In article , Gunner says...

On 12 Jun 2004 20:42:59 -0700, jim rozen
wrote:

Eeeek. I've done a lot of sketchy things in the past, but
I would really really try to avoid doing that - wiring a
machine for 240 with one leg always hot (unswitched). Aside
from the code violation, I don't think I could sleep at
night knowing that the motor had 120 between the windings
and the frame, and that an insulation breakdown could
cause trouble.

I have an ingersol-rand 5 hp 3ph air compressor that I rebuilt for a
customer (and he aint getting it until he pays me..) that only has two
pair of contacts for the power. When it came to me, the third leg was
constant hot. And its factory original, which is completely weird.

Maybe it was specially designed to run on grounded leg delta
service? My experience is that manufacturers tend to leave
the specifics of contactors and wiring to the local electricians,
so machines will come missing the last link that hooks up to
the local service.

Jim

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