Use this welding cable size chart as a bounded starting point—not a universal answer. Welding cable size requires more than matching gauge to amperage. Use the maximum welding current, duty cycle, and total combined electrode-plus-work cable length. Your machine-specific manual remains the final authority.
Welding cable size chart for 60% duty cycle
The values below reproduce Table A.1 from the Lincoln Electric LN-25 operator manual. They apply only to the listed currents, 60% duty cycle, and total cable-length bands. Lincoln says both electrode and work cable must be sufficient for the maximum weld current and total cable length used.
Length-band note: Lincoln prints adjacent ranges that share the 100, 150, and 200 ft boundary values. If your combined length is exactly at or near a shared boundary and the adjacent cells differ, use the larger cable size or obtain model-specific guidance. On narrow screens, scroll the table horizontally to read every length band.
| Weld current at 60% duty cycle | 50–100 ft total | 100–150 ft total | 150–200 ft total | 200–250 ft total |
|---|---|---|---|---|
| 200 A | 2 AWG | 2 AWG | 1 AWG | 1/0 |
| 300 A | 1 AWG | 1 AWG | 1/0 | 2/0 |
| 400 A | 2/0 | 2/0 | 3/0 | 3/0 |
| 500 A | 2/0 | 3/0 | 3/0 | 4/0 |
Source boundary: Do not interpolate. This table supplies no recommendation below 200 A, above 500 A, below 50 ft, above 250 ft, or at a duty cycle other than 60%. The LN-25 table does not state conductor material or cable temperature rating, and it is not an NEC building-wire ampacity table. Confirm cable construction in the exact machine manual or cable specification.
How to measure total welding-circuit length
Electrode lead + work lead = total cable length. A 50 ft electrode lead plus a 50 ft work lead equals a 100 ft total circuit. Do not enter only the one-way distance from the welder to the work.
The Lincoln Electric Weldanpower 125 manual describes this welder-to-work-and-back total circuit and increases conductor size as current and combined length rise.
Why amperage and distance both matter
Lincoln states that the size of the electrode cable and work cable must be sufficient for the maximum weld current and the total cable length to be used, and refers the reader to Table A.1 for the combination. Both conditions are read together; neither one alone selects the cable.
The exact step-up is not universal. It depends on the manufacturer’s current, duty cycle, cable construction, and circuit-length assumptions. This guide does not impose an unsupported universal voltage-drop percentage.
Duty cycle changes the answer
The chart is explicitly labeled for 60% duty cycle. It cannot be relabeled for 100% duty cycle or used to imply a continuous-operation size. Use the duty-cycle rating that applies to the intended weld current in your machine manual. If the conditions do not match, obtain model-specific guidance.
The 2/0-versus-#4 question
No condition-free 2/0-versus-#4 ampacity claim is supported here. The verified Lincoln table includes 2/0 but does not include #4 AWG. Compare sizes only in a manufacturer table that lists both under the same current, duty-cycle, construction, and total-length conditions.
Welding cable is not an input extension cord
This guide covers external weld-output leads: the electrode-side cable and work-return cable. It does not size an input power cord, building circuit, extension cord, or internal wiring harness. This guide uses marked conductor gauge and exact manufacturer specifications, not an outside-diameter conversion.
This guide provides no aluminum-to-copper equivalency. Do not infer conductor material from AWG notation alone; use the marked cable and manufacturer specification.
Choose assembly length and connector style
- Measure and add both leads.
- Identify the connection at the machine, electrode holder or feeder, and work clamp.
- Match plug, receptacle, lug, or output-stud terminations.
- Choose an assembled lead or bulk cable.
- Confirm conductor size, finished length, connector type, and manufacturer current/duty-cycle rating.
Browse welding cable accessories and connectors, welding electrode holders, and stick welding accessories where they match your setup.
Connections and operating checks
The Lincoln LN-25 manual directs the operator to make a tight metal-to-metal work connection, says poor work-lead connections can cause poor welding performance, and specifies securing its electrode cable with the equipment’s strain-relief clamp.
- Follow the installation and servicing instructions in your own machine's operator manual before installing or servicing output cables.
- Spread out coiled welding cable before use. The OSHA general-industry arc-welding rule identifies this as a precaution against overheating and insulation damage.
- Do not use a cable with damaged insulation or exposed conductor. OSHA’s general-industry rule requires replacement; OSHA’s interpretation explains that construction rules differ, so follow the rule that applies to the workplace and the manufacturer’s instructions.
- Join cable lengths only with connecting means specifically intended for that purpose and insulated for the service conditions. Do not improvise a bare or underspecified splice.
Follow the inspection, connection, and maintenance instructions for every part of the exact setup. This page does not replace the applicable workplace safety standard or define a universal pass/fail inspection procedure.
Welding cable buyer checklist
- Welder or feeder make, model, and code/serial information
- Maximum weld current and duty cycle at that current
- Electrode-lead, work-lead, and total combined lengths
- Manual-specified conductor size, material, insulation, and temperature rating
- Machine-end connector, lug, or stud size
- Holder, feeder, or work-clamp termination
- Complete assembly or bulk cable
- Exact assembly current/duty-cycle rating
Shop welding cables and welding leads
Example product pages retained for a mandatory prepublication recheck: example welding cable product page and second example welding cable product page. Conductor size, connector configuration, length and availability are stated on those product pages, not here.
Frequently asked questions
What size welding cable do I need?
Use maximum weld current, duty cycle, and total combined electrode-plus-work cable length, then consult a manufacturer table with matching conditions.
Does welding cable length include both leads?
Yes for the Lincoln guidance used here. Add the full electrode-cable and work-cable lengths.
Is 2/0 welding cable always good for 400 amps?
No. In the cited Lincoln table, 2/0 applies at 400 A and 60% duty cycle for 50–150 ft total length; that same table specifies 3/0 for 150–250 ft. Other conditions can differ.
Can I use this chart for 100% duty cycle?
No. It is a 60% duty-cycle table.
Is welding cable size based on one-way distance?
Not in the cited guidance. Use the welder-to-work-and-back combined circuit length.
What if my total length is exactly 100, 150, or 200 feet?
The source prints adjacent bands that share those boundary values. If adjacent cells differ, use the larger cable size or obtain model-specific guidance rather than choosing the smaller size from an ambiguous boundary.
Can outside diameter identify the gauge?
This guide does not convert outside diameter to gauge. Use the marked conductor gauge and exact product specification.
What if my machine manual disagrees?
Follow the machine manual.
Is this welding cable size chart universal?
No. It reproduces one verified manufacturer table for the listed 200–500 A, 50–250 ft, 60%-duty-cycle conditions. Confirm welding cable size in the exact machine manual whenever equipment or conditions differ.