Phase converter/transformer

This is the second phase of the body shop job we did previously. In phase 1 we upgraded the meter, mast, and breaker panels. In phase 2 we ran a 100 amp circuit to a phase converter, which takes the 240 volt single phase, and makes a 3rd leg of 240 volts. We then ran that to a fused disconnect, because you should never start a phase converter on a load, even just a transformer. From the disconnect we ran to the transformer to step up the voltage from 240 volts to 480 volts, and then ran to the control panel for the air compressors. Phase converters are a good option for folks who would have to pay an inordinate amount to get 3 phase run to their property. You can just wire up the motor(s) for low voltage, meaning 240 volts, but for this application it was more cost effective to step up to 480 volts. We also ran a 20 amp receptacle circuit for the air dryer. We used PVC conduit for all of the hard piping, and used liquid-tight flexible conduit to attach to the transformer, phase converter, and control panel. Whenever you attach to a device that has any vibration, even a little, it's a good idea to use flexible conduit to prevent more mechanical noise, and possible loosening of connectors. We also added rubber pads under the transformer and phase converter to absorb some of the vibration.

The compressor room fully assembled.

PVC conduit to the compressor room. Notice the expansion joint to allow for expansion/contraction of the PVC.

Interior of the breaker panel.

PVC conduit to the breaker panel.

Right to left: Phase converter, fused disconnect, transformer.

Close up of the fused disconnect. If you look close, you can see the wires for the 20 amp receptacle are pulled through.

This is the phase converter. It uses a 3 phase motor's windings, and some capacitors, to make another "phase".

Interior of the transformer. We color coded the 240 volt phases black, red, and blue. The 480 volts phases are brown, orange, and yellow.

PVC conduit going from the transformer and disconnect to the control panel and receptacle.

Conduit from the ceiling down to the control panel and receptacle.