Underground Power Cables

Question 1

An eventual cable failure can be caused by ? .

Answer 1

excessive tension when pulling the cable into the conduit

Question 2

A pressure point on the cable from a rock pushing against it may cause an eventual cable failure.

Answer 2

true

Question 3

If the electric field becomes concentrated in any one point of a cable insulation, the electrical stress in that location will lead to ? .

Answer 3

insulation failure

Question 4

The metallic shield applied over the insulation shield can serve as a path for the ?

Answer 4

neutral or return current
Fault current

Question 5

A layer of ? on the inside and outside of the insulation spreads the electric field uniformly.

Answer 5

semi-conducting material

Question 6

When making splices or terminations, any damage done while stripping the insulation shield from the insulating layer could result in a phenomenon called ? , which could eventually damage the cable.

Answer 6

partial discharge

Question 7

Moisture can enter where the cable is cut during installation or during storage and cause premature failure due to ? .

Answer 7

water treeing

Question 8

When a cable jacket is applied over the metallic shield, it is used to provide an improved return path (neutral) for extra conductivity.

Answer 8

False, for extra protection

Question 9

A splice kit specification describes the sleeve, dies, and ? that should be used on a splice joint.

Answer 9

press

Question 10

To locate a cable using a typical cable locator, a ? .

Answer 10

receiver with a directional antenna is swept from side to side

Question 11

A cable needs to be taken out of service using a lockout/tagout process in order to use the transmitter of a typical cable locator.

Answer 11

true

Question 12

A method that will help keep a pull within the tension limits of the cable is to ? .

Answer 12

install a weak link at the pulling eye to act as a mechanical fuse

Question 13

When splicing a cable, the cable is reconstructed so a conductor shield, an insulation shield, a neutral, and a jacket are all installed in a manner so there will be no added concentration of electrical stress on the insulation.

Answer 13

true

Question 14

Semi-conducting tape must not touch the conductor when making a splice.

Answer 14

false

Question 15

Cables are put in conduit or in an envelope of sand to prevent any sharp pressure against the cable.

Answer 15

true

Question 16

If digging is required near energized cables, ? .

Answer 16

digging must be by hand or with a sucker truck

Question 17

It is hazardous to touch a cable after a high voltage test has been completed because a cable is basically a ? and will have voltage on it after a high voltage test is completed.

Answer 17

capacitor