Module 26207 Cable trays

Except for Type MC, all multiconductor cables operating at or above 1000V must be separated by a solid divider from cables operating under ____.

• 240V

• 480V

• 600V

• 1,000V

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

• Top-edge failure

• Longitudinal failure

• Side-rail failure

• Transverse failure

Which of the following is an NEC® requirement for grounding and bonding cable trays?

• Only single conductor cable may be used in cable trays used as equipment grounding

• Nonmetallic cable trays must be bonded with flexible bonding jumpers.

• Steel or aluminum trays may be used as equipment grounding conductors.

• Metal cable tray does not require bonding.

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

• Swivel plate

• Splice plate

• Dropout plate

• Barrier plate

A cable hanger elbow is used to ____.

• a. suspend cables in long vertical runs

   

• divide a section of cable tray

• support piping

• make vertical offsets

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

• installed in multiple layers

• installed in a single layer

• spaced one cable diameter apart

• derated according to the number of conductors in the tray

The most desirable method of exiting cable from a cable tray is

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

• over the side

• from the end of the tray without a dropout plate

• between rungs without a dropout plate

Welding cable may only be installed in a ____.

• dedicated cable tray

• nonmetallic cable tray

• cable tray with steam and drainage pipes

• cable tray in hoistway

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

• a suspension

   plate

• a dropout plate

• the vertical riser elbow

• an underwire support system

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

• Wall mounting

• Direct rod mounting

• Trapeze mounting

• Center-hung mounting