According to IEWC, the ampacity of 4/0 welding cable for 600-volt in-line applications is 315 Amps when the copper temperature is 60 C, and the ambient temperature is 40 C.

The ampacity for secondary voltage applications is as follows based on the length of the total circuit:

• For 400' run - 200 Amps
• For 350' run - 200 Amps
• For 300' run - 250 Amps
• For 250' run - 300 Amps
• For 200' run - 350 Amps
• For 150' run - between 450 Amps and 550 Amps
• For 150' run - 600 Amps

Note that the secondary voltage implies applications that are not 600 volts/

The ampacity of the particular 4/0 welding cable depends on the cable's insulation material, ambient temperature, and cable run length.

Applications of 4/0 Welding Cable

Now that we have figured out the ampacity of the 4/0 welding cable, let's look into its common applications. Given its high ampacity, the cable is used for heavy-duty and industrial applications.

The most common use of 4/0 welding cable is to connect welding machines to their electrodes and grounding clamps. Its large diameter allows it to handle the high currents required for welding operations. Thus, the cable is suitable for large-scale industrial welding, construction welding, and any application requiring extended cable lengths without significant voltage drop.

4/0 welding cable can also connect generators and external power supplies to equipment that requires a high current supply. This is often seen in temporary setups, like construction sites or outdoor events where heavy machinery or sound and lighting equipment need power.

4/0 welding cable can be used in renewable energy installations, such as solar or wind farms, to connect battery banks because it can handle high currents. This ensures efficient power flow between batteries and to the inverter. Welding cable is flexible, durable, and UV-resistant, which makes it perfect for renewable energy uses.

Welding cable is suitable for temporary emergency power solutions, such as connecting portable generators to buildings or critical equipment during power outages.

A 4/0 welding cable can be used for high-current connections in boats and ships. These include connections between large marine batteries and motors. These cables have the necessary resistance to harsh conditions.

The 4/0 welding cable also connects and powers heavy machinery in industries and manufacturing plants.

In automotive applications, especially in custom builds or modifications with high-current draw components (like winches or high-performance audio systems), a 4/0 welding cable can provide the necessary power without significant voltage drop.

What is the temperature rating of a 4/0 welding cable?

The temperature rating for 4/0 welding cable is -50 C to 105 C for class M welding cables, and -50 C to 90 C for class K welding cables. These temperature ratings do not depend on cable size and voltage. You can find welding cables at excellent prices at NNC.