2-5-1

Question 1

The manufacturing of cable in the field under adverse conditions without the use of modern manufacturing equipment or quality control testing is the definition of __?__.

Answer 1

cable splicing

Question 2

The National Electrical Codes’ definition of medium voltage ranges from __?__ to __?__.

Answer 2

2,001-35,000 volts

Question 3

From a technical standpoint, one factor that influences the choice of a cable is it will be subjected to special conditions such as the presence of corrosive materials.

Answer 3

true

Question 4

Factors that influence the choice of a cable include its __?__ and its current or kVA loading capabilities.

Answer 4

voltage rating

Question 5

From a technical standpoint, heating conditions that influence the choice of cable include the ambient temperature, proximity of other cable, adjacent heat sources, and the thermal conductivity of the soil it will be buried in.

Answer 5

true

Question 6

The principal factors to be considered in the selection of conductors include materials, flexibility, size (current carrying capacity), and its __?__.

Answer 6

shape

Question 7

The advantages of using a cable with a compact sector -shaped conductor are its smaller diameter, low reactance, and a(n) __?__.

Answer 7

low voltage drop

Question 8

The most common shape of conductor used with medium voltage cables today is the __?__ conductor.

Answer 8

concentric round

Question 9

The purpose of applying strand shielding between the conductor and the insulation of the cable is to eliminate __?__ in air voids at the interstices between the conductor and the cable insulation.

Answer 9

voltage stess

Question 10

A compact round conductor is more flexible than a concentric round conductor.

Answer 10

false

Question 11

The type of cable insulation that offers excellent resistance to ozone and weathering, has good low temperature properties, good heat resistant properties, and excellent electrical properties is the __?__ type of insulations.

Answer 11

EP

Question 12

On cable circuits where the clearing time requirements of the 100% level category cannot be met and there is adequate assurance the faulted section will be de-energized in a time not exceeding one hour, cable with __?__ insulation level should be used.

Answer 12

133%

Question 13

An increase of __?__ AWG numbers will approximately double the diameter of the cable.

Answer 13

6

Question 14

One function of an insulation shield is to confine the dielectric field within the cable.

Answer 14

true

Question 15

A tape consisting of carbon-black or lamp-black impregnated in a material such as cloth, rubber, or neoprene, and applied directly over the insulation of the shielded conductors is called __?__ tape.

Answer 15

semi conducting

Question 16

Insulation shielding of medium voltage cable helps prevent high stress and __?__ by distributing the stress evenly throughout the entire insulation structure.

Answer 16

possible corona

Question 17

A luminous hair-like (curved or bent) arc discharge resulting from a partial electric breakdown. This describes the electrical discharge called __?__ as applied to medium voltage power cable.

Answer 17

corona

Question 18

The jacketing over a medium voltage cable provides both mechanical and environmental protection for the cable. Four types of material used for cable jacket include fibrous, rubber and rubber-like, thermoplastic, and __?__ sheathing.

Answer 18

metallic

Question 19

The dielectric constant of butyl rubber is __?__.

Answer 19

3.7

Question 20

One reason for using concentric neutral cables is that the bare neutral helps clear faults more rapidly.

Answer 20

true

Question 21

Insulation types come in PILC (Paper Insulated Lead Covered), EPR (Ethylene Propylene Rubber), and __?__ (Cross-Linked Polyethylene).

Answer 21

XLPE

Question 22

Medium voltage cables utilize copper, aluminum, and silver as conductor material.

Answer 22

false

Question 23

A __?__ shield is placed over the insulation shield. This shield serves as a path for the return current (neutral).

Answer 23

metallic

Question 24

When moisture fills the very fine electric stress lines that occur at voids and other insulation irregularities on a cable and spread towards the outer edge, this is known as __?__.

Answer 24

water treeing of the insulation

Question 25

Because of different types of splicing and terminating methods, it is important the cable splicer follow the manufacturer’s or __?__ specifications to the letter. Failure to do so may lead to cable failure.

Answer 25

owners