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Old 07-22-2016, 08:00 PM   #1
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Default Square Knockout seal?

Does anyone know of any square knockout seals? I have a square hole to seal up and using a round knockout seal isn't an option for the location. I've never seen one before, but figured it wouldn't hurt to ask.
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Old 07-22-2016, 08:05 PM   #2
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Does it have to be neat, or could you bolt on a 4" blank cover plate?
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Old 07-22-2016, 08:08 PM   #3
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Yes I needs to be neat. PLC inside cabinet and it's in a wash down area. really don't want to drill more holes in the side and make a "make shift" gasket. Welding a plate isn't an option either due to warping. just thought id ask around otherwise im going to reach out to an outside machinist vendor and have my own seals made up.
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Old 07-22-2016, 08:12 PM   #4
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Quote:
Originally Posted by Shocked101 View Post
Yes I needs to be neat. PLC inside cabinet and it's in a wash down area. really don't want to drill more holes in the side and make a "make shift" gasket. Welding a plate isn't an option either due to warping. just thought id ask around otherwise im going to reach out to an outside machinist vendor and have my own seals made up.
Gotcha. Sorry, I don't know of anything that will seal it, look good, and be square. Good luck.
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Old 07-22-2016, 08:14 PM   #5
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If and when you find someone, I'd love to see before and after pictures!
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Old 07-22-2016, 08:14 PM   #6
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Got a meter socket or 3r panel hub cover floating around? Slap that bad larry on there, rtv silicone around it, and nothings getting in.
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Old 07-22-2016, 08:15 PM   #7
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Meter socket hub closure seal
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Old 07-22-2016, 08:23 PM   #8
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What size is the hole? Hoffman makes these from 1/2 to 4" and they don't care what shape the hole is.

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Old 07-22-2016, 08:26 PM   #9
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I'd whip one up out of a little square of stainless in no time.
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Old 07-22-2016, 08:32 PM   #10
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Default Reund Peg, Square Hole?



Can it be round & big enough that covers the square hole? These are water-tight by Milbank and Hoffmann, and the Wiegmann is also oil-tight. Probably fine for wash-down...
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Old 07-23-2016, 03:47 AM   #11
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End caps/plugs for square steel tubing.

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Old 07-23-2016, 06:34 AM   #12
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You could knock-out the square hole to the closest size round knock-out seal.
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Old 07-23-2016, 02:15 PM   #13
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Quote:
Originally Posted by Shocked101 View Post
Does anyone know of any square knockout seals? I have a square hole to seal up and using a round knockout seal isn't an option for the location. I've never seen one before, but figured it wouldn't hurt to ask.
What is the size of this square hole that needs the cover?
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Old 07-25-2016, 04:13 PM   #14
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Quote:
Originally Posted by Shocked101 View Post
Yes I needs to be neat. PLC inside cabinet and it's in a wash down area. really don't want to drill more holes in the side and make a "make shift" gasket. Welding a plate isn't an option either due to warping. just thought id ask around otherwise im going to reach out to an outside machinist vendor and have my own seals made up.
Wash down implies NEMA / UL Type 4 or 4X. Assuming the box has that rating, or did before the square hole was made, whatever you use to seal that hole now will need to be rated as a Type 4/4X closure. The Hoffman plugs shown would be, and as mentioned, they don't really care if the hole beneath them is round or square, as long as the gasket covers the entire open area and seals against the enclosure. The machinist made or the square meter cover + RTV idea might technically work, but if it's going to be inspected, would not pass.

In the past, I have used the end closure plates made for NEMA 4X wireway and passed inspection, so long as the size works out because they only come in 4x4 or 6x6 sizes. Do a search for a Hoffman F44WPSS to see what it's like. But it would mean drilling 4 small holes for the SS screws in each corner to hold it down, it's not a clamp type of plate.
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