THHN Wire | McMaster-Carr

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About Wire and Cable

Use for buildings
Stranded Wire: Flexible
Solid Wire: Bend and Stay
Temperature Range:
Wire with Nylon Outer Insulation: -10° to 190° F
Wire with Polyethylene Outer Insulation: -40° to 190° F

Install this copper wire in conduit and cable trays in commercial and industrial buildings. It's also known as branch circuit wire. The outer jacket is designed to be installed without applying pulling lubricant.

Stranded wire is flexible, so it’s pliable enough to be pulled around corners. Solid wire bends and stays in the position that you bend it. It’s easier to terminate than stranded wire.

Wire with a nylon outer insulation resists oil and water. THHN wire can be used in dry or damp locations where wire is exposed to condensation or moisture, such as a basement. THWN and THWN-2 wire can be used in both wet and dry environments.

Flame rated VW-1 wire meets requirements for preventing the spread of flames based on a timed test with vertically suspended material.

For technical drawings and 3-D models, click on a part number.

Stranded Wire with Nylon Plastic Outer and PVC Plastic Inner Insulation

TFFN, THHN/THWN, and THHN/THWN-2 Stranded

Shorter Lengths

600V AC/600V DC
Wire Ga.	Strand Count	Current	OD	Industry Designation	Specifications Met	Choose an Outer Insulation Color	Length, ft.		Per Ft.
14	19/27	15 A @ 86° F	0.11"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	25, 50, 100, 250	0000000	00000
12	19/25	20 A @ 86° F	0.13"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	25, 50, 100, 250	0000000	000
10	19/23	30 A @ 86° F	0.16"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	000
8	19/21	55 A @ 86° F	0.21"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	0000
6	19/19	75 A @ 86° F	0.25"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	0000
4	19/17	95 A @ 86° F	0.32"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	0000
3	19/16	110 A @ 86° F	0.35"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	0000
2	19/15	130 A @ 86° F	0.38"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	0000
1/0	19/13	170 A @ 86° F	0.47"	THHN, THWN-2	UL Listed	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	0000
2/0	19/12	195 A @ 86° F	0.52"	THHN, THWN-2	UL Listed	Black, Blue, Brown, Green, Orange, Red, White, Yellow	10, 25, 50, 100, 250	0000000	0000

500-ft. Spools

600V AC/600V DC
Wire Ga.	Strand Count	Current	OD	Industry Designation	Specifications Met	Choose an Outer Insulation Color		Each
14	19/27	15 A @ 86° F	0.11"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
12	19/25	20 A @ 86° F	0.13"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
10	19/23	30 A @ 86° F	0.16"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
8	19/21	55 A @ 86° F	0.21"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
6	19/19	75 A @ 86° F	0.25"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
4	19/17	95 A @ 86° F	0.32"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
3	19/16	110 A @ 86° F	0.35"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	00000000
2	19/15	130 A @ 86° F	0.38"	THHN, THWN-2	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	00000000
1/0	19/13	170 A @ 86° F	0.47"	THHN, THWN-2	UL Listed	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	00000000
2/0	19/12	195 A @ 86° F	0.52"	THHN, THWN-2	UL Listed	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	00000000

Solid Wire with Nylon Plastic Outer and PVC Plastic Inner Insulation

THHN/THWN Solid Wire

Shorter Lengths

600V AC/600V DC
Wire Ga.	Current	OD	Industry Designation	Specifications Met	Choose an Outer Insulation Color	Length, ft.		Per Ft.
14	15 A @ 86° F	0.1"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	25, 50, 100, 250	0000000	00000
12	20 A @ 86° F	0.12"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	25, 50, 100, 250	0000000	000
10	30 A @ 86° F	0.15"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	25, 50, 100, 250	0000000	000

500-ft. Spools

600V AC/600V DC
Wire Ga.	Current	OD	Industry Designation	Specifications Met	Choose an Outer Insulation Color		Each
14	15 A @ 86° F	0.1"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
12	20 A @ 86° F	0.12"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000
10	30 A @ 86° F	0.15"	THHN, THWN	UL Listed, C-UL Listed, UL 2556 VW-1	Black, Blue, Brown, Green, Orange, Red, White, Yellow	0000000	000000

Aluminum Building Wire

Use for buildings
Flexible
Temperature Range: -40° to 190° F

Mend or extend aluminum wire often found in older buildings. This wire isn’t recommended for new wiring, since it’s more likely to overheat than copper when conducting electricity. However, it’s safer to maintain existing aluminum wire with aluminum rather than mixing materials. Building wire is also known as branch circuit wire.

This wire has an outer layer of nylon insulation that won't degrade from oil and water. It’s designed to be pulled through conduit without pulling lubricants. THHN and THWN-2 designated, this wire can be used in damp places.

For technical drawings and 3-D models, click on a part number.

Stranded Wire with Nylon Plastic Outer and PVC Plastic Inner Insulation
Wire Ga.	Current	OD	Outer Insulation Color	Industry Designation	Specifications Met		25 ft.	50 ft.	100 ft.	250 ft.	500 ft.
600V AC/600V DC
6	55 A @ 86° F	0.24"	Black	THHN, THWN-2	UL Listed	0000000	000000	000000	000000	0000000	0000000
4	75 A @ 86° F	0.3"	Black	THHN, THWN-2	UL Listed	0000000	00000	00000	00000	000000	000000
2	100 A @ 86° F	0.36"	Black	THHN, THWN-2	UL Listed	0000000	00000	00000	00000	000000	000000
1	115 A @ 86° F	0.41"	Black	THHN, THWN-2	UL Listed	0000000	00000	00000	00000	000000	000000
1/0	135 A @ 86° F	0.45"	Black	THHN, THWN-2	UL Listed	0000000	00000	00000	00000	000000	000000
2/0	150 A @ 86° F	0.49"	Black	THHN, THWN-2	UL Listed	0000000	00000	00000	000000	000000	000000

Armored Building Cable

THHN

Use For: Buildings
Flexible
Temperature Range:
MC, THHN: 15° to 190° F
MC, XHHW-2: -40° to 190° F
Outer Insulation:
MC, THHN: Aluminum Armor
MC, XHHW-2: Aluminum Armor, PVC Plastic
Inner Insulation:
MC, THHN: PVC Plastic
MC, XHHW-2: Cross-Linked Polyethylene (XLPE)

Also known as metal clad (MC) cable, this cable has metal armor that acts as conduit to protect the building wires. It's often used along the exterior of walls to carry power to outlet boxes. It has a ground wire that is not counted in the number of wires.

Hazardous location environmental ratings indicate whether manufacturers have included safety features in products to facilitate their safe use in a hazardous environment. Before selecting a product for a hazardous location, ensure it is rated for your environment.

Cable with THHN wire stands up to condensation and moisture in basements and other damp environments.

For technical drawings and 3-D models, click on a part number.

MC, THHN Solid Wire
Wire Ga.	No. of Wires	Cable AWG	Current	OD	Inner Insulation Color	Features	Environmental Rating	Specifications Met		10 ft.	25 ft.	50 ft.	100 ft.	250 ft.
600V AC
14	2	14/2	15 A @ 86° F	0.44"	Black, Green, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	000000	000000	000000	0000000	0000000
14	3	14/3	15 A @ 86° F	0.46"	Black, Green, Red, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	00000	000000	000000	000000
14	4	14/4	15 A @ 86° F	0.49"	Black, Blue, Green, Red, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	00000	000000	000000	000000
12	2	12/2	20 A @ 86° F	0.48"	Black, Green, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	00000	00000	000000	000000
12	3	12/3	20 A @ 86° F	0.51"	Black, Green, Red, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	00000	000000	000000	000000
12	4	12/4	20 A @ 86° F	0.54"	Black, Blue, Green, Red, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	000000	000000	000000	000000
10	2	10/2	30 A @ 86° F	0.54"	Black, Green, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	00000	000000	000000	000000
10	3	10/3	30 A @ 86° F	0.58"	Black, Green, Red, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	000000	000000	000000	000000
10	4	10/4	30 A @ 86° F	0.62"	Black, Blue, Green, Red, White	Insulated Ground Wire	NEC Class I Division 2 Groups A, B, C, D NEC Class II Division 2 Groups F, G NEC Class III Divisions 1, 2	UL 1569, UL 2556 VW-1	0000000	00000	000000	000000	000000	00000000

Building Cable

NM-B

UF-B

Use For:
NM-B, THHN: Buildings
UF-B, THHN: Buildings, Outdoors
Bend and Stay
Temperature Range: 10° to 190° F
Insulation: PVC Plastic

Rated for in-wall installation, this cable carries power to wall outlets. Also known as branch circuit wire, it can be used without conduit. It has solid THHN building wires, so the cable will stay in the shape you bend it. The uninsulated ground wire is not counted in the number of wires.

NM-B cable is for dry locations where moisture is not a concern, and often run through walls, ceilings, and concrete blocks.

UF-B cable is for wet locations where cable may be exposed to moisture or humidity. It's often used as underground feeder cable for pumps and lighting. The insulation resists moisture and UV light.

												Per Ft.
Wire Ga.	No. of Wires	Cable AWG	Current	Wd.	Thick.	Outer Insulation Color	Inner Insulation Color	Features	Specifications Met	Length, ft.		1-249	250-Up
NM-B, THHN Solid Wire
600V AC
14	2	14/2	15 A @ 86° F	0.37"	0.16"	White	Black, White	Uninsulated Ground Wire	UL Listed, UL 719	10, 25, 50, 100, 250	00000000	00000	00000
14	3	14/3	15 A @ 86° F	0.46"	0.18"	Blue	Black, Red, White	Uninsulated Ground Wire	UL Listed, UL 719	10, 25, 50, 100, 250	00000000	0000	000
12	2	12/2	20 A @ 86° F	0.42"	0.18"	Yellow	Black, White	Uninsulated Ground Wire	UL Listed, UL 719	10, 25, 50, 100, 250	00000000	0000	000
12	3	12/3	20 A @ 86° F	0.52"	0.19"	Purple	Black, Red, White	Uninsulated Ground Wire	UL Listed, UL 719	10, 25, 50, 100, 250	00000000	0000	0000
10	2	10/2	30 A @ 86° F	0.49"	0.21"	Orange	Black, White	Uninsulated Ground Wire	UL Listed, UL 719	10, 25, 50, 100, 250	00000000	0000	0000
10	3	10/3	30 A @ 86° F	0.63"	0.22"	Pink	Black, Red, White	Uninsulated Ground Wire	UL Listed, UL 719	10, 25, 50, 100, 250	00000000	0000	0000
UF-B, THHN Solid Wire
600V AC
14	2	14/2	15 A @ 86° F	0.42"	0.17"	Gray	Black, White	Uninsulated Ground Wire	UL Listed, UL 493	10, 25, 50, 100, 250	0000000	0000	000
14	3	14/3	15 A @ 86° F	0.58"	0.17"	Gray	Black, Red, White	Uninsulated Ground Wire	UL Listed, UL 493	10, 25, 50, 100, 250	0000000	0000	000
12	2	12/2	20 A @ 86° F	0.46"	0.18"	Gray	Black, White	Uninsulated Ground Wire	UL Listed, UL 493	10, 25, 50, 100, 250	0000000	0000	0000
12	3	12/3	20 A @ 86° F	0.63"	0.18"	Gray	Black, Red, White	Uninsulated Ground Wire	UL Listed, UL 493	10, 25, 50, 100, 250	0000000	0000	0000
10	2	10/2	30 A @ 86° F	0.52"	0.22"	Gray	Black, White	Uninsulated Ground Wire	UL Listed, UL 493	10, 25, 50, 100, 250	0000000	0000	0000
10	3	10/3	30 A @ 86° F	0.73"	0.22"	Gray	Black, Red, White	Uninsulated Ground Wire	UL Listed, UL 493	10, 25, 50, 100, 250	0000000	0000	0000

Armored Building Cable with Uninsulated Ground Wire

Use For: Buildings
Flexible
Temperature Range: 15° to 190° F
Insulation:
Outer: Aluminum Armor
Inner: PVC Plastic

Also known as AC cable, this cable has an uninsulated aluminum ground wire that's in constant contact with the aluminum armor, so it can be used for bonding and grounding. The uninsulated ground wire is not counted in the number of wires. The armor acts as conduit to protect the THHN building wires. It's often used along the exterior of walls to carry power to outlet boxes. All are flame rated VW-1 to meet requirements for preventing the spread of flames based on a timed test with vertically suspended material.

Solid Wire
Wire Ga.	No. of Wires	Cable AWG	Current	OD	Inner Insulation Color	Features	Industry Designation	Specifications Met		10 ft.	25 ft.	50 ft.	100 ft.	250 ft.
600V AC
14	2	14/2	15 A @ 86° F	0.46"	Black, White	Uninsulated Ground Wire	AC, THHN	UL Listed, UL 2556 VW-1	0000000	000000	000000	000000	0000000	0000000
14	3	14/3	15 A @ 86° F	0.48"	Black, Red, White	Uninsulated Ground Wire	AC, THHN	UL Listed, UL 2556 VW-1	0000000	00000	00000	000000	000000	000000
12	2	12/2	20 A @ 86° F	0.5"	Black, White	Uninsulated Ground Wire	AC, THHN	UL Listed, UL 2556 VW-1	0000000	00000	00000	00000	000000	000000
12	3	12/3	20 A @ 86° F	0.52"	Black, Red, White	Uninsulated Ground Wire	AC, THHN	UL Listed, UL 2556 VW-1	0000000	00000	00000	000000	000000	000000
10	2	10/2	30 A @ 86° F	0.56"	Black, White	Uninsulated Ground Wire	AC, THHN	UL Listed, UL 2556 VW-1	0000000	00000	00000	000000	000000	000000
10	3	10/3	30 A @ 86° F	0.59"	Black, Red, White	Uninsulated Ground Wire	AC, THHN	UL Listed, UL 2556 VW-1	0000000	00000	000000	000000	000000	000000

Armored Building Cable with Fittings

Use For: Buildings
Flexible
Temperature Range: -10° to 190° F
Insulation:
Outer: Steel Armor
Inner: PVC Plastic

Also known as fixture whips, this cable has locknuts and fittings attached to the metal armor to secure to a knockout. The armor acts as conduit to protect the THHN building wires. It has 6" long wire leads for hardwiring to an existing electrical system, and is often used to connect light fixtures.

Solid Wire
Wire Ga.	No. of Wires	Cable AWG	Current	OD	Inner Insulation Color	Includes	Industry Designation	Specifications Met	Lg., ft.		Each
600V AC
14	3	14/3	15 A @ 86° F	0.46"	Black, Green, White	1/2 NPT Fittings, Locknuts, 6" Wire Leads	THHN	UL Listed	6	0000000	000000
14	4	14/4	15 A @ 86° F	0.49"	Black, Green, Red, White	1/2 NPT Fittings, Locknuts, 6" Wire Leads	THHN	UL Listed	6	0000000	00000
12	4	12/4	20 A @ 86° F	0.92"	Black, Green, Red, White	1/2 NPT Fittings, Locknuts, 6" Wire Leads	THHN	UL Listed	6	0000000	00000
Stranded Wire
600V AC
12	3	12/3	20 A @ 86° F	0.52"	Black, Green, White	1/2 NPT Fittings, Locknuts, 6" Wire Leads	THHN	UL Listed	6	0000000	00000