20 amp lighting circuit

[Matt Mckenzie]

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

 

[brantmacga]

240.4(D)(5)

No.


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[infinity]

Depending on what type of lighting circuit you might not even be allowed to load it 20 amps.

 

[MAC702]

Of course not. The copper manufacturers would never allow their lobbyists to permit that.

 

[kwired]

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

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)

 

[infinity]

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)

Twenty five?

 

[kwired]

Twenty five?

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.

 

[infinity]

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.

A 24 amp circuit is too small. {20*125% = 25}

 

[kwired]

A 24 amp circuit is too small. {20*125% = 25}

:huh:don't know what I was thinking, but you are right.