Module Five - Cable Tray - NCCER Substation Slides

1. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Cable Tray
Module Five – 26207-11

2. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 1
Upon completion of this module, you will be able to do the following:
1. Describe the components that make up a cable tray assembly.
2. Explain the methods used to hang and secure cable tray.
3. Describe how cable enters and exits cable tray.
4. Select the proper cable tray fitting for the situation.
5. Explain the National Electrical Code® (NEC®) requirements for cable tray
installations.
6. Select the required fittings to ensure equipment grounding continuity in
cable.
7. Interpret electrical working drawings showing cable tray fittings.
8. Size cable tray for the number and type of conductors contained in the
system.
Objectives

3. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 2
Under supervision of the instructor, you should be able to:
1. Generate a list of materials for a cable tray layout. List all the
components required, including the fasteners required to complete
the system.
2. Join two straight, ladder-type cable tray sections together.
Performance Tasks

4. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 3 Figure 1 – Typical cable tray system

5. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 4 Figure 2 – Cross section of cable tray comparing
usable dimensions to overall dimensions

6. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 5 Figure 3 – Cables rest on the bottom of the tray and are
held in place by the longitudinal side rails

7. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 6 Figure 4 – Two applications of cable tray channel

8. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 7 Figure 5 – Cables packed closely together can impair efficiency

9. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 8 Figure 6 – Each tray support should be capable of safely supporting
1.25 times the weight of the entire tray and cable assembly span

10. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 9 Figure 7 – Bending of loaded tray

11. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 10 Figure 8 – Load of cable creates bending moments along the span

12. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 11 Figure 10 – Several ways in which cables may exit from a cable tray

13. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 12 Figure 11 – A dropout plate provides a curved surface
for the cable to follow as it leaves the tray

14. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 13 Figure 13 – Fabricating a cable tray offset with swivel plates

15. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 14 Figure 14 – Expansion joint and splice plates

16. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 15 Figure 16 – Alternate ways to hang cable tray

17. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 16 Figure 17 – Center rail cable tray

18. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 17 Figure 18 – NEC® regulations governing the use of cable tray

19. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 18 Figure 19 – NEC® regulations governing cable tray construction and installation

20. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 19 Figure 20 – NEC® regulations governing cable tray grounding

21. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 20 Figure 21 – Sample floor plan of a cable tray system

22. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 21
Supplemental Art

23. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 22 Course Map

24. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 23 Figure 9 – Cable pulley used to facilitate a cable pull in a tray

25. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 24 Figure 12 – Typical application of supports in a vertical run

26. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 25 Figure 15 – Channel support

27. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 26 Appendix

28. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 27 Cable Tray Installations

29. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 28 Special-Application Cable Management Systems

30. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 29 Ladder Tray

31. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 30 Basket Tray (1 of 3)

32. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 31 Basket Tray (2 of 3)

33. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 32 Basket Tray (3 of 3)

34. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 33 Center Hung Tray

35. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 34 Cable Tray in Raised-Floor Systems

36. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 35 Low-Voltage Cable (1 of 2)

37. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 36 Low –Voltage Cable (2 of 2)

38. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 37 What’s Wrong With This Picture?

39. Copyright © by NCCER,
Published by Pearson Education, Inc.
Power Line Worker Level Two: Substation – Cable Tray
Module 26207-11
National Center
for Construction
Education and
Research
Slide 38