Transfer Box/Wire/Generator Question

Chriss123December 9, 2012

Hey everyone, I have a Briggs 8KW 10KW generator with a reliance 10 circuit transfer box that I plan to power most of my house with. My question/problem is the place that is best for the generator is 100ft away from the transfer box. Here is what is easiest, but I'm guessing is not best? I could just get a 100ft 10 gauge 4 prong (240/30amp) cable and run it right to the transfer box from the gen. Would this have too much loss for proper use? If I were to run the input box it would still be 50ft of 10/3 inside the house and then another 50ft of plug. If I use 8/3 on the 50ft run on the inside does this make it better? What do you guys suggest? Thanks

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Chriss123

Or should I just make a 8/3 100ft cord? I know its expensive, but I want it done right and safe.

    Bookmark   December 9, 2012 at 3:35PM
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Ron Natalie

You can make a cord. Note that cordage counts the ground so you need 8-4 (unlike cable which doesn't count the ground).

You can't run cord through the walls/structure, so unless the transfer switch is mounted exterior (or in the garage or someplace you can go through the door), you'll need to mount a inlet on the house and run approved interior wiring to the transfer unit.

    Bookmark   December 10, 2012 at 9:07AM
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Chriss123

Can I get away with 8/4 on the inside from the transfer switch to the inlet box and just do the rest (50ft) with a pre made cable of 10/4? Would this help with voltage drop vs doing everything in 10/4. Thanks

    Bookmark   December 10, 2012 at 4:54PM
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Ron Natalie

I think you mean 8/3. Cables don't count the ground again (cords do).

Yes, you can use cable inside the house (provided it is rated for interior use, I'm assuming you're talking about something like NM). Going up a wire size when you've got high currents over longer runs isn't a bad idea.

    Bookmark   December 11, 2012 at 9:24AM
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Chriss123

Your correct 8/3. I'm going to just make a straight 85-100 ft cable and run it directly from the gen to the transfer switch.

    Bookmark   December 11, 2012 at 8:25PM
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