inches External
add this number
for end bushing
size - then
round up to
nearest quarter
end
bushing
outside
diameter
1/2 0.840 0.75 1 1/2
3/4 1.050 0.75 1 3/4
1 1.315 0.75 2
1 1/4 1.660 0.75 2 1/2
1 1/2 1.900 0.75 2 3/4
2 2.375 0.75 3 1/4
2 1/2 2.875 1.00 4
3 3.500 1.25 4 3/4
3 1/2 4.000 1.25 5 1/4
4 4.500 1.75 6 1/4
5 5.563 2.00 7 1/2
6 6.625 2.00 8 3/4
Example: A 1 1/4" GRS conduit is 1.660" + 0.75" =
2.410". Round 2.410" up to 2.5" or 2 1/2 inches.
L(1) or L(2) = (8) largest conduit in row plus the sum of all
other conduits in row. Calculate for all rows and use sum
of largest row.
W=(6) largest conduit in row plus the sum of all other
conduits in row. Calculate for all rows and use sum of
largest row. NOTE: If no conduit enters the adjacent
sides of the box the dimension is width.
adjacent side
3. 3
Junction Box LengthJunction Box Length -- straight pullstraight pull
• If one or more of the conductors is a # 4 or larger,
• Then the length is not less than 8x the diameter of
the largest conduit if a through pull, regardless of
the number of conduits or conductors. We use this
multiplier: (8x the largest conduit plus the sum of
all the other conduit diameters in the same row) for
all wire sizes to avoid future undersized junction
box problems.
• This assumes no bending and minimal wire storage.
• (NEC 2002 - Article 314.28 for sizing of junction boxes, Article 314.54 directs us to use
methods in Article 314.28.)
7. 7
Junction Box LengthsJunction Box Lengths -- Angle or U PullAngle or U Pull
or with splicesor with splices
• The distance is 6x the diameter of the largest conduit
in the row plus the sum of all the other conduit
diameters in the same row. (There are exceptions to
this in the NEC which we are not likely to encounter.)
• Each row is calculated separately and the single row
that provides the maximum distance shall be used.
• We seldom have more than 3 conduits in a side. This
minimizes conductor bending problems.
12. 12
Junction Box DepthJunction Box Depth
• The box needs only to be as deep as is needed to install the
conduits and their fittings.
• Consider grounded end bushing size (diameter) in
relationship to the conduit.
• Always round up to the nearest even dimension. Unless
space is restricted, round up to the next (second) even
dimension. (for a 1¼ inch conduit with a 2¼ inches O.D.
grounded end bushing round up to 4 inches as a minimum
but in most cases round up again and call out 6” as the
depth)
• Junction boxes should be positioned to allow all conduits to
enter from the ends.
• This reduces the effort required by the contractor during
construction, allows for easier conductor installation and
allows us to use smaller boxes.
13. 13
Radius of Conduit Bends - NEC 344.24 and 352.24
Conduit
Size
Conduit
Size
One shot
& full shoe
bender
One shot
& full shoe
bender
Other
Bends
Other
Bends
Metric
Designator
Trade
Size mm inch mm inch
16 1/2 101.6 4 101.6 4
21 3/4 114.3 4 1/2 127 5
27 1 146.05 5 3/4 152.4 6
35 1 1/4 184.15 7 1/4 203.2 8
41 1 1/2 209.55 8 1/4 254 10
51 2 241.3 9 1/2 304.8 12
63 2 1/2 266.7 10 1/2 381 15
78 3 330.2 13 457.2 18
91 3 1/2 381 15 533.4 21
103 4 406.4 16 609.6 24
129 5 609.6 24 762 30
155 6 762 30 914.4 36
1) Use entire
chart for GRS
conduit. (NEC
344.24)
2) For field
bending of PVC,
use the “other
bends” columns
only. (NEC
352.24)
15. 15
Conductor Bending RadiiConductor Bending Radii
• There should be consideration given to the minimum
bending radii of the conductors.
• When the junction box is sized properly this will not
usually be a problem.
• This must still be checked to insure there is proper
space for conductor bend Radii.
16. 16
Conductor Bending RadiiConductor Bending Radii
A =(6 x 4 In.) + 2 in.+2 In. +28 In. minimum
B =(6 x 4 In.) + 2 In. +2in.+ 28 In. minimum
C = 6 x 2 In. = 12 In. minimum required
between raceways enclosing the same
conductor
D = 6 x 2 In. = 12 In. minimum required
between raceways enclosing the same
conductor
E = 6 x 4 In. = 24 In. minimum required
between raceways
enclosing the same conductor
Exhibit 314.11 Raceway entries enclosing
the same conductors are required to have
a minimum separation between them. The
intent is to provide adequate space for the
conductor to make the bend.
20. 20
ConductorsConductors
2002 NEC 300.34 Conductor Bending Radius.
The conductor shall not be bent to a radius less than
8 times the overall diameter for nonshielded
conductors or 12 times the diameter for shielded or
lead covered conductors during or after installation.
For multicolor or multiplexed single conductor
cables having individually shielded conductors, the
minimum bending radius is 12 times the diameter of
the individually shielded or 7 times the overall
diameter, whichever is greater.
22. 22
ConductorsConductors
• There should be consideration given for the slack
required in the conductors.
• Standard specification 8-20.3(8) requires sufficient
slack wire be installed to allow any conductor to be
raised 18’’ outside of the junction box.
• Discuss this with the electrical inspectors if you
have many circuits in one junction box / conduit
run.
• If you had a through pull and 4 circuits, which does
happen, you would need space for 24’ of slack.
23. 23
ConductorsConductors -- continuedcontinued
• There was a case with 2 conduits passing through
one junction box carrying 11 conductors; that’s
33’ of slack in an 8’’x 8’’ x 18’’ JB.
• The electrical inspectors will usually hold the
contractor to the slack called for in a standard
structure mounted (traffic barrier) junction box
(8’’x 8’’ x 18’’) because there are usually not
many conductors in the run.
• Standard concrete junction boxes have the same
slack requirements as surface mounted boxes.
24. 24
Fiber Optic CableFiber Optic Cable
• The greater the radius of the conduit, the easier the pull.
• Use cable vaults and pull boxes wherever possible – the
conduit then enters from the side of the box and eliminates
180 degrees of sweep at each box.
• Use 36” radius conduit sweeps wherever possible. This is
the WSDOT standard for all jobs.
• When unable to use 36” radius sweep, use a minimum of 20
times the outside diameter of the cable to calculate the
smallest radius that WSDOT will allow to be used. Note:
This usually only applies inside a building or cabinet.
26. 26
QUIZ #1 QUESTIONSQUIZ #1 QUESTIONS
u 1) Given: one 400watt HPS luminaire @ 480VAC w/50’
pole and 16’ mast arm, #6 copper conductor, 500’ run of wire
to base of luminaire pole. (all service cabinet terminations,
junction boxes & splice distances included in these lengths)
u Find: what is the voltage drop in this circuit?
u 2) Given: ITS service cabinet @120VAC - 1750 watt load.
u Find: size branch breaker
u 3) Given: 10 Kva transformer @ 240VAC - 8500 watt ITS
service cabinet.
u Find: size transformer branch breaker in service cabinet.
u 4) Given: 1 each 2 inch dia, 1 each 1 1/2inch, 1 each 1 inch
conduit - straight pull with splices.
u Find: size junction box.
27. 27
Quiz #2 QuestionsQuiz #2 Questions
u 1) Given: one 400watt HPS luminaire @ 240VAC w/40’
pole and 16’ mast arm, #6 copper conductor, 350’ run of wire
to base of luminaire pole. (all service cabinet terminations,
junction boxes & splice distances included in these lengths)
u Find: what is the voltage drop in this circuit?
u 2) Given: ITS service cabinet @120VAC - 1750 watt load.
u Find: size branch breaker
u 3) Given: 15 Kva transformer @ 480VAC - 10748 watt load
for 5 ITS service cabinets. (1 ramp meter, 1 Camera
Cabinet, 2 Data Stations & 1 HAR Station)
u Find: size transformer branch breaker in service cabinet.
u 4) Given: 1 each 2 1/2 inch dia, 2 each 2 inch, 1 each 1 1/2
inch conduit - straight pull with splices.
u Find: size junction box.
28. 28
QUIZ #1QUIZ #1 QUESTION ANSWERSQUESTION ANSWERS
u 1) Given: one 400watt HPS luminaire @ 480VAC w/50’
pole and 16’ mast arm, #6 AWG copper conductor, 500’ run
of wire to base of luminaire pole. (all service cabinet
terminations, junction boxes & splice distances included in
these lengths)
u Find: what is the voltage drop in this circuit?
u Within LINE LOSS section, see illumination load chart,
slide 20, for luminaire load (amperage).
u Answer: 400watt luminaire @ 480 volts = 1.1 amp
u Vd #6 AWG =2ALR Vd= 2 x 1.1 x 500 x 0.000510
u Vd #10 AWG =2ALR Vd= 2 x 1.1 x 62 x 0.001290
u Vd #6 AWG=0.561000 volts.Vd #10 AWG=0.175956 volts
u Vd total = 0.74 volts
30. 30
QUIZ #1QUIZ #1 QUESTION ANSWERSQUESTION ANSWERS
u3) Given: 10 Kva transformer @ 240 VAC - 8500
watt ITS service cabinet.
uFind: size transformer branch breaker in service
cabinet.
uAnswer:
uUnit load = 10000watts/240volts = 41.66amps.
uITS breaker = 41.66 amps load x 125% factor =
52.08 amps.
uBranch breaker = 60 amps
31. 31
QUIZ #1QUIZ #1 QUESTION ANSWERSQUESTION ANSWERS
u 4) Given: one each 2 inch dia, one each 1 1/2inch, one each
1 inch conduit - straight pull with splices.
u Find: size junction box.
u Answer: Length = 2” x 8 + 1 1/2” + 1”
u Length = 16” + 1 1/2” + 1”. Length = 18 1/2”
u Width=2” x 6 + 1 1/2” + 1”. Width=12” +1 1/2” +1”
u Width=14 1/2”
u Depth = largest conduit is 2” in dia. Outside dia. of 2”
conduit is 2.375” or 2 3/8”. A 2” Grounded end bushing is
+ or - 3 1/4” dia.
u Box size = 18 1/2L x 14 1/2W x 4”D (use 6” for depth to
allow clearance for ground lug on j-box)
32. 32
QUIZ #2QUIZ #2 QUESTION ANSWERSQUESTION ANSWERS
u 1) Given: one 400watt HPS luminaire @ 240VAC w/40’
pole and 16’ mast arm, #6 AWG copper conductor, 350’ run
of wire to base of luminaire pole. (all service cabinet
terminations, junction boxes & splice distances included in
these lengths)
u Find: what is the voltage drop in this circuit?
u Within LINE LOSS section, see illumination load chart,
slide 20, for luminaire load (amperage).
u Answer: 400watt luminaire @ 240 volts = 2.1 amp
u Vd #6 AWG =2ALR Vd= 2 x 2.1 x 350 x 0.000510
u Vd #10 AWG =2ALR Vd= 2 x 2.1 x 52 x 0.001290
u Vd #6 AWG=0.749700 volts.Vd #10 AWG=0.281736 volts
u Vd total = 1.03 volts
34. 34
QUIZ #2QUIZ #2 QUESTION ANSWERSQUESTION ANSWERS
u3) Given: 15 Kva transformer @ 480VAC - 10748
watt load for 5 ITS service cabinets. (1 ramp meter,
1 Camera Cabinet, 2 Data Stations & 1 HAR
Station)
uFind: size transformer branch breaker in service
cabinet.
uAnswer:
uUnit load = 15000watts/480volts = 31.25amps.
uITS breaker = 31.25 amps load x 125% factor =
39.06 amps.
uBranch breaker = 40 amps
35. 35
QUIZ #2QUIZ #2 QUESTION ANSWERSQUESTION ANSWERS
u 4) 4) Given: 1 each 2 1/2 inch dia, 2 each 2 inch, 1 each 1
1/2 inch conduit - straight pull with splices. Find: size
junction box.
u Answer: Length = 2 1/2” x 8 + (2) 2” + 1 1/2”
u Length = 20” + 4” + 1 1/2”. Length = 25 1/2”
u Width=2 1/2” x 6 +(2) 2” + 1 1/2”. Width=15” +4” +1 1/2”
u Width=20 1/2”
u Depth = largest conduit is 2 1/2” in dia. Outside dia. of
u 2 1/2” conduit is 2.875” or 2 7/8”. A 2 1/2” Grounded end
bushing is + or - 4” dia.
u Box size = 25 1/2L x 20 1/2W x 6”D (use 6” for depth to
allow clearance for ground lug on j-box)