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What size wire to run 225' underground?
Depends on the load it will carry which you failed to list.
What size aluminum wire on 225 amp?
300 kcmil @ 75°
What size feeders for two 225 amp panelboards?
Use AWG #1 copper service entrance wire and #4 copper ground wire.
What size wire is needed for 400 amp 480 volt service?
A 500 MCM wire with an insulation factor of 90 degrees C is rated at 430. Most 400 amp services will use parallel wires on each leg to feed the circuit. A 3/0 wire with an insulation factor of 75 and 90 degrees C is rated at 200 and 225 amps respectively. The insulation rating of these conductors will be 600 volts.
What size of wire use and breaker for a 30 hp 220 volt 3 phase compressor?
Wire size calculations and breaker sizing are based on the motors amperage. If the amperage is not known the electrical code book rating are used by electricians. The book states that a three phase 30 HP motor draws 80 amps. An 80 amp motor needs a conductor rated at 100 amps. A #3 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 100 and 115 amps respectively. Non time delay fuses rated at 225 amps, time delay fused rated at 125 amps or a breaker rated at 200 amps. These figures can probably be reduced if the actual motors amperage rating is used in the calculation.
