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clasact 05-15-2009 08:07 PM

electric upgrade conduit
I am haveing an upgrade done and was told to get 4inch schedal 40 coduit,is that an item that come stright from an electrical supply house?I checked the box stores and they say they only have 2 or 3 inch.It will carry 350 wire for a 400 service

kbsparky 05-15-2009 08:30 PM

Who told you to get such a monstrocity of a conduit? :huh:

You can easily install a 400 Amp service with a 2" or 3" conduit .... :whistling2:

BUT, 350 ain't nearly enough for 400 Amps .... even using copper!

Are you dealing with a power company person on a power trip?

micromind 05-16-2009 12:48 AM

There's a good possibility that this is a POCO requirement. Around here for a 400 amp single phase service they require two 4" conduits. One for their wire, and one spare. They pull two 350 AL, and one 4/0.

I realize that you or I could get this in a 2-1/2", with 4-90's, but the POCO around here has become a bunch of panzies lately. Even with a grossly oversized conduit, they will allow only 3-90's.


clasact 05-16-2009 05:09 AM

It is the poco telling me that is what I need to put in.I thought I was getting a deal since they said that since I let them know I was upgradeing and willing to move my box they would put me on my own transformer and put all the new wire in at no charge.all I have to do is dig the trench and lay the conduit,im just not sure where you get the 4 inch that they said to put in.I kind a want to do it their wat since otherwise it could cost me a butt load of money.I am assuming it 4 inch makes it easy to oull that size wire?

Speedy Petey 05-16-2009 07:48 AM

4" PVC is available at any real electrical supply house.

Speedy Petey 05-16-2009 07:50 AM


Originally Posted by kbsparky (Post 274202)

BUT, 350 ain't nearly enough for 400 Amps .... even using copper!

Wow. That sucks for you. That's all I would ever use.

Aren't you allowed to use 310.15(B)(6)?

This is residential remember. It is a 320/400A service. The conductors only need to be sized for 320A.
350MCM cu is good for 350 amps.

rgsgww 05-16-2009 08:12 AM

When I had to have my service changed over to 4 inch conduit, the poco used two 350s and 1 4/0 neutral.

It used to be paralleled wires, though, I forget the size.

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