On Tue, 04 Oct 2011 16:07:28 -0400, X ` Man
wrote:

I'm thinking of upgrading to a larger standby generator on our house,
probably a 17KW model.

The generator will be approximately 50 to 60 feet away from the house
circuit breakers. The wire will run under the main level floor and above
the lower level ceiling.

I want as little current drop as possible. The generator provides
100 amps.

One of the contractors under consideration wants to use aluminum wire,
but I am more than willing to pay the premium between aluminum and
copper. I don't have an electrical "handibook" available.

What I am wondering:

1. Is 4/0 copper wire heavy enough?

4/0 is severe overkill.

For 100 amps, #2 will give 3% voltage drop at 100 ft of 2-wire cable
(200 ft total lenght of conductor).

#2 copper is 0.162 ohms per 1000 ft

#4/0 copper os 0.0508 ohms per 1000 ft.


2. Anyone know a supplier for about 70 feet of the stuff?

Our local electrical suppliers don't seem to want to provide a length
that short.

Thanks.

OH...boating connection...with the genny, I'll be able to charge up boat
batteries even if the power company loses power... :)

--
Peter Bennett, VE7CEI
peterbb (at) telus.net
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca