Raintight Compression Fittings

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chris kennedy

chris kennedy

Senior Member
Location
Miami Fla.
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60 yr old tool twisting electrician
I searched the Forum yesterday and couldn't find a thread I remember.

My problem is concrete tight compression fittings for EMT not being raintight. I looked at Cooper and Bridgeport today, both say concrete tight.

Where do I find such an animal?
 
These are from ETP:

RaintightFamily.jpg


http://www.etpfittings.com/

I'm sure that other manufacturers make them too.
 
raider1 said:
Your welcome.

As Trevor pointed out, I am sure the other manufactures all make a listed raintight compression fitting.

Chris
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It suprises my my warehouse size supply house stocks 2 brands, neither is raintite.
 
It took a while for my supply house to start stocking the new UL listed raintight compression fittings. It took contractors getting called for not using the new fittings to get them to bring them in.:)

Chris
 
raider1 said:
It took a while for my supply house to start stocking the new UL listed raintight compression fittings. It took contractors getting called for not using the new fittings to get them to bring them in.:)

Chris
Click to expand...

I guess I've missed something. The old raintight fittings don't meet a new UL standard?
 
hardworkingstiff said:
I guess I've missed something. The old raintight fittings don't meet a new UL standard?
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That's correct Lou.

I have no idea why it is a concern though, we have to use "W" type conductors in a installation that requires raintight fittings any ways, we have to meet the requirements of 225.22, and we can even use FMC if it's installed properly, go figure. :-?

Roger
 
roger said:
and we can even use FMC if it's installed properly, go figure. :-?
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Good point.

It seems like a major case of boredom in the UL offices and they needed something to do.

Perhaps the NEC should remove the RT requirement for EMT.
 
I thought those new fittings were cool until I got some.

Problem was if the connector was wrench tight the rubber gasket would squeeze out of place. If the fitting is tightened just before the gasket is squashed out it's not tight enough. A movement in the pipe going into it will eather lossen it up or squish out the gasket.

I also don't like them because the gasket is a insulator. Yes the threads should be making contact but see problem 1 above.

My guess is these will be required for a while until someone with some pull figures out it's a bad design, and then they will be baned.
 
hardworkingstiff said:
Roger, when do we need to comply?
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358.6
358.42
225.22
314.15(A)

This still baffles me. As Roger stated we install thWn in these conduits.

See def. of raintight in Art. 100 "under specified test conditions" OK great:confused:
 
active1 said:
I thought those new fittings were cool until I got some.

Problem was if the connector was wrench tight the rubber gasket would squeeze out of place. If the fitting is tightened just before the gasket is squashed out it's not tight enough. A movement in the pipe going into it will eather lossen it up or squish out the gasket.

I also don't like them because the gasket is a insulator. Yes the threads should be making contact but see problem 1 above.

My guess is these will be required for a while until someone with some pull figures out it's a bad design, and then they will be baned.
Click to expand...

I agree. POS. May look good when you leave but go back after a month or two and the gasket on the connector is displaced and the locknut loose. The internal rings may be doing their job but a wipe of silicone after the connector is tight would be better at the box. Either that or everything enters the bottom and forget the rubber ring.
 
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