XLPE

[nizak]

Is Type XLPE insulation not recognized by the NEC?

I’m trying to find it for conduit fill and don’t see it in any of the tables.

Thank you.

 

[electrofelon]

Is Type XLPE insulation not recognized by the NEC?

I’m trying to find it for conduit fill and don’t see it in any of the tables.

Thank you.

Not if that's all it says. No other markings like XHHW or USE?

 

[nizak]

Not if that's all it says. No other markings like XHHW or USE?

That’s what’s listed in the Mfgrs cut sheet. Don’t have the actual wire in front of me.

Trying to determine if I can get 3- 250 MCM and 1 -3/0 conductor in a 2” EMT.

Will be used as a 4’ sleeve , not pulling through a complete run.

Only have 2” knockouts to work with on disconnects.and need to protect where it emerges from the ground.

 

[electrofelon]

That’s what’s listed in the Mfgrs cut sheet. Don’t have the actual wire in front of me.

Trying to determine if I can get 3- 250 MCM and 1 -3/0 conductor in a 2” EMT.

Will be used as a 4’ sleeve , not pulling through a complete run.

Only have 2” knockouts to work with on disconnects.and need to protect where it emerges from the ground.

You could run the calc with type USE, as that would be the thickest insulation. If it's aluminum, then of course it's probably compact, but it might be compressed stranded also which is going to be a little larger.

 

[electrofelon]

Looks like it fits with xhhw, but not RHH/USE

But if it's just a sleeve I think you're fine with either.

 

[nizak]

Looks like it fits with xhhw, but not RHH/USE

But if it's just a sleeve I think you're fine with either.

All gonna depend on what the conductors are marked as.

Plan B is to go with 4/0 and accept the VD difference between the two.

 

[electrofelon]

The 40% conduit fill does not apply to a sleeve so I think you are fine. Just another question, seems a bit odd to use EMT for this. And if you are worried about size, why not just punch it out to 2.5"?

 

[nizak]

The cans I have are factory furnished with 2” KO’s.

Not enough physical space to punch to 2 1/2” and get a locknut on it.

 

[electrofelon]

Could maybe use something like this:

Carlon® 2" PVC Slip Meter Riser

The Carlon® 2-inch PVC Slip Meter Riser provides a fast and easy transition from underground services to the electric meter.

www.menards.com

They are meant to be used as expansion couplings and slip over a piece of 2-in, but most I have seen are actually made of 2.5" inch PVC so you could just glue up a 2.5" coupling to it.

Or simply use a reducer just below the cabinet.

 

[nizak]

Thanks for the suggestions.

 

[LarryFine]

XLPE is an insulation material, but not a conductor type.

Why use 2.5" if you're going to reduce it to 2" anyway?

2" EMT is fine for your wires with the nipple allowance.

 

[Julius Right]

NEC does not detail the insulation material but only the name and properties.
These details are in UL-44 Standard for Thermoset-Insulated Wire and Cable
See Table 5.1 for details.
The details for XL and EPCV are explained in UL 1581 Reference Standard for Electrical Wires,Cables, and Flexible Cords
That means NEC recognized at XLPE as insulation material.

 

[Dennis Alwon]

I found this on the net for performance brand. I bet other companies do the same

Performance Wire and Cable utilizes XLPE insulation on USE-2 wires, RHW-2 cable, and RHH cable.

This from Southwire

 

[Jraef]

All RHH/RHW and XHHW conductor types now all use XLPE insulation. RHH originally stood for "Rubber High Heat", but they stopped using natural "rubber" decades ago, XLPE is considered a "synthetic" rubber substitute.