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Old 04-17-06, 09:00 PM
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New main feed

Hello guys,

I might need to be replacing my main feed to my house, long discussion a few threads down...

Anyways, I have a 200A panel in the house. I still want to use that main panel. Right now there is OO Aluminum, and if I rerun the wire, I'd consider spending the extra money on copper. The run from the meter to the house is ~75 feet.

Here's the questions:

1) For 200A, what gauge should I use. I've heard that 2G would work OK, but then from research it appears I would need OO.

2) What should be the burry depth for the wiring?

3) Can I run it in PVC conduit?

4) Am I crazy to consider copper for a supply?

Thanks!
 
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Old 04-17-06, 10:45 PM
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> I'd consider spending the extra money on copper.

It's either that or 4/0 Al.
2/0 Al is too small. Are you sure you don't have 4/0?

> For 200A, what gauge should I use? ... it appears I would need 00.

Correct 2/0 Cu or 4/0 Al are the minimum feeder sizes.
If you actually use 200A at once, you should consider 3/0 Cu.


> 2) What should be the bury depth for the wiring?
How deep do you want it?
Look at your situation and consider what you think would protect it. I recommend at least 3 or 4 feet. Have your friend use a 12" scoop on his hoe.
Make the run straight. Cover with cheap sand and warning tape.


> 3) Can I run it in PVC conduit?
Yes. That's the cheapest.
If you want to install it at NEC minimum depth, use RMC (steel).
It is much more expensive and has additional bonding requirements. But it is somewhat backhoe resistant.

> 4) Am I crazy to consider copper for a supply?
No. But usually you are better off with bigger aluminum.
In this case, your panels probably won't accept anything larger than 4/0.

Assuming you use 2" or 2.5" PVC, you'll need 225' of 3/0 or 4/0 THHN, 75' of #4 bare (stranded) Cu, and I suggest another 75' or whatever or #4 solid Cu outside the conduit as a GEC. 75' of bare copper in the ditch will help to dissipate lightning a lot better than any 8' ground rod.
 
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