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Extra resources for IEEE Std 1015-2006 IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems
Example text
15 Enclosure considerations All circuit breakers are fully rated for operation in free air at their listed maximum ambient temperature. All LVPCBs are applied in enclosures and all are fully rated for 32 Copyright © 2006 IEEE. All rights reserved. RATING AND TESTING IEEE Std 1015-2006 operation in their design enclosures with maximum design ambient temperature. LVPCBs are therefore said to be 100% rated. Some MCCBs are also 100% rated. 25 of UL 4891994. ” c) For compliance, “The temperatures of the insulating materials used in the circuit breaker shall not exceed the limits for the material involved,” and “The temperature rises (1) where connections are made to external bus bars, when bus bars are used; or (2) on a wiring terminal at a point to which the insulation of a wire is brought up...
The tests or test conditions are different. It is necessary to make subjective judgments to determine which test procedure might be more severe than another. Although choices may be made by subjective judgment of test procedures, an alternative method is to follow established practices that have a history of long-term successful performance. Fortunately, information on these practices is often available in the engineer's own facility, and if it is not, references such as IEEE Std 493™-1990 [B9], which discusses reliability in general and contains sets of data that can be of assistance in decision making, can be consulted.
Of conductors 2 — 3/0 2 — 250 1c — 500 1c — 750 450 2 — 4/0 2 — 300 500 2 — 250 2 — 350 550 2 — 300 2 — 500 600 2 — 350 2 — 500 700 2 — 500 3 — 350 Copyright © 2006 IEEE. All rights reserved. IEEE Std 1015-2006 RATING AND TESTING Table 3-6—Terminal current and conductor size (continued)d Aluminum or copper-clad aluminum conductor Copper conductor Terminal current (A)a No. of conductors Size (AWG or kcmil) 60 °C 75 °C No. , if rated 35 A, enter at 40 A). b Circuit breakers rated at more than 4000 A are to be considered as being bus- or cable-connected unless indicated otherwise in marking.