CU THHW

600V Copper Thermoplastic Building Wire

PRODUCT DESCRIPTION

CU THHW is a 600V copper building wire designed for general-purpose electrical wiring in commercial, industrial, institutional, and residential installations. It features an annealed copper conductor with thermoplastic insulation engineered for high-temperature performance.

The THHW designation provides a 90°C maximum conductor temperature rating in dry locations and 75°C in wet locations, making the cable suitable for a broad range of building and industrial wiring applications where enhanced thermal performance and moisture resistance are required.

CU THHW is available in solid and stranded constructions depending on conductor size and installation requirements. The smooth insulated surface facilitates pulling through conduit and raceway systems while providing reliable electrical insulation and mechanical protection.

APPLICATIONS

CU THHW is commonly used for:

• Building power distribution

• Commercial and residential wiring

• Industrial electrical installations

• Branch circuits and feeder circuits

• Lighting and power circuits

• Panelboards and distribution boards

• Switchboards and electrical equipment

• Motor and control circuits

• Conduit and raceway systems

• Cable trays where permitted

• Dry and wet locations within the applicable temperature rating

• General-purpose machine and equipment wiring

• Industrial facilities and electrical infrastructure

STANDARDS & COMPLIANCE

Typical reference standards include:

• UL 83 — Thermoplastic-Insulated Wires and Cables

• ASTM B3 — Soft or Annealed Copper Wire

• ASTM B8 — Concentric-Lay-Stranded Copper Conductors

• NFPA 70 / NEC — National Electrical Code, where applicable

Final certification, markings, conductor construction, and allowable installation methods depend on the specific product construction and target market.

CONSTRUCTION

Conductor

• Material: Soft-drawn / annealed copper

• Conductivity: High-conductivity copper

• Construction: Solid or stranded

• Conductor configuration selected according to conductor size and application

Insulation

• Material: Thermoplastic insulation

• Color: Black, white, red, blue, green, yellow, or other colors upon request

• High-temperature electrical insulation

• Moisture-resistant performance suitable for wet locations within the applicable rating

Marking

Typical surface markings may include:

• Manufacturer identification

• Product designation

• Conductor size

• Voltage rating

• Temperature rating

• Applicable certification marks

• Sequential footage or length marking where required

TECHNICAL DATA

TYPICAL AVAILABLE CONDUCTOR SIZES

Other conductor sizes, colors, insulation thicknesses, and packaging configurations are available according to project requirements.

ELECTRICAL CHARACTERISTICS

The conductor resistance is controlled according to the applicable conductor size and manufacturing standard.

THERMAL PERFORMANCE

CU THHW is designed for elevated-temperature electrical installations.

• 90°C maximum conductor temperature in dry locations

• 75°C maximum conductor temperature in wet locations

• Suitable for continuous operation within the applicable ampacity and installation requirements

• Supports higher-temperature applications than standard 75°C dry-rated thermoplastic building wire

• Ampacity must be determined according to the applicable electrical code, installation method, ambient temperature, conductor grouping, and termination temperature limitations

Where equipment terminals or connected devices have lower temperature ratings, the lower applicable limitation shall govern.

MECHANICAL PERFORMANCE

CU THHW provides:

• Good flexibility for conduit installation

• High mechanical integrity

• Smooth insulation surface for easier pulling

• Resistance to normal installation abrasion

• Reliable dimensional stability under normal operating conditions

• Compatibility with standard electrical installation tools and accessories

Stranded constructions are particularly suitable for larger conductor sizes and installations requiring improved handling flexibility.

ENVIRONMENTAL PERFORMANCE

Depending on the specific certification and construction, CU THHW can be used in:

• Dry locations

• Wet locations within the 75°C wet rating

• Indoor electrical systems

• Outdoor installations where permitted

• Conduit and raceway systems

• Electrical equipment and distribution systems

The actual permitted installation method shall follow the applicable product marking and electrical code requirements.

INSTALLATION

CU THHW may be installed in conduit, raceways, electrical enclosures, panelboards, switchboards, and other approved wiring systems.

Installation should comply with:

• Applicable national and local electrical codes

• NEC requirements where applicable

• Conductor ampacity requirements

• Raceway fill requirements

• Minimum bending radius

• Pulling tension limitations

• Approved termination methods

• Equipment terminal temperature ratings

For copper conductors, use connectors, lugs, terminals, and other accessories approved for copper conductors and suitable for the conductor size.

KEY FEATURES

• 600V voltage rating

• 90°C dry / 75°C wet temperature rating

• High-conductivity annealed copper conductor

• Thermoplastic insulation

• Solid and stranded conductor options

• Suitable for commercial and industrial electrical systems

• Suitable for wet and dry locations within applicable ratings

• Easy installation through conduit and raceway systems

• Available in a wide range of conductor sizes

• Custom colors and packaging available

PRODUCT ADVANTAGES

High Electrical Conductivity

Annealed copper provides excellent electrical conductivity and stable electrical performance, helping reduce conductor losses in power distribution systems.

Enhanced Temperature Rating

The 90°C dry rating provides additional thermal capability compared with conventional 75°C building wire, while the 75°C wet rating allows use in approved wet-location applications.

Easy Installation

The smooth thermoplastic insulation provides good handling characteristics and facilitates pulling through conduit and raceway systems.

Broad Application Range

CU THHW can be used across commercial buildings, industrial facilities, electrical equipment, control systems, and general-purpose power distribution applications.

Flexible Product Configuration

A wide range of conductor sizes, colors, constructions, and packaging options can be supplied for different project requirements.

QUALITY CONTROL

Typical manufacturing quality controls include:

• Conductor diameter inspection

• Conductor resistance testing

• Insulation thickness measurement

• Insulation tensile and elongation testing

• High-voltage withstand testing

• Spark testing

• Dimensional inspection

• Surface marking verification

• Finished cable appearance inspection

• Finished-product electrical testing

Testing procedures can be adapted to applicable UL, ASTM, NEC, customer, and project requirements.

PACKAGING

Typical packaging options include:

• Coil

• Reel

• Wooden drum

• Plywood drum

• Export-grade packaging

• Customer-specified packaging

Packaging configuration can be customized according to conductor size, shipping method, container loading requirements, and project length.

CUSTOMIZATION

Available customization options may include:

• Conductor size

• Conductor construction

• Insulation color

• Surface marking

• Packaging length

• Reel or drum configuration

• Sequential footage marking

• Customer-specific labeling

• Private-label production

• Project-specific technical requirements

TECHNICAL SUPPORT

Technical documentation can be supplied according to project requirements, including:

• Product datasheets

• Technical specifications

• Construction drawings

• Conductor resistance data

• Ampacity reference data

• Material information

• Test reports

• Certificates and compliance documentation where applicable

• Custom technical schedules for tenders and project submissions

FAQ

1. What is CU THHW?

CU THHW is a 600V copper building wire with thermoplastic insulation, rated for 90°C in dry locations and 75°C in wet locations.

2. What is the voltage rating of CU THHW?

The standard product is rated at 600 volts.

3. What is the temperature rating?

CU THHW is typically rated:

• 90°C maximum in dry locations

• 75°C maximum in wet locations

4. Can CU THHW be used in wet locations?

Yes. THHW construction is designed for wet-location applications at the applicable 75°C wet rating, provided the installation method and product marking permit such use.

5. Is CU THHW suitable for conduit installation?

Yes. It is commonly installed in conduit, raceway, electrical enclosures, panelboards, and other approved wiring systems.

6. Is the conductor copper or aluminum?

CU THHW uses annealed copper conductors. Aluminum versions are available separately where the applicable construction and certification requirements are met.

7. What is the difference between THHW and THHN?

THHW is primarily identified by its 90°C dry / 75°C wet thermoplastic construction. THHN is typically a 90°C dry-rated thermoplastic-insulated wire with a nylon coating and may also carry a THWN-2 marking when certified for 90°C wet locations. The exact difference depends on the product construction and markings.

8. Can CU THHW be manufactured in different colors?

Yes. Standard and custom insulation colors can be supplied according to application, phase identification, project specifications, or customer requirements.

9. Is CU THHW available in large conductor sizes?

Yes. CU THHW can be manufactured in a broad range of AWG and kcmil sizes, including large stranded conductors for feeder and distribution applications.

10. Can CU THHW be customized for export projects?

Yes. Conductor size, color, marking, packaging, reel length, documentation, and other project-specific requirements can be customized subject to technical feasibility and applicable standards.

SEO INFORMATION

SEO Product Title:
CU THHW 600V Copper Building Wire | 90°C Dry / 75°C Wet

Short Description:
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Meta Description:
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CU THHW 600V Copper Thermoplastic Building Wire

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CU THHW 600V copper building wire with thermoplastic insulation for commercial and industrial electrical installations