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Zlinger February 7th, 2018 06:44 PM

Nema 4 bulkhead connector?
I have to pass some poly tube through the side of a control panel and maintain a Nema 4 rating. I have used bulkhead connectors many times before without having to worry about weatherproofing. It doesn't seem that any bulkhead connectors I have found are Nema 4. Anyone know of any? I have looked at Roxtec's stuff, but I am hoping to find a normal bulkhead connector with a gasket. Any help is greatly appreciated.

rupej February 7th, 2018 07:01 PM

Does it need to be NEMA rated for UL or code reasons, or are you just trying to make sure that no water enters the enclosure?

If the latter, going through the bottom of the enclosure is pretty foolproof.

jraef February 7th, 2018 07:09 PM

Do a search for the term "CGB connector", it's an old designation for a cord connector with a rubber compression seal originally made by Crouse Hinds (who is now part of Cooper / Bussman, who is not part of Eaton...) Over the years, CGB became a common industry term and a search for it will link you to pretty much all of the major suppliers now.

The difference between this and a Roxtec seal is that with Roxtec, you can get one seal for multiple cables / tubes etc., with CGBs it's one connector for one cable/tube (for the most part). Roxtec seals are also fire stops and rated for marine bulkheads (meaning pressure tight), that's why they are so much more expensive. But if you don't need all of that, they are often budget busters.

geofftheelectrician February 7th, 2018 07:19 PM

If jraef’s solution is something you would use, a current part number is a Thomas & Betts 2522 which has a 1/2” NPT thread and the rubber grommet with approx a 3/8” opening. If NEMA 4 is required, you can use a sealing ring T&B part 5302.

Cow February 7th, 2018 08:54 PM

I'd recommend a cord grip bushing like Jraef mentioned. You can add a sealing washer too if you need it.

Zlinger February 9th, 2018 03:58 PM

Thank you all for the great responses.

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