The 14 XHHW-2 copper building wire has a variety of uses that are outlined in the National Electrical Code 1. This versatile wire can be used in a number of different environments, too. XHHW, which stands for Cross-Linked High Heat Water Resistant means that the wire’s insulation has both of those properties—it is water and high heat resistant, so the wiring itself is well protected.

This wire meets or exceeds a number of different standards, including UL Standard 44, NEC, c(UL) Type RW90, Federal Specification A-A-59544, and ICEA 2-95-658 / NEMA WC70. It is also OSHA acceptable.


This type of wire is made from annealed copper for efficient electricity conduction. The copper used in this wiring meets the standards for ASTM B3 and ASTM B8. The insulation used in XHHW-2 wire is made from a special cross-linked polyethylene (XLPE) to make it very flame resistant—if the wiring were to catch on fire, the flames would not be able to get out of the insulation to spread throughout the building. This insulation also keeps all moisture out of the wiring and protects the wiring from direct sunlight.

14 XHHW-2 copper building wire has an AWG size of 14 and features 7 individual strands. It has an insulation thickness of 30 mils and a nominal O.D. of 130. It weighs about 18 pounds per 1,000 foot of cable. In addition to size 14, it’s also available in larger and smaller sizes. The wire can be purchased in a variety of colors to make color-coding projects very easy.

The allowable ampacity of this wire is 15 at all three standard temperatures (60, 75, and 90 degrees Celsius).


14 XHHW-2 copper building wire is often used, as the name suggests, in commercial, industrial, or residential buildings. It is often used in conduits and other raceways for feeders, branch circuit wiring, and services as outlined in the National Electrical Code. These conductors can be used in a variety of locations, both wet and dry. However, this wire should not be used in any location where the temperature exceeds 90 degrees Celsius on a regular basis.

This type of wiring is most often used in industrial areas that need wiring that can conduct a large amount of power while also being very durable and tough. The fact that it is flame retardant is another big reason for using this type of wiring, especially since the insulation jacket will keep most flames inside the wiring. Buildings that make use of 14 XHHW-2 wiring are less at risk of an electrical fire. Because the insulation is also water-resistant, this is a good choice for use in areas that are damp or where the wiring may be exposed to water on a regular basis.

The maximum voltage 14 XHHW-2 copper building wire is rated for is 600 volts. Because XHHW-2 wiring often actually exceeds many of the industry standards for wiring used in buildings, it is often used in applications where quality is highly sought after.

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