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Loads should not be more than 80% of the breaker. So a drier that has a 30a breaker should only draw 24a max continously.

It is NEC and UL compliant to load a circuit 100% for non-continuous loads.

A dryer would be a non-continuous load as defined by the NEC. It does not operate for more than 3 hours at a time.

Bob Badger
Construction & Maintenance Electrician
Massachusetts