Industry best practice recommends using parallel wire runs instead of a single large conductor. When choosing wiring for a 600 amp 3 phase electrical service, you’ll have to properly size conductors and grounding. Selecting the Appropriate Wire Size for a 600 Amp 3-Phase Ensuring appropriately sized grounding maximizes safety. The NEC provides ground wire sizing guidance. Ambient Temperature Impacts Sizingīigger wires can handle higher temperatures and more current. Longer wire lengths mean higher resistance and voltage drops. Conductor Length – Bigger Wire for Longer Runsīuilding wiring can vary from short panel feeds to 100 foot+ branch circuit runs. For a short run to an adjacent panel, a 1-2% drop is fine. The NEC recommends keeping voltage drop under 3% at the farthest electrical outlet in a branch circuit. Excess voltage drops can lead to poor equipment performance or shutdowns. Longer wire runs to the electrical panel will experience higher voltage drops. This allows equivalent wire sizing for copper and aluminum conductors.Īgain, a 600 amp service wire size of 1500 kcmil copper or 2000 kcmil aluminum will do the job.Īnd because a parallel feed is recommended for practicality (1500 kcmil and bigger wires are harder to acquire, and working with these sizes is time-consuming) two 350 kcmil copper wires or two 500 kcmil aluminum wires will suffice. The NEC provides adjustment factors to account for differences in resistance and ampacity. Copper has lower resistance, so a smaller size handles the same amperage as aluminum. You can use either copper or aluminum wires for a 600 amp, 240V service.
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