What Does Xhhw 2 Stand For

What is difference between XHHW and XHHW-2?

THHN/THWN-2 is a thermoplastic product, while XHHW-2 features thermoset insulation.


T = Thermoplastic X = Cross-Linked Polyethylene (XLPE)
HH = High Heat Resistant HH = High Heat Resistant
W = Water Resistant W = Water Resistant
N = Nylon Jacket (Not Required)

What is XHHW wire rated for?

XHHW-2 is rated up to 90° C in both wet and dry environments. THHN is rated up to 90° C in dry environments only. Dual-rated THHN/THWN carries a 75° C wet-environment rating. The 0.004” nylon jacket on the THHN is hydroscopic (that is, it absorbs moisture), which prohibits its use in wet locations at any temperature.

What is XHHW-2 wire used for?

XHHW-2 wire is the next generation XHHW wire. While its main use is for residential, commercial and industrial buildings, it is also used in raceways, feeder and circuit wiring. XHHW-2 is approved for use up to 600V and is UL Listed for 90° C (194° F), in both dry and wet locations.

Is XHHW better than Thhn?

Even though its jacket is thicker and more protective, XHHW is also more flexible than THHN wire. The XLPE insulation of the XHHW allows the cable to bend and flex better than the THHN's PVC insulation—so XHHW is much easier to work with during the installation process.

What does the 2 in THWN 2 stand for?

THWN stands for Thermoplastic Heat and Water-resistant Nylon-coated. THHN stands for "Thermoplastic High Heat-resistant Nylon-coated". THWN-THHN-2 wire is one of the most common single conductor wires used in the United States.

Is XHHW wire sunlight resistant?

A: Yes. Black XHHW-2 Conductors sizes 8 AWG and larger are marked “Sunlight Resistant.”

Is XHHW flame retardant?

The tough insulation is heat, chemical, oil and moisture resistant, flame retardant and can withstand harsh conditions.

What Thhn stands for?

THHN stands for Thermoplastic High Heat-resistant Nylon-coated.

What is the diameter of #2 aluminum wire?

Aluminum Wire

AWG Diam. (mils) Pounds/1000ft
2 258 61.0
3 229 48.4
4 204 38.4
5 182 30.4

What is #2 copper wire rated for?

Related Resources

Size Temperature Rating of Copper Conductor
(AWG or kcmil) 60°C (140°F) 90°C (194°F)
3 AWG 85 115
2 AWG 95 130
1 AWG 110 145

Is Romex a Thhn?

Romex wire is made out of two or three THHN wires combined with a grounding bare copper wire. Like the THHN wires, Romex wire can't be used outside because of its minimal PVC jacket protection.

Where is XHHW used?

XHHW Wire Overview

Wires with XHHW insulation are commonly used in the alternating current (AC) electrical distribution systems of commercial, institutional, and industrial buildings and installations, usually at voltage levels (potential difference or electromotive force) ranging from 110-600 Volts.

Can you bury XLPE?

Resistant to tear and abrasion. Suitable for direct burial. Used for secondary distribution and underground service at 600 V or less. May be used in ducts or direct burial.

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