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Old 10-05-2012, 10:21 AM   #16
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Bending 2" Rigid Conduit


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Originally Posted by wewantutopia View Post
Future proofing. We plan on a PV array in the future. Also, possible sub panel to the garage for electric vehicle charging (in the future). Or who knows what the future will bring with the ever increasing electronic world.

If I'm doing it, I'm going to do it in a manner that requires no rework in my lifetime.

Inspector requires the rigid, I'm electing to use the 3/0 (not required by the inspector but a suggestion).
Using 3/0 is NOT going to future proof anything. It won't make any difference with a PV system nor will it allow any "increase for the electronic world". It's a waste of money.

As for the pipe, are you sure that you are required to use Rigid Metallic Conduit? I would talk to someone else in your building department first and ask for your local amendments on paper.
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Old 10-05-2012, 09:15 PM   #17
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Bending 2" Rigid Conduit


Doesn't 3/0 over 2/0 allow you to actually pull 200 amps?

Also, there is absolutely NO pvc used for overhead anywhere around here. No SER either. Everything is in rigid.
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Old 10-05-2012, 09:48 PM   #18
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Bending 2" Rigid Conduit


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The benders used by muffler shops use a tighter radius and won't comply the NEC.
You'll need to point me to the article, I can't seem to find it.
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Old 10-05-2012, 09:53 PM   #19
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Bending 2" Rigid Conduit


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Originally Posted by wewantutopia View Post
Doesn't 3/0 over 2/0 allow you to actually pull 200 amps?

Also, there is absolutely NO pvc used for overhead anywhere around here. No SER either. Everything is in rigid.
You really hope you don't pull 200 amps on a consistant basis.
Your electric bill will be through the roof.
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Old 10-05-2012, 10:02 PM   #20
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Bending 2" Rigid Conduit


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You really hope you don't pull 200 amps on a consistant basis.
Your electric bill will be through the roof.
Of course not, but like I said earlier in the thread we don't know what the future brings. Who knows how much electric vehicle charging on ultra fast chargers will draw for example.

Will anyone else comment on advantage of 3/0 over 2/0?
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Old 10-05-2012, 11:29 PM   #21
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Bending 2" Rigid Conduit


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Originally Posted by Gac66610

You'll need to point me to the article, I can't seem to find it.
There's nothing in the codebook that says "muffler pipe benders bend too tight" its common knowledge for tradespeople that the bend radius on the shoe is too small.
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Old 10-06-2012, 05:48 AM   #22
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Bending 2" Rigid Conduit


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Originally Posted by wewantutopia View Post
Will anyone else comment on advantage of 3/0 over 2/0?
There is 0 (zero) advantage to pulling 3/0's. In fact, 3 3/0's fit just fine in an 1 1/2" conduit.
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Old 10-11-2012, 09:30 PM   #23
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Bending 2" Rigid Conduit


Thanks everyone for all the replies.

The only reason I was persistent about the 3/0 wire is that the inspector said that "2/0 is code and just fine but builders around here usually use 3/0..."

I figured there had to be a reason since it costs extra $.
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Old 10-12-2012, 06:55 AM   #24
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Bending 2" Rigid Conduit


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Originally Posted by andrew79 View Post
There's nothing in the codebook that says "muffler pipe benders bend too tight" its common knowledge for tradespeople that the bend radius on the shoe is too small.
Thanks Andrew

I should have phrased my response different. A muffler shop bender would be fine as long as the radius meets NEC requirements. Additionally, welding is not an acceptable means of connecting RMC.
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