NEMA 6-50 Heavy Duty Welding Extension Cable
50 Amp EV Power Extension Cords

NEMA 6-50 Extension Cord, Custom Heavy Duty Welding Extension Cable | 50 Amp EV Power Extension Cords | UL Listed

  • High-Amperage Reliability: Supports 50A continuous loads with low-resistance wiring, preventing overheating during prolonged use.
  • Rugged Outdoor Durability: STW or SOOW jacket provides flexibility in cold weather (-40°F) and protection against UV, chemicals, and impacts; suitable for indoor/outdoor applications.
  • Visual Safety Cues: Integrated LED indicators on plugs and ends signal power flow and ground integrity for quick diagnostics.
  • Broad Compatibility: Works with major brands like Miller Electric welders, Lincoln Electric, and EVSE from ChargePoint or JuiceBox; also ideal for submersible pumps or CNC machines.
  • Customization Flexibility: Options include open-end pigtails, eyelet terminations for hardwiring, custom colors (e.g., yellow for visibility), and reinforced strain relief; eco-friendly RoHS materials.
  • UL-listed (per UL 62 standards for flexible cords) and cUL certified for North American safety.
  • RoHS directive compliant, ensuring no hazardous substances like lead or phthalates.
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NEMA 6-50P, NEMA 6-50R Extension Cords

The NEMA 6-50 heavy-duty extension cord is engineered for high-power, industrial-grade applications, including MIG/TIG welders, plasma cutters, Level 2 EV chargers (e.g., Tesla Mobile Connector or J1772 adapters), generators, and heavy machinery. This 3-prong locking cord (NEMA 6-50P male to 6-50R female) delivers up to 12,500 watts at 250 volts, with a robust design that minimizes voltage drop over long runs, ensuring consistent performance in workshops, garages, or outdoor sites. UL-listed for electrical safety, it features pure copper conductors and a flexible, weatherproof jacket to withstand abrasion, oil, moisture, and extreme temperatures. Custom lengths from 6 feet to over 100 feet are readily available from manufacturers, supporting tailored solutions for mobile welding rigs, EV home setups, or commercial installations.

Technical Information

    • Connectors: NEMA 6-50P (male) to NEMA 6-50R (female).2 Hot Wires (X, Y) + 1 Ground (G) – No Neutral.
    • Electrical Ratings: 50A Max, below listed shows lighter duty.12,500W (50A × 250V).
    • Safety Certification: UL Listed, cUL
    • Colors: Black is standard; custom available
    • Operating Temperature:Up to 105°C for the cord
    • Cable Length Options:Custom (e.g., 6FT, 15FT, 25FT, 50FT; up to 100FT available
    • Compatibility:Welders, EV Level 2 chargers, generators, industrial tools; NEMA-compliant for U.S./Canada.
LA008C 6/2 + 8/1, 6/3 STW, SOW, S, SO, SOO, SOOW, ST, STO, STOW, STOO, STOOW 50/250
12/3 SJT, SJTW, SJTO, SJTOW, SJTOO, SJTOOW, S, SO, SOW, SOO, SOOW, ST, STW, STO, STOW, STOO, STOOW 25/250
10/3 SJT, SJTW, SJTO, SJTOW, SJTOO, SJTOOW, S, SO, SOW, SOO, SOOW, ST, STW, STO, STOW, STOO, STOOW 30/250
8/3, 8/2+10/1 S, SO, SOW, SOO, SOOW, ST, STW, STO, STOW, STOO, STOOW 40/250

Extension Cable Applications:

This cable is versatile and built for high-power equipment:

  • Welding: The primary application. Provides a safe and reliable power extension for 50-amp industrial welding machines and plasma cutters.
  • Electric Vehicle (EV) Charging: Serves as a high-power extension for 50-amp EVSE (Electric Vehicle Supply Equipment) charging stations, such as those for Tesla, Chevy, Ford, and others using a NEMA 6-50 outlet.
  • Industrial Machinery: Powers heavy-duty equipment like large industrial ovens, compressors, and CNC machines that require a 250V, 50-amp connection.
  • Workshop & Garage Use: An essential tool for any serious workshop needing flexible power for high-demand tools.

NEMA 6-50 Extension Cord Manufacturer

CablesGo manufactures heavy-duty NEMA 6-50 power extension cords, engineered with a 50 Amp, 250V configuration to extension reliable, high-current power for demanding applications such as welding equipment and EV / Industrial machinery. Produced in our certified 30,000+ sqm Ningbo facility, every unit is guaranteed through 100% in-house Hi-Pot and continuity testing, ensuring full compliance with UL standards. We provide flexible customization of cord length and jacket color with a competitive 50-piece MOQ, backed by global operations that ensure dependable 10-15 day lead times and cost-effective pricing.

Sample availability

3-5 working days
MOQ

50 pieces for custom orders
Production lead time

10-15 working days
Export packaging standards

Export Cartons,or custom requirements, Pallets

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