What size breaker & wire

[Jerkyboys]

Hello. What breaker & wire size?? I’m installing a 6000 watt heater @ 240 volts. So 6000/240=25 amps x 125% continuous load = 31.25 amps. Can I use a 35 amp two pole breaker & 10 awg? Can I use 10/2 romex or does it need to be THHN in pvc? Thanks

 

[infinity]

You'll need #8 conductors.

 

[petersonra]

Hello. What breaker & wire size?? I’m installing a 6000 watt heater @ 240 volts. So 6000/240=25 amps x 125% continuous load = 31.25 amps. Can I use a 35 amp two pole breaker & 10 awg? Can I use 10/2 romex or does it need to be THHN in pvc? Thanks

You cannot use number 10 anything.

Whether you use Romex or PVC is a design choice.

 

[acin]

You'll need #8 conductors.

is that using the 60 deg column?

 

[petersonra]

is that using the 60 deg column?

There is a special rule for number 10 conductors that says you can't have more than a 30 amp over current protection device. I don't recall exactly where this is but it's like a note in the ampacity chart. There's like an asterisk next to the value in the chart and if you look down at the bottom there's another asterisk and it says you can't actually use the value that's in the 75° table for that size wire.

 

[acin]

There is a special rule for number 10 conductors that says you can't have more than a 30 amp over current protection device. I don't recall exactly where this is but it's like a note in the ampacity chart. There's like an asterisk next to the value in the chart and if you look down at the bottom there's another asterisk and it says you can't actually use the value that's in the 75° table for that size wire.

got it 240 4 d . unless 240 4 G

 

[infinity]

is that using the 60 deg column?

No it's because of 240.4(D) as acin mentioned.