Generator transfer switch wiring


Old 11-20-17, 11:24 AM
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Generator transfer switch wiring

I'm going to install a Generac transfer switch (model 6408) and the power inlet box that came with it. I have a question about the inlet box wiring. This is for a 30A circuit.

There is an existing hole in the side of my house where a propane line used to be. It's about 1/2", and I'd like to use it. Since it's a bit low to the ground, I am planning on putting the inlet a foot or two above it and running cable in flexible PVC conduit from the box, through the hole, and into the basement. Then once in the basement, I'd terminate the conduit and cable at a junction box and convert it to 10/3 romex.

1. Is flexible PVC the right kind of conduit to use? To be specific, this is the one I'd been looking at:

1a. What size conduit should I use?

2. I understand that there are concerns with overheating when you put Romex in a conduit. So, I'd been planning to use 10 gauge individual THHN wires in the conduit - is this the right approach?

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Old 11-20-17, 11:39 AM
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That flex conduit will work fine but remember... it's doesn't make right angle turns. It makes gradual sweeps. It may not fit as tightly to the house as you want.

Might be just as easy using 1/2" PVC conduit and an LB at the hole in the wall.

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Four #10 THWN wires are ok in 1/2" conduit.
If you were to pull cable in a flexible conduit..... it would need to be 10-3UF w/ground which would require a 3/4" or even a 1" conduit.
Old 11-20-17, 12:19 PM
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Ah, great point. Thanks! I'll do that.
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