In order to size your cable, you should first measure the length required to make the connection between the power source and the heating/melting device.
Next, calculate the amount of copper conductor required to carry the current. A water-cooled cable, and/or bus, needs approximately 350 MCM of copper cross-section for every 1,000 amps of current. Conversely, an air-cooled system requires approximately 3 times the copper conductor to carry the same current. Induction-based melt systems must consider the operating frequency into account when determining the optimal conductor cross-section.
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