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UL 3321

UL 1007 Hook-Up Wire
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UL 3321 Hook-Up Wire

Hook-Up Wire – 600V AC / 750V DC, XLPE Insulation, High Temperature Rated to 150°C

Application

UL 3321 wire is a high-performance hook-up wire commonly used in internal wiring of electrical panels, switchgear, transformers, appliances, and industrial control equipment. With a temperature rating up to 150°C and a voltage rating of 600 VAC / 750 VDC, it is ideal for high-heat environments requiring excellent dielectric strength and flame resistance.

Technical Specifications

  • Standards:

  • UL 758 (UL Style 3321)

  • CSA C22.2 No. 210

  • Voltage Rating: 600 V AC / 750 V DC

  • Temperature Rating:

  • Continuous operation: -40°C to +150°C

  • Conductor temperature limit: +150°C max

  • Flame Test:

  • UL Horizontal Flame Test

  • Spark Test:

  • Dielectric strength up to 7.5 kV, depending on conductor size

  • Bending Radius:

  • Flexing: 10 × cable outer diameter

  • Fixed: 5 × cable outer diameter

Construction

  • Conductor: Stranded annealed copper, bare or tinned

  • Insulation: Cross-linked Polyethylene (XLPE)

  • Heat-, moisture-, and chemical-resistant

  • As per UL 1581, Class 43,

Key Features

  • High-Temperature Rated: Withstands up to 150°C, ideal for heat-intensive applications

  • Voltage Capability: 600 V AC / 750 V DC

  • XLPE Insulation: Durable, with excellent electrical and mechanical properties

  • Chemical Resistance: Resists oils, acids, solvents, and moisture

  • Flame Retardant: Self-extinguishing per UL FT2

  • RoHS & REACH Compliant: Safe for modern applications

Typical Applications

  • Internal wiring in:

  • Motors and transformers

  • Switchboards and electrical panels

  • HVAC units, lighting fixtures

  • Automotive and EV battery packs

  • High-temp zones in industrial automation, renewable energy, and railway systems

AWG Metric Cross Sectional Area (Sq.mm) No of Strand / Strand Diameter (mm) Average Insulation Thickness (mm) Nominal Cable Diameter (Approx)
260.1287/0.160.772.10
240.2057/0.200.772.20
220.3247/0.250.772.40
200.5197/0.310.772.50
180.82316/0.260.772.80
161.31726/0.260.773.10
142.0841/0.260.773.50
123.3165/0.260.774.00
105.26105/0.260.774.60
88.367168/0.261.156.20
613.3266/0.261.157.20
421.15420/0.261.158.50
233.62665/0.261.5311.00
142.41882/0.262.0312.80
053.491029/0.262.0313.80
0067.431330/0.262.0315.20
00085.011715/0.262.0317.25
0000107.202205/0.262.0320.20

Dimension mention on above table are indicative only .

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