Product Information

Specification

250 MCM XLP USE-2 RHH RHW-2 Copper Building Wire

Ampacity Rating:

• In Free Air (90°C): 350 Amps
• In Raceway or Direct Burial (90°C): 290 Amps

Also Known As: 

250 XLP USE-2 RHH RHW-2 Copper Building Wire, 250 Copper RHH Wire, 250 Copper RHH Cable, 250 Direct Burial Electrical Cable, 250 Direct Burial Power Cable, 250 Direct Burial Service Entrance Cable, 250 Underground Service Entrance Cable.

Description

This 250 MCM copper building wire is a high-capacity electrical conductor with multiple ratings—RHH, RHW-2, and USE-2—designed for commercial, industrial, and high-power residential applications. It is suitable for both wet and dry locations, with a 90°C maximum operating temperature in either environment. The USE-2 rating makes it ideal for direct burial and underground service entrance applications.

With a 600V rating, this wire is commonly used in power distribution, feeder circuits, photovoltaic connections, raceways, and aerial installations. It is also suitable for conduit installations per NEC specifications. The annealed soft copper conductor provides excellent conductivity and flexibility, making it a superior alternative to aluminum conductors in compact conduit installations.

Applications:

This 250 MCM copper wire is an ideal choice for high-load circuits, feeder applications, and underground power distribution. Applications include:

• Service entrance cable for large commercial buildings, industrial plants, and high-power residential systems.
• Feeder circuits for heavy-duty electrical loads in industrial facilities.
• Power distribution for high-capacity electrical panels and switchgear.
• Underground feeder cable for large secondary structures and substations.
• Raceway and conduit installations where increased ampacity is required.
• Aerial applications for outdoor power distribution with UV and weather resistance.
• Photovoltaic (solar panel) systems requiring high power capacity.

Construction:

Conductor:

RHH/RHW-2/USE-2 conductors are made of annealed soft copper. Compared to aluminum, this conductor performs better in smaller conduits.

Insulation:

The cable has an abrasion, heat, and moisture resistant cross-linked polyethylene insulation (XLPE). The insulation is durable in harsh conditions. 

Standards:

• ASTM B-3 Soft Annealed Copper
• ASTM B-8 Concentric Lay Stranded Conductors
• ASTM B787 Unilay-Stranded Copper Conductors
• UL Standard 44 Type RHH and RHW
• UL Standard 854 Type USE-Service Entrance
• Federal Specifications J-C-30B, ICEA S-66-524 , NEMA WC-7, A-A-59544
• FAA Spec. L824 Type C Sizes 12-4 AWG as Airport lighting Cable
• VW-1 available where flame retardancy required. 1/0 and larger rated for CT use.
• VW-1 available on special request
• RoHS Compliant

Specifications:

Size AWG: 250

Weight per 1000 ft: 861 lbs

Outside Diameter: 0.732 inches

Number of Strands: 37

Insulation: XLPE

*Data provided on this page is subject to change based on different manufacturers' variances