CU THWN-2

600V Copper Thermoplastic Heat- and Water-Resistant Building Wire

PRODUCT DESCRIPTION

CU THWN-2 is a 600V copper building wire designed for general-purpose electrical wiring in residential, commercial, institutional, and industrial installations. It features an annealed copper conductor with thermoplastic insulation engineered for high-temperature and moisture-resistant performance.

The THWN-2 designation provides a 90°C maximum conductor temperature rating in both wet and dry locations, making CU THWN-2 suitable for electrical systems where elevated operating temperatures and moisture exposure may occur.

CU THWN-2 is available in solid and stranded constructions depending on conductor size and installation requirements. Its smooth insulated surface provides good handling characteristics and facilitates installation through conduit, raceway, and other approved wiring systems.

APPLICATIONS

CU THWN-2 is commonly used for:

• Building power distribution

• Commercial electrical wiring

• Residential branch circuits

• Industrial electrical installations

• Feeder circuits

• Branch circuits

• Lighting circuits

• Panelboards and distribution boards

• Switchboards

• Motor circuits

• Control circuits

• Electrical equipment wiring

• Conduit and raceway systems

• Cable trays where permitted

• Wet and dry locations

• Outdoor electrical systems where permitted

• General-purpose electrical installations

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 permitted 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

• Heat-resistant construction

• Moisture-resistant construction

• Designed for 90°C operation in wet and dry locations

• Nominal insulation thickness according to applicable standards

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 constructions, and packaging configurations are available according to project requirements.

ELECTRICAL CHARACTERISTICS

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

THERMAL PERFORMANCE

CU THWN-2 is designed for electrical systems requiring enhanced thermal performance in both wet and dry locations.

• 90°C maximum conductor temperature in dry locations

• 90°C maximum conductor temperature in wet locations

• Suitable for continuous operation within applicable ampacity limitations

• Provides higher temperature capability than standard THWN construction

• Supports applications where moisture exposure and elevated conductor temperatures may occur

• Ampacity must be determined according to conductor size, installation method, ambient temperature, conductor grouping, and applicable electrical code requirements

Where connected equipment or terminals have a lower temperature rating, the lower applicable limitation shall govern.

MOISTURE RESISTANCE

CU THWN-2 is designed for applications where moisture exposure may occur while maintaining its 90°C wet-location temperature rating.

Typical applications include:

• Wet-location conduit systems

• Outdoor raceways where permitted

• Underground raceways where permitted

• Damp electrical equipment areas

• Industrial facilities

• Commercial buildings

• Utility and infrastructure wiring systems

• Electrical distribution systems

The actual installation method must comply with the product marking and applicable electrical code requirements.

MECHANICAL PERFORMANCE

CU THWN-2 provides:

• Good flexibility for conduit installation

• Reliable mechanical integrity

• Smooth insulation surface

• Resistance to normal installation abrasion

• Stable dimensions under normal operating conditions

• Good handling characteristics during pulling and termination

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

ENVIRONMENTAL PERFORMANCE

Depending on the specific certification and construction, CU THWN-2 can be used in:

• Wet locations

• Dry locations

• Damp environments

• Indoor electrical systems

• Outdoor installations where permitted

• Conduit and raceway systems

• Electrical enclosures

• Distribution equipment

• Industrial electrical infrastructure

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

INSTALLATION

CU THWN-2 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 accessories approved for copper conductors and suitable for the conductor size.

KEY FEATURES

• 600V voltage rating

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

• Annealed copper conductor

• Heat- and water-resistant thermoplastic insulation

• Solid and stranded conductor options

• Suitable for wet and dry locations within applicable ratings

• High electrical conductivity

• Good installation flexibility

• Wide range of AWG and kcmil sizes

• Suitable for commercial and industrial applications

• Suitable for outdoor and moisture-exposed systems where permitted

• Custom colors and packaging available

PRODUCT ADVANTAGES

Enhanced Thermal Capability

The 90°C rating in both wet and dry locations provides higher thermal capability than conventional THWN and THW constructions.

Excellent Moisture Resistance

THWN-2 is specifically designed for wet-location applications while maintaining its 90°C conductor temperature rating.

High Electrical Conductivity

Annealed copper conductors provide excellent electrical conductivity and reliable current-carrying performance.

Reliable Thermoplastic Insulation

Thermoplastic insulation provides dependable electrical isolation and mechanical protection during installation and normal operation.

Broad Application Range

CU THWN-2 is suitable for feeders, branch circuits, lighting, equipment wiring, control systems, panelboards, switchboards, and industrial power distribution.

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-product 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 THWN-2?

CU THWN-2 is a 600V copper building wire with thermoplastic insulation designed for heat and moisture resistance, typically rated 90°C in both wet and dry locations.

2. What is the voltage rating of CU THWN-2?

The standard product is rated at 600 volts.

3. What is the temperature rating?

CU THWN-2 is typically rated:

• 90°C in dry locations

• 90°C in wet locations

4. Can CU THWN-2 be used in wet locations?

Yes. THWN-2 is specifically designed for wet-location applications at its applicable 90°C wet rating, subject to product marking and installation requirements.

5. What is the difference between THWN and THWN-2?

THWN is typically rated 75°C wet/dry, while THWN-2 is typically rated 90°C wet/dry.

6. What is the difference between THW-2 and THWN-2?

Both are commonly rated 90°C wet/dry. THWN-2 specifically identifies the construction as heat- and water-resistant, while THW-2 identifies the 90°C wet/dry thermoplastic construction without the additional N designation.

7. What is the difference between THHN and THWN-2?

THHN is generally a 90°C dry-rated thermoplastic wire and commonly uses a nylon coating. THWN-2 is specifically rated 90°C in both wet and dry locations. A product may carry both THHN and THWN-2 markings when it meets the corresponding construction and certification requirements.

8. Is CU THWN-2 suitable for conduit installation?

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

9. Is CU THWN-2 available in stranded construction?

Yes. Stranded construction is commonly supplied for medium and large conductor sizes to improve handling and installation flexibility.

10. Can CU THWN-2 be customized?

Yes. Conductor size, construction, insulation color, surface marking, packaging, reel length, labeling, and project-specific documentation can be customized subject to applicable standards.

SEO INFORMATION

SEO Product Title:
CU THWN-2 600V Copper Building Wire | 90°C Wet/Dry

Short Description:
CU THWN-2 is a 600V copper building wire featuring annealed copper conductors and heat- and water-resistant thermoplastic insulation with a 90°C wet/dry temperature rating.

Meta Description:
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Suggested URL Slug:
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Product Image Title:
CU THWN-2 600V Copper Heat- and Water-Resistant Building Wire

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CU THWN-2 600V copper building wire with thermoplastic insulation for wet and dry electrical installations