250 MCM XHHW-2 Stranded Copper Building Wire

Name: 250 MCM XHHW-2 Stranded Copper Building Wire
Brand: Nassau National Cable - CU
SKU: NNC2471X
Price: 9.94 USD
Availability: InStock
Rating: 4.88 (9018 reviews)

Roll over image to Zoom

250 MCM XHHW-2 Stranded Copper Building Wire

250 MCM XHHW-2 Stranded Copper Building Wire

Write a Review

Ask a Question Download PDF Buyer Guide

SKU: NNC2471X

Select a Gauge

250 MCM XHHW-2 Stranded Copper Building Wire

Availability: In stock

Price:

Regular price: $9.94 /FT
Sale price: $9.94 /FT

Shipping Cost Calculated at Checkout. Standard Lead Time is 1 to 6 Business Days.

Free Shipping: On orders above $1000

Color

Length (FT):

Enter the required footage in the quantity box - Cut to one length

Where are we? 4 Continents 9 Countries

Got any Questions?

Speak with a real person who will go out of their way to help you!

Call Us: 1-516-482-6313Text Us: 1-516-703-3460

Chat

Live Chat: Bottom Right Corner!

Email Us

info@nassaunationalcable.com

Quick Support

Product Information

Specification

250 MCM XHHW-2 Stranded Copper Building Wire

Allowable Ampacity (Per NEC Table 310.16):

60°C: 215 Amps
75°C: 255 Amps
90°C (XHHW-2 Rating): 290 Amps

Description:

250 MCM XHHW-2 Copper Building Wire is a stranded conductor with cross-linked polyethylene (XLPE) insulation, designed for use in conduit, raceways, and feeders where high ampacity and durability are required. Rated for 600V or 1000V, it operates in wet, dry, and corrosive environments, with a maximum temperature rating of 90°C. The SIMpull technology allows for easier installation without the need for additional pulling lubricant.

Also Known As:

250 MCM Wire, 250 KCMIL Wire, 250 XHHW Cable 37 Strand, 250 KCMIL CU Cable, 250 MCM Copper Cable, 250 KCMIL CU Cable, 250 XHHW-2 Copper Building Wire, 250 XHHW Cable, 250 XHHW Service Wire, 250 XHHW-2 Copper Wire, 250 CU Building Wire, 250 Black Stranded CU SIMpull XHHW-2 Wire, Southwire 11304399, 250 MCM XHHW Building Wire, XHHW Stranded Building Wire.

Applications:

Main service conductors for high-load electrical panels
Primary and secondary feeders in commercial and industrial buildings
Underground conduit installations where moisture resistance is required
Backup generator wiring for hospitals, data centers, and critical facilities
Cable tray wiring in industrial settings requiring high ampacity
250A feeders at full rating
300A home services under NEC 310.12
500A services run as two parallel sets
Backup generator feeders for commercial buildings

Construction:

Conductor:

Material: Class B compressed stranded bare copper per ASTM B3 and ASTM B8

Insulation:

Material: Cross-linked polyethylene (XLPE) with SIMpull Technology
Properties: Flame-retardant, resistant to chemicals, moisture, and abrasion

Features:

SIS - 8 AWG and larger
Sunlight resistant
-40°C cold bend resistance
FT1 flame test rating
Gasoline and oil resistant II
CT Rated - 1/0 AWG and larger
FT4 flame test - 350 kcmil and larger
RoHS/REACH compliant

Standards & Compliance:

UL Standard 83 – Thermoset-Insulated Wires and Cables
ASTM B3 & B8 – Soft and Concentric-Lay-Stranded Copper Conductors
ASTM B787 – 19 Wire Combination Unilay-Stranded Copper Conductors
Federal Specification A-A-59544
RoHS/REACH Compliant
NEC Article 310.16 – Ampacity Ratings
ICEA S-95-658 (NEMA WC70) – Power Cables Rated 2000V or Less
IEEE 1202/FT4 Flame Test – (70,000 BTU/hr) 350kcmil and Larger
Buy American & Buy America Act (BAA) Compliant (49 U.S.C. § 5323(j) and 49 C.F.R. part 661)

Specifications:

Size: 250 MCM
Number of Strands: 37
Diameter Over Conductor (Inches): 0.558
Insulation Thickness (mils): 65
Approx. OD (Inches): 0.700
Copper Weight (lbs/mft): 771 lbs
Net Weight (lbs/mft): 838 lbs
Min Bending Radius: 2.8 inches
Max Pull Tension: 2000 lbs
Southwire Part (SIMpull): 11304399

Compatible with Manufacturer
Advanced Digital :	20250CT
Omni Cable :	Black : M7250ST-01 White : M7250ST-02 Red : M7250ST-03 Green : M7250ST-04 Blue : M7250ST-05 Gray : M7250ST-06 Orange : M7250ST-07 Yellow : M7250ST-08 Purple : M7250ST-09 Brown : M7250ST-10 Pink : M7250ST-11 Tan : M7250ST-12
Southwire :	Black : 11304399 White : 55389299 Red : 55389399 Blue : 55389499 Green : 55389599 Yellow : 55389899 Orange : 55389799 Brown : 55389699 Gray : 55389999
HWC :	HW00225001
Service Wire Co :	XH250BK

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

** Images are for display purposes only refer to Product Technical Details for accurate information on the product.

In the case the material only comes in a predetermined color or doesn’t come with any color

Download PDF Spec Sheet

FAQ's

What is 250 MCM copper XHHW-2 used for?

XHHW-2 is single-conductor building wire with cross-linked polyethylene (XLPE) insulation, which is where the "X" in its name comes from. "HHW" stands for high heat and water resistance, and "-2" means it's rated 90°C in wet locations as well as dry. 250 MCM copper XHHW-2 is installed in conduit or other NEC-recognized raceways at up to 600V and is rated 255A at 75°C. It's used for 250A feeders, 300A home services, 500A services in two parallel sets, and commercial generator feeders.

What are the main differences between XHHW and XHHW-2 wires?

Both use cross-linked polyethylene (XLPE) insulation and are rated 600V. The difference is the wet rating. XHHW is rated 90°C in dry locations but only 75°C in wet locations. XHHW-2 is rated 90°C in both, and it passes stricter UL 44 moisture testing. XHHW-2 can be used anywhere XHHW is allowed.

What is the difference between THHN and XHHW-2 wire?

Both THHN/THWN-2 and XHHW-2 are 600V building wires rated 90°C in wet and dry locations, so the real difference is the insulation. THHN/THWN-2 has thin PVC insulation with a nylon jacket. XHHW-2 has a single, thicker layer of cross-linked polyethylene (XLPE), a thermoset material that doesn't melt. XHHW-2 holds up better to abrasion, moisture, and cold. THHN/THWN-2 has a smaller diameter, so more conductors fit in the same conduit, and it usually costs less.

Can XHHW-2 wire be buried underground?

Not directly. XHHW-2 is not rated for direct burial, so it can't go in a trench without conduit. It can be installed underground inside conduit, because underground raceways are wet locations and XHHW-2 is rated 90°C wet. For burial without conduit, use a direct burial cable such as USE-2 or URD.

Does XHHW-2 wire have to be run in conduit?

Yes, in standard building installations. XHHW-2 is a single-conductor building wire meant for conduit or other recognized raceways. It can't be run exposed outdoors or fished through walls like NM cable, so inside a wall it has to be in conduit, such as EMT or flexible metal conduit. The NEC allows a few exceptions, such as cable tray for 1/0 AWG and larger conductors with a CT marking, or open wiring on insulators, but these are uncommon.

Is XHHW-2 wire sunlight resistant?

Yes. NNC's XHHW-2 is marked sunlight resistant, so it holds up in conduit runs exposed to the sun and where the wire leaves the conduit, such as at a weatherhead. Sunlight resistance doesn't replace the conduit requirement.

Can XHHW-2 wire be used in cold weather?

Yes. XLPE insulation stays flexible in the cold much better than PVC-insulated THHN, which makes XHHW-2 easier to pull in winter. It's commonly rated for installation down to -40°C (-40°F). Check the spec sheet for the exact minimum.

Is 250 MCM copper XHHW-2 used in data centers?

Yes. 250 MCM copper XHHW-2 feeds 200A continuous loads, which NEC 215.2 sizes at 250A, and runs in two parallel sets for 400A busway and distribution panels. It's also used for CRAH and other cooling equipment feeders.

Reviews