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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
Full-voltage, two-speed motor controllers are available in two motor-winding
configurations:
Single-winding two-speed motors
Two-winding two-speed motors
Because of the potential for short-circuit-induced currents in any unused portion of a delta
configured motor winding, the controller must be designed to open one corner of each unused
delta winding not operating in the circuit.
NEMA ICS 2 establishes the range of operating voltages for contactor/controller coils. AC
controller coils should be capable of operating without sustaining damage between 85% and
110% of their rated voltage. It also requires that should a control-circuit transformer be used to ...
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Publisher Resources

ISBN: 9780815520450