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Read or Download IEEE Std 1015-2006 IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems PDF
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Extra info for IEEE Std 1015-2006 IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems
Sample text
The number of strands making up stranded conductor is an important factor in how well connectors can hold conductors against magnetic forces. See Table 8 of Chapter 9 of the NEC for a listing of normal conductor stranding to be used for circuit-breaker wiring, and see the notes below that table. The NEC requires stranding for conductors of size 8 AWG and larger. Note that very flexible, finely stranded conductor, sometimes called welding cable, should not be used unless the connector is designed for it because the fine stranding is difficult or impossible to constrain under some standard terminal clamps.
The ratings are proven in testing. Because of the benefits and associated limitations of different types of grounding systems, testing of slash voltage-rated circuit breakers is different from the testing of straight voltage-rated circuit breakers. IEEE Std 142™-1991 [B6] discusses grounding considerations in detail. Slash voltage-rated circuit breakers take advantage of the fact that the power system neutral is fixed at ground potential. Table 3-4 indicates the various tests required of MCCBs and ICCBs as a function of the different numbers of poles of the circuit breaker and the different voltage ratings to be applied.
RATING AND TESTING Copyright © 2006 IEEE. All rights reserved. Table 3-9—Preferred current ratings for LVPCBs without instantaneous direct-acting phase trip elements (short-time-delay element or remote relay)d (continued) IEEE Std 1015-2006 45 Range of trip-device current ratings (A)c System nominal voltage (V) Rated maximum voltage (V) Insulation (dielectric) withstand (V) Three-phase shortcircuit current rating or short-time current rating (symmetrical A)a, b Frame size (A) Col 1 Col 2 Col 3 Col 4 22 240 254 2200 23 240 254 24 240 254 Line no.