How to rewire a 3 phase generator to a single phase

Updated July 20, 2017

If you have three-phase generator but wish to use it to power single-phase devices, rewiring is generally very difficult. A much simpler solution is to install a converter that transforms three-phase power into single-phase electricity. A converter offers additional flexibility, because you can always hook up single-phase power to the device when it becomes available and use the three-phase generator for three-phase systems elsewhere. If you are working with machines that carry light to moderate loads, a static converter will do. A rotary converter is better suited for higher loads, as well as for running multiple machines at once.

Sit the converter close the machine to which you will deliver power. Make sure the converter sits flat and stationary.

Trace the mounting holes onto the mounting surface using a marker. Drill the holes and insert anchors with internal threads. Set the anchors in place using a hammer and setting tool.

Bolt the converter in place using a ratchet and socket.

Set up three lengths of wire than run from the generator to the converter. Set up three additional lengths of wire than run from the converter to the machine. Two of these wires are power leads; one wire is the grounding wire.

Strip the ends of the wires with wire strippers.

Attach the generator's first phase to input A on the converter using a flathead screwdriver, then attach the converter's output B to the device's input L2.

Attach the generator's second phase to input C on the converter using a flathead screwdriver, then attach the converter's output C to the device's input L3.

Attach the ends of the ground wires to the grounding screws of the generator, converter and machine using a flathead screwdriver.

Test the circuit with a megger. Turn the power on, and test the machine.

Things You'll Need

  • Phase converter
  • Wire terminals
  • Wire crimpers
  • Ratchet and socket
  • Flathead screwdriver
  • Marker
  • Hammer drill
  • Masonry bit
  • Threaded anchors
  • Hammer
  • Setting tool
  • Megger
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About the Author

Eric W. Thompson began his writing career in 1996 and is now a member of the All-USA Academic Team, having been featured in "USA Today" as one of the top 20 community college students in the country. He is currently taking a break from earning an undergraduate degree in contemplative psychology at Naropa University.