Running a continuous electrical load that draws exactly 20 amps on a standard 20-amp circuit breaker should not instantly trip the breaker, but it operates right at its maximum rated threshold. Standard thermal-magnetic residential breakers are governed by the National Electrical Code 80% continuous load rule, meaning a dedicated 20-amp circuit should ideally sustain no more than 16 amps of continuous load over a three-hour period to avoid nuisance thermal tripping.
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