Circuit protection It’s a good idea to allow for a cushion to prevent a circuit breaker from shutting off. Looking at circuit breakers, a 20-amp circuit breaker is the most often used for standard ...

Appropriate for a two-pole 20-amp breaker or a single-pole 30-amp breaker. 8-gauge or 6-gauge wire Used for 40-, 50- and 60-amp two-pole breakers; large appliances. Also used to serve subpanels.

This standard applies to all air circuit breakers with interrupting rating over 10,000 amperes as follows: A. Air circuit breakers 1500 volts or less alternating current and 3000 volts or less direct ...