NETA Power Cable Test Methods 2

Question 1

When performing a DC high-potential test on a shielded cable, where should the voltage be applied?

Accepted Answer

Between conductor and shield/ground

Answer

Between two conductors simultaneously

Answer

To the outer jacket only

Answer

Between the shield and the conduit

Question 2

Which test method is best suited for locating the position of a fault in an underground cable?

Accepted Answer

Time Domain Reflectometry (TDR)

Answer

Power factor testing

Answer

DC hipot step voltage test

Answer

Insulation resistance megohm test

Question 3

A cable's insulation resistance reading drops significantly when corrected to 20°C compared to the reading taken at 40°C. What does this indicate?

Accepted Answer

The insulation may be deteriorating since temperature correction should increase the reading

Answer

The temperature correction was applied correctly and IR is normal

Answer

The cable is acceptable for service

Answer

The megohmmeter is faulty

Question 4

What is the primary purpose of a guard terminal on a megohmmeter when testing cables?

Accepted Answer

To eliminate surface leakage current from the measurement

Answer

To boost the output voltage

Answer

To discharge the cable after testing

Answer

To provide a safety ground for the operator

Question 5

During a VLF (Very Low Frequency) hipot test, what typical frequency is used?

Accepted Answer

0.1 Hz

Answer

1 Hz

Answer

10 Hz

Answer

60 Hz

Question 6

A cable section shows an absorption ratio (IR1min / IR30sec) of 1.0. How should this result be interpreted?

Accepted Answer

Insulation is likely contaminated or wet

Answer

Insulation is in excellent condition

Answer

The test was performed incorrectly

Answer

The cable has a shorted conductor

Question 7

Which NETA standard provides acceptance and maintenance test values for power cables?

Accepted Answer

ANSI/NETA ATS

Answer

ANSI/NETA MTS

Answer

IEEE 400

Answer

NFPA 70B