Direct burial threadless coupling

[Roddick]

Hello
I will do soon a new power for EV car in detached garage.There is already 1" conduit underground.I found that almost at the house about 2 feet from the entry the pipe is blocked with dirt and mud so I cannot change the wires.I will cut pipe at this point and replace it with new piece of rigid pipe.Unfortunately I cannot make a thread so my question is if there is any direct burial threadless coupling I can use.Thank you.

 

[Todd0x1]

Hello
I will do soon a new power for EV car in detached garage.There is already 1" conduit underground.I found that almost at the house about 2 feet from the entry the pipe is blocked with dirt and mud so I cannot change the wires.I will cut pipe at this point and replace it with new piece of rigid pipe.Unfortunately I cannot make a thread so my question is if there is any direct burial threadless coupling I can use.Thank you.

Are you sure the pipe is continuous?

 

[readydave8]

cannot make a thread

Because of space? Or because don't have tool?

 

[electrofelon]

https://www.gordonelectricsupply.com/p/Topaz-256Srt-2In-Conduit-Coupling/6834794?text=256srt

 

[Roddick]

Are you sure the pipe is continuous?

Sure I have a threader.But concrete patio is just 1 inch aside.

 

[Roddick]

Are you sure the pipe is continuous?

Yes.House is 10 years old .

 

[infinity]

Sure I have a threader.But concrete patio is just 1 inch aside.

I don't think that you'll find a fitting listed for direct burial besides a standard RMC coupling that comes on the end of a length of pipe.

 

[electrofelon]

I don't think that you'll find a fitting listed for direct burial besides a standard RMC coupling that comes on the end of a length of pipe.

Does it need to be? 344.6 require fittings to be listed. 344.42 says:

Couplings and Connectors.
(A) Threadless. Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concrete tight type. Where installed in wet locations, they shall comply with 314.15.

I think if the fitting was listed as raintight/wet location that would be fine. I do not see any requirement that it be listed for use below grade or buried.

 

[infinity]

I think if the fitting was listed as raintight/wet location that would be fine. I do not see any requirement that it be listed for use below grade or buried.

So an aluminum wet location fitting can be buried underground? How long would that last covered in dirt? Maybe there are no aluminum fittings for steel RMC.

 

[electrofelon]

So an aluminum wet location fitting can be buried underground? How long would that last covered in dirt? Maybe there are no aluminum fittings for steel RMC.

I assumed steel fittings. Aluminum fittings might be restricted underground or require additional corrosion protection by various parts of 344.10

 

[infinity]

I assumed steel fittings. Aluminum fittings might be restricted underground or require additional corrosion protection by various parts of 344.10

I was just throwing it out there that a wet location listing might not automatically mean it is also rated for direct burial especially for a fitting made of aluminum or die cast. I know we had a thread a while ago about using an Erikson 3-piece coupling underground and whether or not it was permitted. Not sure if we ever reach a consensus on that.

 

[electrofelon]

I was just throwing it out there that a wet location listing might not automatically mean it is also rated for direct burial especially for a fitting made of aluminum or die cast. I know we had a thread a while ago about using an Erikson 3-piece coupling underground and whether or not it was permitted. Not sure if we ever reach a consensus on that.

I guess I would argue that unless there is a code section requiring listing/marking for direct burial/below grade, then there would be no restriction in using in such a way.

 

[busman]

I guess I would argue that unless there is a code section requiring listing/marking for direct burial/below grade, then there would be no restriction in using in such a way.

I know I've buried a few and never gave it another thought.

Mark

 

[don_resqcapt19]

The product standard does not even mention direct burial, but it does include ratings for the fitting to be concrete tight. All fittings listed for wet locations are also listed as being concrete tight. I don't think there is any issue with the underground compression connector as long as it is of the wet location type.

 

[infinity]

I think that this is one that fell through the cracks. Other areas of the NEC like certain ground clamps specify that they need to be rated for direct soil burial or direct burial.