400A service with (2) 200A panels

[AC\DC]

Shouldn't the washer be on the outside?

maybe but why would orientation matter its sealing the hole correct?
when you torque that nut down it pulls the ta tight and then that washer fills in voids. I don't see were it matters.
3v1 so I bet I am wrong

 

[Seven-Delta-FortyOne]

If the conductors are #4 or larger, the bushing is required, PVC or not.

So you would not say that a standard PVC male terminal adapter complies with 300.4(g)1?

 

[Little Bill]

maybe but why would orientation matter its sealing the hole correct?
when you torque that nut down it pulls the ta tight and then that washer fills in voids. I don't see were it matters.
3v1 so I bet I am wrong

IMO, it would do a better job on the outside.

 

[AC\DC]

So you would not say that a standard PVC male terminal adapter complies with 300.4(g)1?

No they are not a "smoothly rounded insulating surface" not jagged but not smooth

 

[Eddie702]

I would put them in anyway but if an EMT conductor with the insulated throats do they need bushing?

Insulated throats are fine with no bushing.

 

[Seven-Delta-FortyOne]

But what if the manufacturer has “identified” it as having a “smoothly rounded insulating surface”?

Or what if it identifies itself as having a “smoothly rounded insulating surface?”

I should probably stop…..

 

[Little Bill]

So you would not say that a standard PVC male terminal adapter complies with 300.4(g)1?

No, the PVC has sharp edges.

 

[Greentagger]

So you would not say that a standard PVC male terminal adapter complies with 300.4(g)1?

352.46 may be what you are looking for.

 

[Eddie702]

I never used sealing locknuts but I would think the washer should be on the outside like a LMFC connector.

 

[Seven-Delta-FortyOne]

OK went out to the truck and took a close look.








There’s a little bit of difference, I’ll admit….

 

[Little Bill]

OK went out to the truck and took a close look.

View attachment 2572196



View attachment 2572197


There’s a little bit of difference, I’ll admit….

I've had enough discussions with an inspector to know about PVC requiring a bushing with larger conductors. This one has been making people put bushings on NM clamps! He's wrong but I haven't had to deal with him on this directly.

 

[LarryFine]

No, the PVC has sharp edges.

"VERY sharp edges, sir!"

 

[Seven-Delta-FortyOne]

You’re on fire, Larry.

 

[RdmanElect]

What’s in your picture is a bushing. It’s for wire protection, which, incidentally, I don’t usually use on PVC conduit.

The sealing washer Don is talking about is the (usually) yellow washer, like what is on a LFNC connector.

You gotta look closely behind the locknut, you'll see the blue sealant that comes sealed to the lock nut

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[RdmanElect]

IMO, it would do a better job on the outside.

It would be weird to use with a PVC connector on the outside

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[Little Bill]

It would be weird to use with a PVC connector on the outside

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How so? No different than a Meyers Hub or any other seal. That protects the first point of entry should water try to come through.

 

[jaggedben]

YMMV but I find that with connectors, which are not designed to have a lock ring on the outside of the enclosure, putting a sealing lock ring on the outside leaves not enough threads left on the inside. While I usually put sealing lock rings on the outside (on rigid nipples), I think what the OP has done is an acceptable solution that meets code.

 

[Little Bill]

YMMV but I find that with connectors, which are not designed to have a lock ring on the outside of the enclosure, putting a sealing lock ring on the outside leaves not enough threads left on the inside. While I usually put sealing lock rings on the outside (on rigid nipples), I think what the OP has done is an acceptable solution that meets code.

Other than maybe a PVC box with thicker walls, I've never encountered an enclosure where a terminal adapter, or male adapter, as some call them, didn't come through enough to put a locknut and bushing on and have room after that. There is over a half inch of threads there after the locknut is on. Putting a sealing washer on the outside wouldn't lesson the thread exposure enough to prevent a locknut and bushing.

 

[don_resqcapt19]

What’s in your picture is a bushing. It’s for wire protection, which, incidentally, I don’t usually use on PVC conduit.

The sealing washer Don is talking about is the (usually) yellow washer, like what is on a LFNC connector.

The Carlon one is black, but I think their instructions call for it to be on the outside.

 

[don_resqcapt19]

maybe but why would orientation matter its sealing the hole correct?
when you torque that nut down it pulls the ta tight and then that washer fills in voids. I don't see were it matters.
3v1 so I bet I am wrong

Because of the larger surface area of the connector that will be in contact with the surface of the flat sealing washer. The flat sealing washer is not intended to seal the threads like a sealing locknut is.