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Mounting generator inlet box on outside wall

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Old 12-22-2011, 02:38:44 PM
DrCharles DrCharles is offline
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Question Mounting generator inlet box on outside wall

I am preparing to mount a "Connecticut Electric" rain-tight 30 amp generator inlet box on the outside of my garage wall. (It's this one, ebay 190599475791). The plan is to run the Romex through the back of the box.

The wall is covered with vinyl siding. What is the best way to keep water from running down behind the box and along the Romex, which would end up either inside the wall or inside the box? Caulk between the box and the siding? Cut out the siding just larger than the box, and trim around it? Use a watertight connector and caulk the hole where the Romex passes through the wall?

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Old 12-22-2011, 03:24:51 PM
Jim Rankin Jim Rankin is offline
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Default Re: Mounting generator inlet box on outside wall

I would calk the back of the box around the hole for the wire and screw it to the siding/sheathing beneath the vinyl. Then calk the top and sides while leaving the bottom open for it to breathe.
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Old 12-22-2011, 04:41:13 PM
Ed Sparks Ed Sparks is offline
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Default Re: Mounting generator inlet box on outside wall

What Jim said, & remember that vinyl siding has a bevel to it so that the bottom will stand off more than the top. In order to set your box plumb we usually place a light fixture block on the house with the siding cut and fitted around it with "J" channel and then caulk behind it with clear silicone.

This is the industry standard for installing these outside boxes.
You should be able to find the block [solid PVC ] at your local big box home center for about $ 12 .00.
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