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Question by  Emily76 (58)

# Can you use a 15 amp light sensor on a 20 amp circuit?

I would like to make sure my amp will not blow the light sensor.

 +1 vote! +7 you voted Answer by  DrGats (12) Yes you can. The total amp rating of your entire circuit is 20 amps. This means that you can use any rating amp light sensor that does not exceed 20 amps. Your 15 amp light sensor is perfectly within this range and will therefore work well in the 20 amp circuit.

 +1 vote! +6 you voted Answer by  Wildinjn (24) Technically NO, you can not use a 15 amp light sensor on a 20 amp circuit. The reason is that the circuit has the potential to draw a max of 20 amps which would blow the light sensor. If you knew that the load will NEVER be more than 15 amps then you could attemp this but its not suggested.

 +1 vote! +6 you voted Answer by  C4rys3 (56) You can use any rating amp sensor so long as it does not exceed the total amp rating for the entire circuit. You would not be able to use a 25 amp light sensor on a 20 amp circuit because you would then draw to much current on the wire and possibly cause a fire.

 +1 vote! +5 you voted Answer by  LSK (51) Current only will be draw based on loading light sensor itself. Therefore, size of circuit breaker of the circuit shall be 1.3 ~ 1.5 times of nominal rated current of the light sensor.

 +1 vote! +5 you voted Answer by  dbal (60) The induction coil load will consumes electrical current of about 1. 5 times of rated capacity at the starting time. But for the electrical light sensor, the current consumption will be within the rated capacity at the starting time. Hence we can use a 15 amp light sensor on a 20 amp circuit.

 +1 vote! +4 you voted Answer by  lewismoeller (88) Yes you may. You just can not exceed the given amp for that given circuit. Doing so will either blow the breaker or even cause a fire.

 +1 vote! +2 you voted Answer by  Jdog37 (592) You should be ok doing this. If you were really worried you could swap the 20 amp breaker out and put in a 15 amp. That way the maximum allowed amps would be 15.