rigid conduit sealing

[knippelk]

any recommendations on sealant to use on service entrance conduit fittings

 

[Strathead]

any recommendations on sealant to use on service entrance conduit fittings

If you are talking about around the conductors inside the conduit, I recommend duct seal #31-601 or equal. I have seen spray foam, and that is probably not illegal, but I haven't done any research to find out if it has deleterious affect on the wire insulation. I prefer the duct seal because it comes back out easier.

 

[roger]

If you are talking about around the conductors inside the conduit, I recommend duct seal #31-601 or equal. I have seen spray foam, and that is probably not illegal, but I haven't done any research to find out if it has deleterious affect on the wire insulation. I prefer the duct seal because it comes back out easier.

I agree about the duct seal and I have looked into using a Dow spray foam product. I contacted Dow and they basically said their products have not been tested and are not listed for that use.

Roger

 

[oldsparky52]

I agree about the duct seal and I have looked into using a Dow spray foam product. I contacted Dow and they basically said their products have not been tested and are not listed for that use.

Roger

Isn't that the problem with using just about anything other than duct seal?

 

[petersonra]

I had an email exchange with one of the expanding foam people once. they claimed their product had been tested and did not have any deleterious effects on wire insulation.

 

[roger]

Isn't that the problem with using just about anything other than duct seal?

Actually I don't think duct seal is specifically listed for the purpose either.

Roger

 

[roger]

I had an email exchange with one of the expanding foam people once. they claimed their product had been tested and did not have any deleterious effects on wire insulation.

Did they offer to send you backup to their claim?

Roger

 

[petersonra]

Actually I don't think duct seal is specifically listed for the purpose either.

Roger

I think the code uses the words "identified" and "approved" rather than "listed" to describe the sealing means.

 

[petersonra]

Did they offer to send you backup to their claim?

Roger

long time ago. don't recall offhand where it went.

 

[petersonra]

I would point out however, that it is very common to insulate walls of homes with foam insulation right on top of NM cable.

 

[iwire]

Actually I don't think duct seal is specifically listed for the purpose either.

Roger

When I looked into duct seal before I found it was for dry locations only.

 

[gadfly56]

When I looked into duct seal before I found it was for dry locations only.

I wonder how they explain this:

"Seals around junction boxes, flashings and service entrances"

Emphasis mine, but straight out of their 2015 catalog.

 

[iwire]

I guess from the inside of the building?


http://www.gardnerbender.com/en/ds-130

Note the 'not for use outdoors' line.

I was pretty surprised to learn that as we always used it outdoors.

 

[gadfly56]

I guess from the inside of the building?


http://www.gardnerbender.com/en/ds-130

Note the 'not for use outdoors' line.

I was pretty surprised to learn that as we always used it outdoors.

Well OK, looks like we're talking about two different products. The one I'm looking at was from Ideal and is the product mentioned at #2.

 

[iwire]

Well OK, looks like we're talking about two different products. The one I'm looking at was from Ideal and is the product mentioned at #2.

I have been trying to find the info for that specific brand but will be surprised if it can be used outdoors either.