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  Identifying Current Capacity of Circuit Breaker

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Author Topic:   Identifying Current Capacity of Circuit Breaker
Henry posted 06-22-2007 11:37 AM ET (US)   Profile for Henry   Send Email to Henry  
My 1988 Montauk has a circuit breaker located under a box mounted to the starboard gunwhale near the stern. The breaker is probably the original and has no identifying information left on it. Is it correct that the original circuit breaker on the Montauk was 30 amps?
jimh posted 06-26-2007 08:52 AM ET (US)     Profile for jimh  Send Email to jimh     
It is universal that a circuit breaker will have a label which indicated the current capacity. The legend may be imprinted on the moveable handle or plunger, or may be affixed to the side of the device. Remove the device from the plastic enclosure and visually inspect it for evidence of its capacity.

The capacity of the circuit breaker has to be matched to the size of the wire conductor it is protecting. In most cases the wiring on a Boston Whaler boat was done with 8-AWG conductors. This implies that the circuit breaker could be as large as 50-ampere. However, on a small boat like a Boston Whaler center console, it is unlikely that the electrical load at the helm console will exceed more than 20-ampere. You can use a smaller circuit breaker, sized to correspond with the load, if you wish.

Henry posted 06-27-2007 12:59 AM ET (US)     Profile for Henry  Send Email to Henry     
Thanks Jimh for the reply. The circuit breaker on my boat is so old that there is no identifying info on it except "Carling Switch, Inc. ... U.S. Pat Nos. ... Others Pend."

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