Lucky Dave fired this
volley in roups.com:

Have three phase 240 volt in my shop. Need to change plug to 240v
single
phase

While all the small home shops are dying to get 3-phase, instead of using
converters and VFDs, you have it.

If you have 3-phase, then you already have single-phase.

If it's delta, pick any two power pins (NOT ground!), and get 240 single-
phase. If its Wye, pick any two power pins (NOT ground!), and get 208
single-phase.

You don't get 240V single phase from Wye service without a boost
transformer (cheap).

You need to know which service you have, but it's easy to determine with
a resistive load (like a 240V incandescent bulb, or two 120V bulbs of the
same wattage in series) and a voltmeter. Just apply the load across any
two power pins, and check the voltage.

If it's 240, you have delta service, if 208, you have Wye service.

LLoyd

LLoyd

LLoyd