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WARNING: If you are asking this kind of question, you probably do not have the knowledge of a trained and qualified electrician. It is ESSENTIAL that you have that knowledge, both from a legal standpoint and from a safety standpoint. It is HIGHLY RECOMMENDED that you consult a properly trained and qualified electrician on this matter. In fact, most commercial installations, of which 208V certainly sounds like, REQUIRESa licensed electrician.

A load of 6500 watts at 208 volts will draw a current of 31.25 amps. For the US NEC, that corresponds to a wire size of AWG 8, which is rated for 40 to 55 amps, depending on insulation, temperature, and installation. However, 31.25 amps is close to the limit of 80% of 40 amps and, depending on code and circumstances, you might need to go to AWG 6, which would give you a rating of 55 to 75 amps.

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Q: What 6000 watt water heater wire size?
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