XLPE Conductors

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XLPE is the insulation material -cross-linked polyethylene. It’s not a wire type. If you search, I think you’ll find a recent thread where this was hashed out. I don’t recall all the details.
 
Yeah the insulation thickness will vary based on the conductor type and size. For example USE is thicker than XHHW, IIRC it's like 80 mills vs 55 mills respectively, For 4/0size.

Also, note the tables are there for your convenience and I believe the actual dimensions will take precedence over any table value. Some types such as compressed stranded and PV wire are not even listed, you have to look it up or measure them
 
If the conductor type is not shown in Table 310.104 or in 310.4 for the newer codes, it cannot be used for an NEC application.
 
retirede said:
XLPE is the insulation material -cross-linked polyethylene. It’s not a wire type. If you search, I think you’ll find a recent thread where this was hashed out. I don’t recall all the details.
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This is correct, XPLE is the material, Cross-lined polyethylene, the cable type is going to be XHHW and in some cases, RHH/RHW-2. The X in XHHW is for XPLE. The R in RHH/RHW was originally rubber, but increasingly because the cost of real rubber has skyrocketed, they are using a form of XPLE as well. Both RHH/RHW and XHHW are in the NEC as approved wire types.

Cross-linked polyethylene is essentially heat shrink tubing. It is formed as a continuous tube, irradiated to make the polymer strands link to each other, then heated up and expanded. Then the wire is pushed through it, it is heated again and the linked strands try to return to its original shape and size, gripping the wire. This insulation method is better than PVC, which is molded onto the wire as a liquid and cured with heat, but the liquid can contain "bubbles" that can lead to failure over time. That's why you often see XHHW rated for 1,000 or 2,000V instead of just 600V and why it is the preferred cable for the output of VFDs.
 
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According ANSI/UL 44/2002 the insulation material for XHHW-2, XHHW and XHH may be XL or EPCV XTHH insulation material.jpg and in ANSI/UL 1580 are the details
 
Sorry, it is UL 1581 [not UL 1580]

it is UL Reference Standard for Electrical Wires, Cables, and Flexible Cords
 
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