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1982shawn 10-06-2010 06:07 PM

garage conduit size?
 
Okay i just bought a new welder. It is going to require an 80 amp breaker. I bought 300ft of thhn 4awg wire to run a subpanel for the welder. My plan is to put an 80 amp breaker in my main then run the 4awg to the subpanel. The subpanel will be a main lub type with a 80 amp breaker used as the main breaker instead of using the lugs to power the subpanel. My main concern is running the wire. Im willing to bet the NEC requires it to be in a raceway. What size conduit will i need? there are going to be many 45 and 90 degree bends in the conduit due to manuevering around an i beam and brick chimney.

All thoughts and advice is greatly appreciated

Jim Port 10-06-2010 07:08 PM

You are limited to 360 degrees of bend between access points.

You cannot run individual conductors without a raceway.
What type of material are you going to use for the conduit?

teamo 10-07-2010 12:41 PM

If you are back feeding the panel through the breaker then I think that you also need a hold down kit.

1982shawn 10-07-2010 06:05 PM

Jim, lol i found the 360 degree rule in a thread about the NEC yesterday after i posted. I was also looking around at different products and i am highly interested in the orange carlon flexible raceway. Are there any special rule for that product?

Teamo, what is a hold down kit?

I also pre-ordered my 2011 version of the NEC code so i can start learning all the different rules. Im also thinking about taking the residential electrical class at my community college.

Jim Port 10-07-2010 08:17 PM

I answered about the orange conduit in your other thread.

The breaker hold down assures that the breaker remains in proper position and does not become loose on the buss connection. They normally mount on the foot side of the breaker.

a7ecorsair 10-07-2010 10:17 PM

Quote:

The subpanel will be a main lub (lug) type with a 80 amp breaker used as the main breaker instead of using the lugs to power the subpanel.
How will you connect the wire from the welder to the sub panel?

1982shawn 10-12-2010 10:14 PM

Jim, i will use the hold down kit. Extra precautions rarely hurt.

Corsair, i was planning on running it straight to its own breaker in the subpanel. Just like if i was wiring up an electric dryer.


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