20 amp lighting circuit

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Matt Mckenzie

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If you have a lighting circuit loading at 20amps on a #12thhn in a conduit can you just put a 25 amp breaker on it? Ampacity chart says #12thhn is good for 25amps in comduit
 
Depending on what type of lighting circuit you might not even be allowed to load it 20 amps.
 
Matt Mckenzie said:
If you have a lighting circuit loading at 20amps on a #12thhn in a conduit can you just put a 25 amp breaker on it? Ampacity chart says #12thhn is good for 25amps in comduit
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Lighting is almost always a continuous load, so if you have an actual load of 20 amps you need a 24 amp circuit. This is also assuming you have lighting type that can be on more than a 20 amp circuit. Plus there is also the already mentioned 240.4(D)(5)
 
kwired said:
Lighting is almost always a continuous load, so if you have an actual load of 20 amps you need a 24 amp circuit. This is also assuming you have lighting type that can be on more than a 20 amp circuit. Plus there is also the already mentioned 240.4(D)(5)
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Twenty five? :)
 
kwired said:
Should have worded it better, I intentionally said 24 meaning conductor ampacity can't be less than 24, but yes 25 is next standard overcurrent device.
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A 24 amp circuit is too small. :D {20*125% = 25}
 
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