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jtd771 11-11-2012 08:50 PM

Generator Inlet box
Complete noobie here with a question. I've purchased a 8kw generator and am planning to connect it to my panel with an interlock (will have a licensed electrician do this as part of my panel's replacement and upgrade of service to 200 amp). The generator has a 30 amp output. I am looking at inlet boxes online and they seem to say they are sized for 30 amps for generators up to 7.5kw. Wouldn't the breaker on my generator limit the same 30 amp outlet as a 7.5 kw generator's 30 amp let? For that matter, if my generator was 12kw but had a 30 amp connection wouldn't it still be limited? I am not understanding why the generator's total output matters to the inlet box if the output connection I am using is limited to 30 amps?

Sorry if I am missing something obvious or if this questions been asked a ton of times before.

k_buz 11-11-2012 08:52 PM

The inlet is rated to handle up to 30A. The inlet doesn't protect anything except the type of cord plugged into it. The generator itself, or the breaker its feeding will protect against overload.

jtd771 11-12-2012 05:27 AM

So my thinking is sound and that the generator's size doesn't matter as long as I am not connecting to an outlet with more than 30A of capacity?

J. V. 11-12-2012 12:11 PM

You size the inlet and the wiring to the generator output. In your case its a 30 amp twist lock. So you buy a 30 amp inlet and install a 30 amp breaker in the panel. You will use a 10/3 cord and plug. You can buy them already made up and ready to be plugged in.

jtd771 11-12-2012 07:02 PM

From the inlet box to the panel is about 40 feet. Should I use 10/3 or 12/3 for the inside wiring?

jbfan 11-12-2012 07:16 PM


Originally Posted by jtd771 (Post 1050703)
From the inlet box to the panel is about 40 feet. Should I use 10/3 or 12/3 for the inside wiring?

10/3 to match the 30 amps.

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