XHHW XHHW-2 copper driver, 600/1000 V

Low voltage cables
Moisture-resistant industrial cable

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Product description

The XHHW/XHHW‑2 copper conductor cable is a low voltage electrical cable with cross-linked polyethylene insulation (XLPE), offering excellent heat resistance, to humidity and mechanical stress. It is designed for fixed installations in residential buildings, industrial and commercial.

The XHHW cable is suitable for installations in dry environments up to 90°C, but limited to 75°C in a humid environment.
The XHHW‑2 copper cable, improved version, allows continuous operation at 90°C in both dry and humid environments, meeting the needs of the most demanding environments.

Complies with UL and NEC standards, these cables can be laid in conduits, cable ducts or trays.
ZMS Cable offers high conductivity copper XHHW‑2 cables, available in several sections and lengths, with custom manufacturing options for your specific projects.

Construction

Setting	Description
Conductor material	Flexible annealed bare copper, conforms to ASTM B-3 standards / B-8 / B-787
Wiring class	Fine stranded conductor : 7/19/37/61 strands according to section. From 1/0 AWG, suitable for cable tray
Insulation material	Cross-linked polyethylene (XLPE) – heat resistant, to humidity and flames.
Band	Binding strip
Tear cord	Nylon tear wire
Outer sheath	Special PVC

Applications of XHHW‑2 cable

XHHW‑2 is widely used in various electrical engineering environments, notably :

Electrical distribution of buildings, industries and businesses : main distribution lines, branches and wiring of electrical conduits.
Wet/dry environments : underground installations, pump rooms, etc., continuous operation at 90 °C.
Industrial environment : chemical plants, wastewater treatment plants, gas/oil sites and other sites with corrosive environments.
Medical facilities : hospital equipment and imaging lines, low leak rate, compliant with hospital cable quality standards.
Solar energy and high voltage systems : app support 1 kV, suitable for high demand applications such as photovoltaics and frequency conversion control of variable frequency drives.

Standard

UL 44, UL 1685, ASTM B‑3/B‑8/B‑787, NO WC‑70/ICEA S‑95‑658, NFPA70（NEC）, Federal A‑A‑59544，RoHS

Settings

Setting	Description (technical French)
Tension nominale	600 V (all sections) ; 1 000 V for sections ≥ 8AWG with double certification
Service temperature	Maximum temperature in service : 90 °C in dry or humid environment (certain products up to 105°C)
Compliance with standards	Compliant with standards : UL 44, UL 1685, ASTM B-3/B-8/B-787, NO WC-70/ICEA S-95-658, NFPA 70 (NEC), Federal A‑A‑59544, RoHS, etc.
UV resistance	Meets anti-UV requirements for all colors from section 8AWG
Cable-tray classification	From 1/0 AWG, conforms to UL1685 ladder flame test (70 000 Btu/h)

Technical data

Size (AWG or kcmil)	Number of strands	Insulation thickness (mil)	Approximate outer diameter (thumb)	Approximate net weight (lb/ltd)
14	7 or 19	30	0.13	18
12	7 or 19	30	0.15	27
10	7 or 19	30	0.18	40
8	7 or 19	45	0.24	67
6	7 or 19	45	0.27	101
4	7 or 19	45	0.32	153
3	7 or 19	45	0.35	192
2	7 or 19	45	0.38	236
1	19	55	0.44	298
1/0	19	55	0.48	369
2/0	19	55	0.53	459
3/0	19	55	0.58	572
4/0	19	55	0.63	713
250	37	65	0.70	849
300	37	65	0.75	1010
350	37	65	0.80	1171
400	37	65	0.85	1331
500	37	65	0.93	1651
600	61	80	1.04	1997
750	61	80	1.14	2477
1000	61	80	1.29	3272

The above data is approximate and subject to usual manufacturing tolerances. If necessary, compatibility with cable glands, connectors and accessories must be verified to the actual dimensions of the product. Other dimensions available on request.
Noticed : The sizes of 14 AWG to 2 AWG can be class B (7 strands) or class C (19 strands).
* 600 V only

Advantages of XHHW cables / XHHW‑2 manufactured by ZMS Cable

1. International multi-standard compliance
Our cables are certified according to UL standards, ASTM, IEC, GB, NEMA and have UL labels, CE, RoHS, ISO 9001, guaranteeing quality that meets the requirements of global markets.

2. Strong customization capability
ZMS offers tailor-made solutions : multi-conductor cables, with screen, isolated in specific colors, or with additional sheaths, to meet all cabling needs.

3. Global presence & fast logistics
Our products are exported to more than 90 pays, with an annual turnover exceeding 300 millions USD. Thanks to an optimized supply chain, delivery times are short and reliable.

4. Thick and durable XLPE insulation
ZMS XHHW‑2 cable uses high quality thermosetting XLPE, ensuring excellent water resistance, with oils and UV, even in harsh industrial environments.

5. ASTM Grade Annealed Copper Conductor
Manufactured with bare copper annealed to ASTM B‑3 / B‑8, our cable offers low electrical resistance and excellent conductivity. Available in single-strand or multi-strand versions, it adapts to all levels of flexibility required.

Comparison of insulated cables – THHN, RHW-2, USE-2, XHHW and XHHW-2

Setting	THHN	Rw‑2	USE‑2	XHHW	XHHW-2
Conductor material	Copper (Class B)	Copper or aluminum	Copper or aluminum	Copper or aluminum	Copper or aluminum
Isolation	PVC + thermoplastic nylon	XLPE (cross-linked polyethylene)	XLPE (cross-linked polyethylene)	XLPE	XLPE
Tension nominale	600 V	600/2000 V (600 V courant)	600/1000 V (600 V courant)	600 V	600/1000 V
Temperature in dry environment	90 ℃	90℃	90 ℃	90 ℃	90 ℃
Temperature in humid environment	75 ℃	90 ℃	90 ℃	75 ℃	90 ℃
UV resistance	Non (unless specifically mentioned)	Oui	Oui (designed for outdoor use)	Oui (≥ 8 AWG)	Oui (≥ 8 AWG)
Direct buried installation	Non	Oui	Oui (specifically designed for this)	Non	Oui (often with EMT conduits)
Use in conduit	Oui (often in conduit EMT)	Yes or no depending on the case	Oui	Oui	Oui
Use in humid environments	Limit	Oui	Oui	Limit	Oui
Construction features	Gaine PVC + lightweight nylon	Thick XLPE insulation, high durability	Thick XLPE, ideal for buried installation	Medium thickness XLPE	Thick XLPE, superior performance
Fire resistance	Oui (according to UL 83)	High (UL compliant 44)	Average	Average	High (UL compliant 44)
Applications	Interior wiring, Electric cabinets	Industry, power plants, wet or underground areas	External networks, buried distribution boxes	Buildings, dry environments	Dry or humid environments, industrial/commercial use

Which cable to choose ? summary

THHN cable : Lightweight and economical, this copper cable for dry indoor use is widely used in electrical cabinets. Attention : not very resistant to humidity, it is not suitable for outdoor installations.
RHW‑2 cable : Thanks to its thick XLPE insulation, This is a heat resistant cable, humidity and underground conditions. Ideal for industrial environments and buried conduits.
USE‑2 cable : This outdoor electrical cable is designed for direct ground laying and residential main power lines. Its robust construction makes it a safe choice for outdoor low-voltage networks.
XHHW cable : Suitable for general building wiring. However, its performance remains limited in humid or prolonged outdoor environments.
XHHW‑2 copper cable : The ultimate versatile choice. This copper electrical cable, certified for use at 600/1000V, resists humidity, to heat and UV. Recommended for modern projects requiring flexibility, durability and compliance with UL/CSA/NEMA standards.

If your installation concerns a humid area (like underground conduits, pumping stations or exterior passages exposed to water), it is strongly recommended to opt for the XHHW‑2 copper cable. This model offers better thermal stability, excellent moisture resistance and increased safety margins for demanding environments.

For strictly dry areas, the old XHHW cable can theoretically be sufficient for use up to 90°C. However, taking into account long-term maintenance cost and modern safety standards, the XHHW‑2 remains the most reliable and durable solution.