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Old 08-19-2011, 09:46 AM   #1
I ask the impossible!
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Service entrance wire

When last I posted here, I had finally got my rough inspection passed:

Today, just short of 2 months later, the POCO finally moved their connection to my new service entrance.

I have a question though... I'm using 4/0 aluminum for everything going to the panel as required by code, as I understand it. And I knew to expect that an overhead line can be smaller. But my 4 gauge solid aluminum wire that was being used when I had 100 amp service is the same wire that they moved over and connected to the 200 amp service.

(I think it's 4-gage, I only really had a tape measure on hand for measuring, so I measured the wire as being about 3/16" diameter. That's wire without insulator, with the insulation it was 5/16" and I could see it was solid and not stranded.)

I've read elsewhere of 1/0 being used for 200 amps, and that this is the POCO's jurisdiction and isn't covered by NEC... And I know that overhead wire can be smaller because it gets more cooling from air that can be moving, but this is a huge difference in size and I can't help feeling a little uncertain as to whether this is really right...


Please do NOT consider any "before" picture of my house as any kind of endorsement of any particular construction method. In fact, you should probably assume that if I post a "before" picture, I am posting it because I am soliciting advice on a proper replacement for one of MANY things done wrong by a previous owner.

Last edited by WillK; 08-19-2011 at 09:48 AM.
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Old 08-19-2011, 09:57 AM   #2
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Service entrance wire

It is just the way it is. Power company is under NESC. They could probably use a #10 for the supply and get away with it. Forget about it.


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