Hioki 3455 - Appendix 2 Example of Insulation Resistance Criteria; Appendix 3 Example of PI Criteria; (Polarization Index)

Appendix 2 Example of Insulation Resistance Criteria
162
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