How many amp service do you need to handle 450 volts?

Answer 1

This depends solely on the load you might need a 15 amp service or a 1200 amp service. To find out look at the installation instructions and it will tell you what size the service supply needs to be.

Watts = Amps times Volts

Amps = Watts divided by Volts

Volts = Amps divided by Watts

Example

1500 Watt unit will pull 12.5 Amps at 120 Volts

or

1500 Watt unit will pull 3.26 Amps at 460 volts

or

A 460 volt unit rated for 34 amps will be using 15.64 kWh or 15,640 Watts

Also the higher the voltage, the lower the Amperage, however, the wattage will stay the same

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The question is asking about two different values. Voltage is an insulation value whereas amperage is a conductor size. The basic insulation values are 300, 600 and 1000 volts. In the question on this service, a insulation factor of 600 volts will be used for the conductors. The amperage of a service is based on the connected load that needs to be supplied. The load can be an individual load or as in a distribution panel a variety of loads. At 460 volts, the service can be either a three phase service or a single phase service. Once the load amperage has been established, the wire size for the service can be calculated. Once the wire has been sized, the breaker used to protect the wire from being overloaded will be calculated.