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 greywolf6 07-13-2008 06:59 AM

wire size

I am not sure of wire size I need to wire a heater 240 volt 38 amp about 10 ft run. also will a 50 amp breaker work safely?

 jrclen 07-13-2008 09:43 AM

Quote:
 Originally Posted by greywolf6 (Post 138624) I am not sure of wire size I need to wire a heater 240 volt 38 amp about 10 ft run. also will a 50 amp breaker work safely?
A number 6 wire on a 50 amp breaker will work fine.

 nap 07-13-2008 11:19 AM

unless this is UF, what is wrong with a #8 ?

 chris75 07-13-2008 02:07 PM

Quote:
 Originally Posted by nap (Post 138701) unless this is UF, what is wrong with a #8 ?
A agree and this is why....

If this is fixed electric heat then 424.3(B) applies.... 125% added to the branch circuit... 38 Amps x 125% = 47.5 Amps, looking at 310.16, #8 AWG is good for 50 amps @ 75ºC, as long as its not NM wire, which is restricted to the 60º column at 40 AMPS.

 jrclen 07-14-2008 08:36 AM

I completely agree with you guys. I knew when I posted that someone would confuse the guy with facts. I am going with the #6 because he is putting in NM. How do I know? I don't. But like I said, the #6 will work just fine with a 50 amp breaker. :thumbsup:

 chris75 07-14-2008 04:10 PM

Quote:
 Originally Posted by jrclen (Post 139004) I completely agree with you guys. I knew when I posted that someone would confuse the guy with facts. I am going with the #6 because he is putting in NM. How do I know? I don't. But like I said, the #6 will work just fine with a 50 amp breaker. :thumbsup:
I just hate people to spend money they dont have to, but you sure make an excellent point, I do admit that.

 jrclen 07-14-2008 05:56 PM

Quote:
 Originally Posted by chris75 (Post 139151) I just hate people to spend money they dont have to, but you sure make an excellent point, I do admit that.
Hopefully the OP will come back and let us know more details. I do agree about the money.

 nap 07-14-2008 06:57 PM

Quote:
 Originally Posted by jrclen (Post 139004) I completely agree with you guys. I knew when I posted that someone would confuse the guy with facts. I am going with the #6 because he is putting in NM. How do I know? I don't. But like I said, the #6 will work just fine with a 50 amp breaker. :thumbsup:

My commercial/industrial mentality made me do it.:whistling2:

 jrclen 07-14-2008 09:08 PM

Quote:
 Originally Posted by nap (Post 139218) My commercial/industrial mentality made me do it.:whistling2:
I can relate to that Nap. I am working very hard to overcome that. I just switched to resi myself. I was just showing off my recent discovery of having to use the 60c column for NM. :laughing:

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