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Electrical Codes, Standards, Recommended Practices and Regulations
book

Electrical Codes, Standards, Recommended Practices and Regulations

by Robert J. Alonzo
January 2010
Intermediate to advanced content levelIntermediate to advanced
512 pages
18h 35m
English
William Andrew
Content preview from Electrical Codes, Standards, Recommended Practices and Regulations
and compared to the other step data. If a calculated leakage resistance decreases by 50% or
more, testing should be discontinued because the conductor insulation is near failure [12].
The ratio of the leakage current after one (1) minute to the leakage current after 5 minutes is
called the Polarization Index (PI). This value should be between 1.25 and 2 or greater for good
conductors. Values less than 1 are considered failing. Values between 1 and 1.25 are marginal.
Periodic cable insulation testing and recording of the PI data will allow tracking of the cable’s
ability to safely deliver electrical power and planned scheduling of the cable’s replacement ...
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ISBN: 9780815520450