By IEEE, American National Standards Institute

Info is supplied for choosing the correct circuit breaker for a specific software. This instructed perform is helping the appliance engineer specify the kind of circuit breaker, scores, journey services, add-ons, popularity exams, and upkeep requisites. It additionally discusses circuit breakers for unique purposes, e.g., instant basically and switches. additionally, it presents info for using circuit breakers at diversified destinations within the energy method, and for shielding particular parts. guidance also are given for coordinating mixtures of line-side and load-side units.

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Extra resources for IEEE Blue Book: IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems

Sample text

Circuit breaker conductors also serve as conductive heat sinks for the circuit breaker. As heat sinks, the conductors should have a minimum cross-sectional conductor area equal to the cross-sectional conductor area of the 75 °C (167 °F) rated wire speciÞed for that circuit breaker. They should also be properly constructed in stranding and compression and should have the correct insulation temperature rating. Even though MCCBs are designed to operate in a 40 °C (104 °F) maximum ambient, the operating ambient temperature is not always 40 °C (104 °F).

NEC Section 220-10 (b) points out that the circuit breaker rating should not be less than the noncontinuous load plus 125% of the continuous load. Even with all continuous load, this results in the circuit breaker effectively being applied at no more than 80% of conductor ampacity or 80% of its own free air current rating. 30 RATING AND TESTING IEEE Std 1015-1997 NEC rules account for the application of 100% rated MCCBs by an exception to Section 22010 (b). Ó Because circuit breakers are tested and rated to account for these factors, engineers should be aware of all aspects of the application and installation environment and specify circuit breakers tested to satisfy all of them.

Fixed mounting is an option rarely used. Drawout mechanisms not only minimize the work required in circuit breaker installation and maintenance, but they facilitate rapid changeout, which minimizes system down-time. This is especially important when the circuit breaker to be changed out is a main and a building or plant shutdown is necessary to change it. Drawout mechanisms also facilitate the performance of regular Þeld inspection and maintenance services. LVPCBs can utilize a variety of trip units including the latest versions of electronic trip units that are used in large MCCBs and ICCBs as well.

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