By IEEE, American National Standards Institute
Info is equipped for choosing the right kind circuit breaker for a specific program. This advised perform is helping the applying engineer specify the kind of circuit breaker, scores, journey capabilities, components, popularity exams, and upkeep standards. It additionally discusses circuit breakers for certain purposes, e.g., on the spot basically and switches. moreover, it offers info for making use of circuit breakers at various destinations within the energy procedure, and for safeguarding particular elements. instructions also are given for coordinating mixtures of line-side and load-side units.
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Extra info for IEEE Blue Book: IEEE Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems
Example text
They affect circuit breaker components (such as the primary current-carrying conductors or the iron cores of sensors) and/or accessory devices. The extent of their effects on operation determines whether a given circuit breaker can be de-rated for use or cannot be used at all at higher frequency. At lower frequency or dc, the method of current sensing may dictate whether a given circuit breaker can or cannot be used. Obviously, a circuit breaker utilizing transformer action for current sensing in its trip unit can not be used for dc applications.
It may be necessary to rope-tie conductors into place in some cases. When this is necessary, instruction sheets describe how it is to be done. 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.
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.