I want to install 3/4'' EMT but it will be outside. I want to do a LB to come out from the existing panel and go about 40 feet to a new sub panel but that side will need a LB also. I'm having trouble finding LB fittings that are listed rain tight. Is there something else I should be using in place of a LB? I usually just use pvc but it will be in a hot area and don't want it warping.
EMT rain tight fittings
- Thread starter crtemp
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To be completely compliant, use an [aluminum] RMC/IMC LB with a close nipple and a Bridgeport 291-RT or its equivalent.
On the other side, if going directly into a KO, use a close nipple with seal ring or sealing locknut on outside and standard rigid locknut on the inside.
On the other side, if going directly into a KO, use a close nipple with seal ring or sealing locknut on outside and standard rigid locknut on the inside.
Dang. Oh well
You'll be fine using an aluminum LB and screwing raintighht connectors into each end.
peter d
Senior Member
- Location
- New England
I agree, that's how I would do it.
jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
Oh please.
http://www.aifittings.com/catalog/emt/emt-rain-tight-compression-connectors/
I buy hundreds of these every month.
Jberg73
Member
Really, that's new to me. Last I knew there weren't any "rain tight" listed connectors that were approved by UL.
"manufacturers of UL Listed “raintight”
compression type EMT fittings
were required to comply with the
more stringent follow-up test re-
quirements. If the manufacturers
of these fittings did not comply
with the new requirements, they
were no longer authorized to mark
their UL Listed fittings with the
“Raintight” marking. Currently, no manufacturer is
authorized to mark their Listed
compression type EMT fittings
with the “Raintight” marking."
That was taken directly from UL's website.
Jason
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
That note about non UL listed raintight fittings is many years old. There are ample manufactures of raintight fittings available, what we use are steel compression and the gland nuts are a different color for raintight. We have boxes of them on our shelf, compression and connectors
One more quick question on using the EMT as the EGC. Do I just use a regular lock nut in the original panel or do I need to ground the EMT conduit with a bonding bushing of some kind? There will be a 90 amp OCPD so I wasn't sure if I need to ground the pipe with a #8. Again, sorry for dumb questions but I rarely ever use EMT.
No special requirements. I'd probably install an equipment ground but, that's just me.
- Occupation
- Licensed Electrician
Agreed just a regular lock nut, sinch it down good and tight so it breaks the paint.
There are almost no connectors listed for use with a threaded hub. They are not investigated for adequate grounding continuity. Connectors have straight threads. Threaded hubs have tapered threads and are intended for threaded RMC or IMC. There are combination conduit bodies listed for RMC, IMC, and EMT... but you will find they are only listed as raintight when used with rigid conduit.
It's not only possible it's true and has been for probably 15 years now. I think every EMT fitting manufacture has a listed raintight line.
Roger
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Note Washington state requires a wire type EGC in EMT outside (WAC 296-46B-358).
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