2-5-11

Question 1

Any high voltage testing of cable has the possibility of causing __?__.

Answer 1

insulation failure

Question 2

OSHA 1910.269(o) does not include testing of control circuits because such circuits are tested at ultra-low voltages.

Answer 2

false

Question 3

The maintenance VLF test voltage is normally __?__ of the acceptance level test voltage.

Answer 3

80%

Question 4

The three most common methods of testing cable insulation are using a megohmmeter, doing a VLF Test or a(n) __?__Test

Answer 4

hi potential

Question 5

Before doing a High-Potential test on a cable, a __?__ test should be first performed to pre-qualify the insulation.

Answer 5

polarization index

Question 6

Of all the methods used to insulate cable, polybutene-impregnated paper is the best because it has infinite resistance.

Answer 6

false

Question 7

Tracks that form in insulation and will eventually lead to a faulted cable are called __?__.

Answer 7

water trees

Question 8

A Hi-Pot test normally applies __?__ to the cable under test.

Answer 8

over voltage

Question 9

When testing a single primary cable, the guard circuit of a megohmmeter is used to prevent __?__ from affecting the insulation resistance reading.

Answer 9

surface current leakage

Question 10

A polarization index test is performed to __?__ the insulation on a cable.

Answer 10

pre-qualify

Question 11

When using a megohmmeter to test a single cable, the __?__ is connected to the conductor.

Answer 11

line terminal

Question 12

A megohmmeter measures the resistance of a cable by performing a calculation using __?__.

Answer 12

ohm’s law

Question 13

If a cable test as good, it means the cable never has to be tested again.

Answer 13

false

Question 14

The suggested testing time for a very low frequency test is __?__.

Answer 14

30 min

Question 15

High Potential tests are conducted at two or more times the rated cable voltage.

Answer 15

true

Question 16

A __?__ test performed with VLF equipment is considered a non-destructive test.

Answer 16

diagnostic

Question 17

A High-Potential test can be performed with AC or DC voltage.

Answer 17

true

Question 18

The most common frequency used in a VLF test is __?_

Answer 18

0.1 Hz

Question 19

If a primary cable has a defect, the VLF test will force the insulation defect to penetrate the insulation.

Answer 19

true

Question 20

A megohmmeter test is used to pinpoint insulation faults on primary cable so that repairs can be made.

Answer 20

false

Question 21

The intent of a voltage maintenance test performed on primary cable is to __?__ of the cable and check its serviceability.

Answer 21

detect the deterioration

Question 22

Three reasons a water tree may become an electrical tree are lightning impulse, excessive test voltage levels, and __?__.

Answer 22

switching surges

Question 23

There are no formal studies or recognized organizations that approve of VLF testing.

Answer 23

false