CDC 3E051B Vol.3 Unit 2

What minimum depth below grade should you install a 12,470 volts alternating current (VAC) circuit using rigid, nonmetallic conduit?

A) 24 inches.
B) 18 inches.
C) 36 inches.
D) 42 inches.

Ducts that terminate in a building must be sealed to prevent...

A) insects and rodents from entering a building.
B) fire and smoke from entering a building.
C) insects and gases from entering a building.
D) gases and rodents from entering a building.

What information is marked on manhole covers?

A) Ownership or type of utility.
B) Presence of high voltage.
C) Circuit identification.
D) Cable direction.

What is the minimum size of a constructed manhole?

A) 4 feet by 6 feet by 6 feet.
B) 8 feet by 8 feet by 8 feet.
C) 8 feet by 10 feet by 8 feet.
D) 6 feet by 7 feet by 6 feet.

The use of 90° bends in duct lines is permitted for...

A) duct runs of less than 50 feet.
B) pole risers.
C) stranded copper cables.
D) cables that are no. 2 AWG or smaller.

What is the purpose of a vault?

A) Isolate electrical equipment.
B) House submersible regulators.
C) Open faulted underground cable.
D) House multiple cable racks.

Junction boxes located in an underground vault must...

A) be no smaller than 24 inches.
B) have ventilation ports.
C) provide a water-tight seal.
D) be painted.

The mechanical strength of underground cable is not a major concern because the cable is...

A) kept cooler underground.
B) insulated.
C) hard drawn.
D) not under tension.

What material is used between the conductor and the cable insulation?

A) Strand shielding.
B) Varnish cambric.
C) Metal braid.
D) Plastic sheath.

When pulling cable, the snatch block and pulling rope is attached to...

A) the pulling-in iron in the manhole.
B) a wire rope and flexible duct.
C) a wire rope and flexible steel conduit.
D) coupling rods in the manhole.

What is the device used to attach the underground cable to the pulling rope?

A) Snatch block.
B) Feeding tube.
C) Basket grip.
D) Mandrel.

Which procedure do you use to assure that a duct is clear of obstructions?

A) Drawing.
B) Rodding.
C) Swabbing.
D) Rigging.

Why is proper cable reel placement important?

A) Ensures cable is installed in the correct duct.
B) Proper cable reel placement is not important.
C) Ensures bend in the cable is not reversed.
D) To allow the reel to be lubricated properly.

How many people does it take to pull underground cable safely using the winch method?

A) 4.
B) 5.
C) 6.
D) 7.

What term describes an underground cable that is brought up through a conduit and attached to an overhead line?

A) Termination.
B) Riser.
C) Transition duct.
D) Duct run.

The device used to terminate high-voltage cables is called a...

A) high-voltage termination.
B) skirted cable end seal.
C) skirted weatherhead.
D) conduit riser.

When making a load-break elbow, before attaching the crimp connector to the cable make sure you...

A) apply corrosion inhibitor to the cable.
B) clean the cable with alcohol.
C) align the hole on the end of the connector with the equipment bushing.
D) apply semi-conducting tape to the conductor for the length of the elbow.

After sliding the elbow over the connector and cable the next step is to...

A) thread the electrode into the connector until it is hand tight.
B) attach the threaded electrode to the connector using a pair of adjustable pliers.
C) crimp the electrode onto the connector.
D) thread the electrode into the connector using the wrench from the elbow kit.