The OP question is if one leg to ground provides 120 volts to run a
device like a vacuum cleaner, or pressure washer.

Long as it runs a vacuum cleaner.

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Christopher A. Young
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..


"harry" wrote in message
...

I did. You didn't describe that limitation but you could still be a
long
way from completely wrong with only a meter if you only had access
to
the phase legs. Since a "Y" connection neutral is always bonded to
ground I could still get the same readings I described by placing
one of
the meter probes on ground.- Hide quoted text -

- Show quoted text -

But you still wouldn't know whether it was star or delta connected.