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3-3-8

Terms in this set (23)

Any high voltage testing of cable has the possibility of causing ? .
insulation failure
OSHA 1910.269(o) does not include testing of control circuits because such circuits are tested at ultra-low voltages.
false
The maintenance VLF test voltage is normally ? of the acceptance test level voltage.
80%
The three most common methods of testing cable insulation are: using a megohmmeter, doing a VLF test, or doing a ? test.
hi-potential
Before doing a high-potential test on a cable, a ? test should first be performed to pre-qualify the insulation.
polarization index
Of all the methods used to insulate cable, polybutene-impregnated paper is the best because it has infinite resistance.
false
Tracks that form in insulation and will eventually lead to faulted cable are called ?
water trees
A high-potential test normally applies ? to the cable being tested.
over voltage
When testing a single primary cable, the guard circuit of a megohmmeter is used to prevent ? from affecting the insulation resistance reading
surface current leakage
A polarization index test is performed to ? the insulation on a cable.
pre-qualify
When using a megohmmeter to test a single cable, the ? is connected to the conductor.
line terminal
A megohmmeter measures the resistance of a cable by performing a calculation using ? .
Ohm's Law
If a cable tests as good, it means the cable never has to be tested again.
false
If a cable tests as good, it means the cable never has to be tested again.
30 minutes
High-potential tests are conducted at two or more times the rated cable voltage.
true
A ? test performed with VLF equipment is considered a non-destructive test.
diagnostic
A high-potential test can be performed with AC or DC voltage.
true
The most common frequency used in a VLF test is ? .
0.1 Hz
If a primary cable has a defect, the VLF test will force the insulation defect to penetrate the insulation.
true
A megohmmeter test is used to pinpoint insulation faults on primary cable so that repairs can be made.
false
The intent of a voltage maintenance test performed on primary cable is to ? of the cable and check its serviceability.
detect the deterioration
Three reasons a water tree may become an electrical tree are lightning impulse, excessive test voltage levels, and ? .
switching surges
There are no formal studies or recognized organizations that approve of VLF testing.
false
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