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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
Overload relays also have a limit of self-protection which is defined for device operation at
40
C. NEMA ICS 2 defines it as:
The maximum current value that an overload relay can respond to without sustaining damage
that will impair its function. [25]
Inverse-time overload relays also have time-current characteristic curves for operation at
40
C ambient conditions. Those curves express:
the maximum operating times in seconds under the designated conditions associated with the
current rating, at current values corresponding to multiples of the current rating. [26]
Overload relays have contacts which are controlled by the relay operation. Those contacts ...
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Publisher Resources

ISBN: 9780815520450