EMT Raintight Connections

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Old 01-28-18, 07:47 PM
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EMT Raintight Connections

Evening all,

I need to run a circuit to an a/c disconnect on the side of my house. I have conduit running on the ceiling and then need to take it through the wall and down the outside of my house to a disconnect.

If you look at the drawing below, I am wondering if the connection between the emt nipple and the LB is raintight. You can see a picture of what I have on hand below the drawing.

If you happen to notice anything incorrect in the drawing I'd love to know that as well

Thanks for you help.



 
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Old 01-28-18, 08:36 PM
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Yes.... the threaded nipple to the LB is considered raintight.
 
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Old 01-29-18, 06:17 AM
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Originally Posted by PJmax View Post
Yes.... the threaded nipple to the LB is considered raintight.
Thanks. Do you see any issue running EMT on the outside or should I use PVC?
 
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Old 01-29-18, 09:16 AM
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EMT above grade is ok.
Not sure I see a good reason, though for the single plece of PVC in your proposal. That exact el is avail in metal, which makes the entire run bonded. Now, you MUST use a grounding conductor.
And, you DON'T want a pvc el on both ends on EMT, because you would have a floated wireway of ungrounded metal, even with a grounding conductor used.
 
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Old 01-29-18, 10:39 AM
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Have you thought about avoiding the issue entirely by running the conduit down the inside of the garage wall and into the back of the AC disconnect?
 
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Old 01-29-18, 11:00 AM
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If you happen to notice anything incorrect in the drawing I'd love to know that as well

What you are calling an "EMT Coupler" is a galvanized rigid coupling. What you call "Threaded EMT Nipple" Is a galvanized rigid conduit nipple, EMT conduit cannot be threaded.
 
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Old 01-29-18, 02:47 PM
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Sorry to threadjack. If I am not using threaded pipe to insert into the EMT LB (Conduit Body), what are my options for connecting EMT to the conduit body for an outdoors application where I need it to be watertight? I see watertight compression connectors, but they look to thread into boxes and have a backing ring applied. Can I just remove the backring and thread that directly into the conduit body?

Thanks for any help - Wil
 
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Old 01-29-18, 04:10 PM
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Yes.... you don't need to use the locknut when you use the connector in a threaded fitting. If you need a 100% weather seal.... use a little pipe dope on the threads before putting it into the fitting.
 
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Old 01-30-18, 05:53 AM
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YesHaveSome just curious. Maybe you do know this already but just figured I would mention it.

What type of conductors are you running from the inside to the outside and into the disconnect for the A/C? I know your question did not ask this but it is important to know for sure if you used the properly rated conductors for use inside conduit.
 
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