Appendix 2 Example of Insulation Resistance Criteria
164
Primary criteria for insulation resistance of high-voltage cable
(as a rough guide)
High-voltage power receiving facility code 2002
IEEE43-2000 Recommended Practice for Testing Insulation
Resistance of Rotating Machinery recommends the criteria
as shown in the table below for insulation resistance testing
of a motor.
Appendix 2 Example of Insulation
Resistance Criteria
Part of cable
Measurement
voltage [V]
Insulation
resistance
[M]
Judgment
Insulator
5,000
5,000 or more
Non-
defective
500 to below
5,000
Needs
attention
below 500 Defective
Sheath
500 or 250 1 or more
Non-
defective
Appendix 3 Example of PI Criteria
(Polarization Index)
Heat resistance class Recommended lowest PI
Class A
1.5 or more
Class B
2.0 or more
Class F
2.0 or more
Class H
2.0 or more
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