Posted by John T on January 22, 2012 at 07:39:36 from (71.52.113.165):
In Reply to: fuse/circuit breaker posted by Dave Sherburne NY on January 21, 2012 at 19:18:24:
While either will work and both have advantages and disadvantages, since its an antique auto Id use a fuse instead of a circuit breaker.
To size the fuse and circuit wiring gauge you
FIRST determine the total actual load CURRENT by adding all the lights total wattage and divide by the voltage Watts = Volts x Amps and Amps = Watts/Volts
SECOND you determine the necessary wire gauge, as an example Id use 12 gauge if the continuous load was say 16 amps,,,14 gauge if the continuous load was like 12 amps etc but I wouldnt go less then 14 gauge regardless
THIRD size the fuze to protect the wire (its amp rating) as an example if the wire is rated for 20 amps you can use a 20 amp fuze, if the wire is rated for 15 amps use a 15 amp fuse etc
YOU DETERMINE THE LOAD,,,,,,,,SELECT THE WIRE TO HANDLE A CONTINUOUS LOAD (I use an 80% safety factor i.e. if the wire is rated 20 amps I dont like more then a 16 amp continuous load) THEN SELCT THE FUSE SIZE TO PROTECT THE WIRING
As a pure guess youre probably lookng at 12 gauge wire and a 20 amp fuze or 14 gauge wire fused at 15
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