Meyers/TA pvc
- Thread starter Cletis
- Start date
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kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
I will do it, but if you want to follow listings I think the meyers hub is for threaded RMC/IMC only.
mgookin
Senior Member
- Location
- Fort Myers, FL
- Occupation
- Retired inspector, plans examiner & building official
Are you saying PVC threads are not tapered NPT threads?
On a male adapter, yes.
mgookin
Senior Member
- Location
- Fort Myers, FL
- Occupation
- Retired inspector, plans examiner & building official
You just taught me something. After reading this post I went and picked one up off our shelf and sure enough.
Interesting.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
There is a guy named Mark Ode who works for UL that explained this PVC threads into a hub thing in a paper/article.
I will see if I can find it if someone does not provide a link before I do. Opened a few eyes, mine included.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
It was EMT, not PVC, but the fittings both have straight threads so it applies.
http://www.ecmag.com/section/codes-standards/fittings-hubs
MiElectrician
Member
- Location
- mi
I've always ran in EMT connector into an lb. How else would you use an lb with EMT?
Carultch
Senior Member
- Location
- Massachusetts
Example please. Most cases I've seen have tapered threads on both PVC gendered adapters.
Get an LB made for EMT.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Carultch
Senior Member
- Location
- Massachusetts
Is that acceptable in a wet location with raintight connectors in the setscrew LB?
NPSM male in NPSM female
Setscrews = mech/elec continuity
Gaskets = waterproofing
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Prolly not. I have never used EMT in an outside/wet location. Never in my specs. RMC (metalic or PVC) only.
EMT conduit bodies do not have threaded entries.
There are combination RMC, IMC, EMT conduit bodies with threaded entries, but they are only listed for wet locations when used with RMC, perhaps IMC.
Using any connector with straight threads in a threaded entry is a listing violation. There are some (very few) connectors made and listed that have NPT threads that you can use, but typical connectors have straight threads.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Those threaded LBs with setscrews are combo devices. Can be used with either threaded conduit or EMT. The setscrew is for EMT, not to crank down on the pipe threads.
Use a raintight compression EMT connector with sealant same as you would with a Bell box. That's all you can do and it's compliant. However if this were a really wet location (like exposed to rain or washdown) I wouldn't use EMT to begin with.
-Hal
Use a raintight compression EMT connector with sealant same as you would with a Bell box. That's all you can do and it's compliant. However if this were a really wet location (like exposed to rain or washdown) I wouldn't use EMT to begin with.
-Hal
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Some are, but not all. I have seen both types.
hbiss
EC, Westchester, New York NEC: 2014
- Location
- Hawthorne, New York NEC: 2014
- Occupation
- EC
Dunno about that. I didn't look up any conduit bodies but this is from the Raco/Bell catalog Bell box description: Hubs accept all threaded fittings and threaded conduit.
-Hal
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
If you are quoting Smart$, then that is not what he wrote. You edited it and that is misleading.
He wrote:
Using any connector with straight threads in a threaded entry is a listing violation.
Out of curiosity, I did verify that statement is on their data sheet and the boxes are UL listed. I'd have to research the entire chain of listings to say "I am wrong" for certain. The reason I assert using a connector (metal, with straight threads) is a listing violation is because the UL Whitebook states something to the effect that fittings with straight threads inserted into hubs with tapered threads have not been investigated to provide adequate grounding. It has been a few, perhaps several years, so perhaps it has changed. Anyone know?
Oh, BTW, the reason I mentioned straight threads on a PVC male adapter wasn't because of grounding (obviously). Rather that's about retaining a wet location rating for the enclosure. While PVC itself is wet location rated, you'd have to use a sealing washer or sealing locknut to maintain a wet location rating for the enclosure... and that would only be compliant when connecting directly to the enclosure... so there's no purpose for using a Myers hub.
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