THHN/THWN wire is a common type of electrical building wire used for power distribution in residential, commercial, and industrial installations.

Meaning of THHN / THWN
• T – Thermoplastic insulation
• HH – High heat resistance (up to 90°C)
• W – Suitable for wet locations
• N – Nylon-coated for added protection

General Description
• Type: Single-conductor electrical wire (solid or stranded)
• Conductor: Bare or tinned copper (solid in your case)
• Insulation: PVC (thermoplastic)
• Outer Jacket: Nylon coating
• Voltage Rating: 600 volts
• Temperature Rating:
o 90°C (dry locations)
o 75°C (wet locations)

Construction (Solid Wire)
• Made of a single solid copper conductor (not stranded)
• Typically, available in sizes like 1.6 mm to 2.6 mm (AWG 14–10)
• Covered with PVC insulation + nylon sheath for durability

Key Features
• Heat-resistant (up to 90°C dry)
• Moisture-resistant (THWN rating for wet areas)
• Oil and chemical resistant
• Flame-retardant insulation
• Smooth nylon jacket (easy pulling through conduit)

Typical Uses
• Installed in conduits, raceways, or cable trays
• Used for:
o Branch circuits
o Feeders
o Service wiring
• Applicable in:
o Residential buildings
o Commercial establishments
o Industrial systems

Summary:

THHN/THWN 600V 90°C solid wire is a copper electrical wire with PVC insulation and nylon jacket, designed for high heat, moisture resistance, and safe operation up to 600 volts, commonly used inside conduits for building wiring.