Circuit Breaker Size Calculator

v1.0

Calculate the correct circuit breaker size for a continuous load using the NEC 125% rule.

Electrical Engineering Suite

Circuit Breaker Size Calculator

Load Input

NEC Article 210.20 requires breakers sized at 125% of continuous load.

Recommended Breaker

Standard Breaker Size

20A

Required Rating: 20.00A (125% Rule)

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NEC Article 210.20 requires breakers serving continuous loads (3+ hours) to be sized at 125% of the load current to prevent nuisance tripping and overheating.
Common standard breaker sizes include 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, and 200 amps.
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