Dwelling and detached shop

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Inspectorcliff

Inspectorcliff

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Colorado
My question to the forum is this: If I have a 1186 sq ft home fed with a single phase 100 amp service, Can I run a #6 RHW AL, feeder to my detached shop and put it on a 50 amp OCD?
Thanks.:mad:
 
raider1 said:
What are the calculated loads for the home and the shop?

Chris
Click to expand...
Lets say the home is all gas, and cacul's to 43 and 1/3 amperes. And the shop is just got general recept, a buzz box 240 volt welder, drill press, GUN lathe, aircompressor, t.v., frig (for ice tea or sumtin) coffee pot, potbelly stove (wood) I guess that's enough for now. So with that being said, we will give the shop a load of 45 amps, cause he is a retired guy with no kids to help out in the shop. Is that enough info?:-?
 
I'm guessing, but given the size of the house and the all gas appliances your 100 amp service should be adequate.
 
Inspectorcliff said:
My question to the forum is this: If I have a 1186 sq ft home fed with a single phase 100 amp service, Can I run a #6 RHW AL, feeder to my detached shop and put it on a 50 amp OCD?
Thanks.:mad:
Click to expand...

There is no reason you can't run a larger wire and a 100 amp breaker as long as the calculated load isn't over 100 amps. I am not sure if that is what you are after. Certainly the #6 alum. is good for 50 amps.
 
according to 310.16 RHW AL in the 75? C column is good up to 95amps that being said you will need to derate for conduit size, length and temperature but I'd say yes
 
Jhaney said:
according to 310.16 RHW AL in the 75? C column is good up to 95amps that being said you will need to derate for conduit size, length and temperature but I'd say yes
Click to expand...

you better look again #6 Alum. rhw
 
Good catch Dennis I'm trying to read on here and work at the same time had the free air (310.17) table open for work....#6 RHW is rated for 50amps.

Sorry about that I will flog myself later
 
Jhaney said:
according to 310.16 RHW AL in the 75? C column is good up to 95amps
Click to expand...
:-?

I see it as 50A in that col.

[EDIT: I see Dennis questioned the above while I typed my reply]


Jhaney said:
that being said you will need to derate for conduit size,
Click to expand...
:-?
Where does the NEC ever mention derating for conduit size?
 
Thanks, on to bigger fish

Thanks, on to bigger fish

raider1 said:
What are the calculated loads for the home and the shop?

Chris
Click to expand...
I guess technically, I was getting at the following 230.79 (A)(B)(C) and (D)especially D.:smile:
 
Inspectorcliff said:
I guess technically, I was getting at the following 230.79 (A)(B)(C) and (D)especially D.:smile:
Click to expand...

I think you mean 225.39 ABC & D. Apparently the disco only needs to be rated 60 amp. I find this rule odd. It would appear that the wire to the garage should be rated 60 amps also. Thus I can have a 60 amp disco at the house with a 50 amp disco at the garage. Strange
 
yes,

yes,

:)
Dennis Alwon said:
I think you mean 225.39 ABC & D. Apparently the disco only needs to be rated 60 amp. I find this rule odd. It would appear that the wire to the garage should be rated 60 amps also. Thus I can have a 60 amp disco at the house with a 50 amp disco at the garage. Strange
Click to expand...
Yep, I stand corrected, not 230, but 225 since it is now a feeder versus a service. Thanks D.A. Your alright, I don't care what them other guys said.
 
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