Next size up rule.

[ctaylo360860]

I’m planning on running 3-#2 copper thhn/thwn and 1-# 8 cu thhn/thwn cu wires inside lfmc to a remote distribution panel.

According to 310.16 in the 60 def column 2 is good for 95 amps

240.6 only had a 90 and a 100 as standard sizes
Because of this and my load being very small I should be fine to fuse #2copper on a 100a circuit breaker ?

 

[Dennis Alwon]

Why are you using the 60C column. You can use the 75C column but either way you can use 100 amp breaker.

 

[ctaylo360860]

The job plans

 

[ctaylo360860]

Why are you using the 60C column. You can use the 75C column but either way you can use 100 amp breaker.

I thought because of the flex being in a wet location I have to use the 60degree column

 

[Dennis Alwon]

Also why are you using flex instead of pvc?

 

[petersonra]

Also why are you using flex instead of pvc?

maybe he has a couple rolls of it laying around he wants to use up?

 

[ctaylo360860]

Also why are you using flex instead of pvc?

Planned on outing the new service on opposite side of pole. I work alone and it’s for a fueling station so they don’t want to be down for long…

 

[infinity]

The #2 AWG is fine on a 100 amp OCPD.

 

[petersonra]

The #2 AWG is fine on a 100 amp OCPD.

isn't there some kind of rule that says you have to use the 60 deg C column for conductors in LFNC?

 

[infinity]

isn't there some kind of rule that says you have to use the 60 deg C column for conductors in LFNC?

It's been argued here that you do but the thread title is Next Size Up Rule. Even at 60° C #2 THWN is rated at 95 amps. Next size up 100 amps.

 

[ctaylo360860]

It's been argued here that you do but the thread title is Next Size Up Rule. Even at 60° C #2 THWN is rated at 95 amps. Next size up 100 amps.

That’s why I was questioning it because of the previous discussion about the rating of flex in a wet environment

 

[ctaylo360860]

Thank you all for the confirmation!