Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The root mean square of the electrical current which a device (usually a wire) can carry within a specific environment (including temperature rating, power loss, heat dissipation, etc.) It is measured in amperes, (amps) and is most often used to rate electrical wires and cables.

Etymologies

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Examples

  • Figure 3 illustrates a 2,500 A breaker frame with a 1,600 A trip unit (higher ampacity trip units are available to the full-frame rating).

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  • Conductors equal to the full ampacity of the circuit breaker must be extended to the power terminal block

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  • Figure 6 provides an additional example of taps to serve lower-ampacity loads from higher-ampacity circuit breakers-only from different series of circuit

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  • Figure 6 provides an additional example of taps to serve lower-ampacity loads from higher-ampacity circuit breakers, only from a different series of circuit breakers.

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  • In practice, the 600 A circuit breaker may contain a lower-ampacity trip unit to avoid the necessity to oversize the incoming cable.

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  • The number and size of loads in an industrial control panel or NEC installation frequently require a circuit breaker 800 A or greater to be used as a main device, with lower-ampacity circuits tapped from it.

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  • In brief, the rules for tapping feeder circuits indicate that a conductor rated 10% of the ampacity of a feeder conductor may be tapped from the feeder, provided it is not greater than 10 ft in length and it terminates in an appropriately sized OCPD.

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  • The feature is normally used for paralleling cables to feed the full ampacity of the breaker to a load.

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  • Also, a conductor rated one-third the ampacity of a feeder conductor may be tapped from the feeder provided its length is not greater than 25 ft and it terminates in an appropriately sized OCPD.

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  • The 4/0 cable must terminate on a circuit breaker of the correct ampacity, namely 225 A or smaller.

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