Description

Technical Parameters

Certification

easy pulling THHN copper wire

PRODUCT REAL SHOT

400 Kcmil THHN/THWN-2 Copper Conductor UL 83 Certified Heavy-Duty Copper Wire

400 kcmil THHN/THWN-2 Copper Conductor UL 83 Certified Heavy-Duty Copper Wire

This 400 kcmil UL 83 Copper THHN/THWN-2 Wire is a heavy-gauge, UL certified THHN THWN-2 copper wire manufactured in strict compliance with UL 83 safety standards, engineered for high-amperage power distribution in large commercial, industrial and infrastructure projects. It features a high-purity annealed copper conductor paired with a dual-layer thermoplastic system - flame-retardant PVC insulation protected by a rugged nylon outer jacket - delivering dual 90°C ratings for both dry (THHN) and wet (THWN-2) locations. As a large-format UL-certified building wire, it is the industry-standard specification for main service entrances, high-capacity feeder circuits and heavy equipment supply lines that demand uncompromising safety and code compliance.

PRODUCT SPECIFICATIONS

nylon coated Copper THHN/THWN-2 Wire

Conductor Size	Conductor Stranding	Insulation Thickness	Jacket Thickness	Nominal O.D.	Approx Net Weight	Allowable Ampacities(1) @30℃ Ambient
AWG/Kcmil	Number of Strands	mils	mils	Inch	lbs/1000ft.	75℃	90℃
14	1	15	4	0.101	17	20	25
12	1	15	4	0.119	25	25	30
10	1	20	4	0.150	39	35	40
14	19	15	4	0.113	16	20	25
12	19	15	4	0.133	25	25	30
10	19	20	4	0.164	39	35	40
8	19	30	5	0.218	63	50	55
6	19	30	5	0.252	96	65	75
4	19	40	6	0.325	153	85	95
3	19	40	6	0.353	193	100	115
2	19	40	6	0.381	236	115	130
1	19	50	7	0.437	300	130	145
1/0	19	50	7	0.480	373	150	170
2/0	19	50	7	0.522	464	170	195
3/0	19	50	7	0.572	577	200	225
4/0	19	50	7	0.629	719	230	260
250	37	60	8	0.703	857	255	290
300	37	60	8	0.758	1019	285	320
350	37	60	8	0.808	1181	310	350
400	37	60	8	0.851	1342	335	380
500	37	60	8	0.937	1665	380	430
600	61	70	9	1.036	2002	420	475
750	61	70	9	1.134	2465	475	535
1000	61	70	9	1.273	3296	545	615

CERTIFICATIONS

PVC insulated THHN copper wire

PACKAGING

Plastic Reel

Small Wooden Reel

Large Wooden Reel

APPLICATION

Cable Tray Raceway Systems

Underground Conduit Installation

Branch Circuit Wiring

CASE

Mayo Clinic Hospital, Saint Marys Campus

30 Hudson Yards

Stanford University California USA

WHY CHOOSE US

30Years of experience
in one-stop service

Dongguan Greater Wire & Cable Co., Ltd. is a professional engineering-grade cable manufacturer in China, supplying certified electrical cable solutions for building, industrial, mining, energy, and infrastructure projects worldwide.

With a 30,000 m² factory, 30 production lines, experienced engineers, and a strict quality control team, we provide reliable, traceable, and compliant cable products for international engineering applications. Our products are supported by certifications including SAA, UL, cUL, VDE, TÜV, CE, CB, IEC, BPS, and ISO.

We are committed to safety, quality, transparency, and long-term partnership. From raw material inspection to finished product testing, every batch is carefully controlled to ensure stable performance and dependable project use.

Greater Cable - Certified Quality. Reliable Supply. Engineering Value.

15K

Finished Projects

150+

professional staff

15K

happy clients

92+

awards & certifacates

PLANT EQUIPMENT

GLOBAL CERTIFICATIONS

THHN Copper Building Wire

CUSTOMER PHOTOS

THWN-2 Copper Building Wire

INTERNATIONL TRANSPORTATION

Sea Freight

We offer reliable sea freight solutions for large-volume orders. Your goods are securely packed and shipped in containers, ensuring cost-effective delivery to ports worldwide.

Air Freight

For faster delivery, our air freight service ensures your products reach international destinations quickly, with careful handling and full tracking along the way.

International Express

Need urgent shipments? Our international express service delivers small to medium orders efficiently, providing door-to-door service with real-time tracking for peace of mind.

COOPERATIVE PARTNER

We are looking for a cooperative partner to expand our business.

How To Cooperate With Us?

Simply share your requirements, receive our professional solution, confirm samples, and enjoy fast, reliable production and worldwide delivery - working with us is that easy.

Our address

Building 2, No. 40 Luxi 2nd Road, Liaobu Town, Dongguan City, Guangdong Province, China

Phone Number

+86 136 6257 9592

+86 135 1078 4550

E-mail

manager01@greaterwire.com

FAQ

What terminals are required for 400 kcmil THHN/THWN-2 copper conductors?

Use 90℃-rated compression lugs matched to Class B stranded copper, crimped with calibrated hydraulic tools. Follow manufacturer torque specs to prevent connection overheating; select wet-rated lugs for damp or outdoor service entrance locations.

When should I choose 400 kcmil THHN/THWN-2 instead of XHHW-2?

Pick THHN/THWN-2 for standard conduit and cable tray runs in commercial buildings, as it delivers reliable performance at a lower cost for general distribution. Choose XHHW-2 with XLPE insulation for continuously loaded feeders,high-humidity or underground scenarios that need better thermal aging and moisture resistance.

How long does 400 kcmil UL 83 THHN/THWN-2 typically last?

When operated within ratings and installed per code in standard indoor commercial environments, it has an expected service life of 20–30 years. Lifespan will shorten with sustained overheating, unprotected UV exposure, or corrosive operating conditions.

Is 400 kcmil THHN/THWN-2 approved for cable tray installation?

Yes, it is permitted in ventilated cable trays per NEC Article 392. Ventilated trays provide better heat dissipation than sealed conduits, reducing ampacity derating requirements. Protect the nylon jacket from sharp tray edges, and always comply with tray fill limits.

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