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There are two distinct questions here. To determine the wire size to carry 15000 volts the circuits load amperage must be stated.

The wire size for a 550 amp service is, an 800 MCM copper conductor with an insulation factor of 90 degrees C. This conductor is rated at 555 amps. Parallel 250 MCM will give you a total capacity of 580 amps. A triple run of 2/0 will give you a total capacity of 585 amps.

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Q: What wire size for 15000 Volts and 550 amp service?
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