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1. Which of the following occurs when the load applied causes the fibers on the tension side of the rung to stretch and permanently deform?

Transverse failure

Side-rail failure

Longitudinal failure

Top-edge failure

Question 1 of 25

2. When installing single conductor cables in tray systems with conductors size 4/0 and larger, they must be ________.

spaced one cable diameter apart

installed in multiple layers

installed in a single layer

derated according to the number of conductors in the tray

Question 2 of 25

3. Which if the following rules must be followed if all of the cables in a tray are smaller than 4/0?

The sum of the cross-sectional area of all cables must not exceed the maximum allowable cable fill area.

The diameter of the cables shall not exceed πD2/4.

The cables must be installed in a single layer.

The sum of all the diameters of all cables shall not exceed the cable tray width.

Question 3 of 25

4. Symbols used to show cable tray systems on working drawings are explained in the ________.

isometric drawings

detail drawings

legend

NEC®

Question 4 of 25

5. Which of the following provides a curved surface for the cable to follow as it passes from the tray?

Swivel plate

Dropout plate

Barrier plate

Splice plate

Question 5 of 25

6. A cable hanger elbow is a ________.

device used to make vertical offsets

strip of metal used to divide a section of cable tray

fitting used to suspend cables in long vertical runs

structural frame used to support piping

Question 6 of 25

7. Maintain grounding continuity in a cable tray system by connecting the motor to the cable tray system using ________.

a plastic dropout tray

an outside vertical riser

flexible metal conduit

90° horizontal elbow

Question 7 of 25

8. What kind of mounting is often used in tunnels and other underground installations where equipment is separated by long distances?

Wall

Direct rod

Center-hung

Trapeze

Question 8 of 25

9. An NEC® requirement for grounding and bonding cable tray installations is ________.

only single conductor cable may be used in cable trays used as equipment grounding conductors

metallic cable tray does not require bonding

steel or aluminum trays may be used as equipment grounding conductors

nonmetallic cable trays must be bonded with flexible bonding jumpers

Question 9 of 25

10. The maximum pull that should be exerted on cables being pulled in tray when using a basket grip is ________.

1,000 pounds

1,200 pounds

750 pounds

500 pounds

Question 10 of 25

11. The method of supporting cable trays using threaded rods and hanger clamps is known as ________.

center rail supports

pipe rack mounting

wall mounting

direct rod suspension

Question 11 of 25

12. Which of the following are used on cable trays to protect the cable insulation from direct sunlight?

Dropout plates

Swivel plates

Barrier strips

Solid covers

Question 12 of 25

13. Electrical conductors may be installed in ________.

ducts or plenums used for environmental air

nonmetallic raceways that contain steam or drainage pipes

nonmetallic cable trays in corrosive areas

hoistways

Question 13 of 25

14. Which of the following statements is true regarding cable splices in cable trays?

Splices must be insulated using NEC®-approved methods.

Splices are never permitted in cable tray.

Splices must be installed where they are inaccessible.

Splices should be left unsecured to allow for expansion and contraction.

Question 14 of 25

15. Given a cable tray that is available in standard widths of 6, 12, 18, 24, and 36 inches, what is the minimum width of a 3-inch deep cable tray used for the following cables that are all 4/0 or larger: two with 1.5-inch diameter; three with 1.75-inch diameter; and two with 2.5-inch diameter?

24 inches

18 inches

12 inches

6 inches

Question 15 of 25

16. Which of the following consists of two parallel channels connected by rungs?

Trough tray

Solid-bottom tray

Ladder tray

Center-rail tray

Question 16 of 25

17. In short vertical runs, the cables are usually supported by ________.

an underwire support system

a suspension plate

a dropout plate

the vertical riser elbow

Question 17 of 25

18. The most desirable method of exiting cable from a cable tray is ________.

over the side

from the end of the tray without a dropout plate

between rungs without a dropout plate

between rungs or from the end of the tray using a dropout plate

Question 18 of 25

19. Except for Type MC, all multiconductor cables over 600V must be separated by a solid divider from cables rated under ________.

480V

240V

1,000V

600V

Question 19 of 25

20. The details of supports and hangers for a cable tray system installation are usually worked out by the ________.

NEC®

project engineers

electrical foreman

field crew

Question 20 of 25

21. What type of fittings are used to build an offset in a cable tray system?

Tees

Wyes

Vertical adjustment splice plates

Divider strips

Question 21 of 25

22. Isolate cables of different voltages using ________.

basket trays

barrier strips

cable ties

center rail cable trays

Question 22 of 25

23. A dropout plate can be used when the cable exits the tray ________.

simply upward

between the rungs

into a conduit clamped to the siderail

into a conduit attached to the tray bottom

Question 23 of 25

24. The installation of cable tray is covered in ________.

NEC Article 386

NEC Article 440

NEC Article 392

NEC Article 250

Question 24 of 25

25. In common practice, engineering firms show the layout of the cable tray system in ________.

isometric drawings

supplemental drawings

plan view

detail drawings

Question 25 of 25

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