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Automatic transfer switches must also be operated monthly. The monthly test. consists of electrically operating the transfer switch from the standard position to. the alternate position and then a return to the standard position.
Tip: The amp rating of the circuit in the main breaker panel must be the same or smaller than the rating of the sub-panel connected to it. Also, the only limit for the number of sub-panels you can have is the number of available circuits in the main breaker panel. Transfer switches are a type of sub-panel that transfers portable generator power into electrical power through your breaker panel.