750mcm Aluminum Xhhw-2 600V XLPE Insulation Xhhw-2 Service Wire

XHHW Wire Overview

XHHW is an alphabetism or initialism which stands for "XLPE (cross-linked polyethylene) High Heat-resistant Water-resistant." XHHW is a designation for a specific insulation material, temperature rating, and condition of use (suitable for wet locations) for electrical wire and cable.

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. This type of insulation is used for both copper and aluminum conductors which are either solid or stranded, depending on size.

According to Underwriters Laboratories (UL) Standard 44, XHHW insulation is suitable for use in dry locations up to 90° C (194° F), or wet locations up to 75° C (167° F).

XHHW-2 insulation, which is similar to XHHW, is suitable for use in dry or wet locations up to 90° C (194° F).

XHHW / XHHW-2 electrical conductor insulation is governed by the following Industry Standards: 

• UL 44
• CSA c22.2. No38
• ASTM-B3
• ASTM-B8
• ASTM-B800
• ASTM-B801
• NFPA 70 -2008 (NEC code)
• U.S. Federal Specification J-C 30B
• NEMA WC70/ICEA S-95-658

Conductors: Compact soft drawn bare 8000 series aluminum, with Class B stranding per ASTM.
Insulation: Abrasion, heat and moisture resistant cross-linked polyethylene insulation (XLPE), low coefficient of friction, "slippery" or "slick" material. It is available in ten solid colors.

All values are nominal and subject to correction
* Ampacities for not more than three conductors in raceway, based on ambient temperature of 30ºC per Table 310-15(B)(16) of the 2017 National Electrical Code

The different letters in XHHW wire denote particular properties of the cable:

X for Cross-Linked
HH for High Heat-Resistant, and
W for Water Resistant.

These characteristics along with the wide range of sizes make XHHW an ideal choice for residential, commercial, and industrial buildings, as well as for installations of many types.

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