Chapter 2
Facility Guidelines
Electrical Load Requirements (Circuit Breaker Sizing)
11
Electrical Load Requirements (Circuit Breaker Sizing)
It is always a good idea to derate power distribution systems for one or more of the following reasons:
• To avoid nuisance tripping from load shifts or power transients, circuit protection devices should never be
run above 80% of their root-mean-square (RMS) current ratings.
• Safety agencies derate most power connectors to 80% of their RMS current ratings.
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