Re: 208 3PH question

What's that Lassie? You say that ATP* fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Sun, 11 Jan 2009 00:22:43 -0500:


"dan" <notme@xxxxxxxxxxx> wrote in message
news:4968c855.1070703@xxxxxxxxxxxxxxxxxxxxxx
What's that Lassie? You say that DoN. Nichols fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by 10 Jan 2009 05:36:28 GMT:

You need a clamp-on wattmeter or something similar
to get meaningful measurements.

Damn. That's what I was afraid of.

You can at least calculate the *worst-case* operating cost,
which assumes unity power factor. In any real situation, the cost will
be less (usually significantly less) than that calculated from clamp-on
ammeters. It *can't* cost more than your calculations show -- only
less.

Thanks, that's good to know.
--

Dan H.

Do you have access to a good meter like a Fluke 87 and a clamp-on
attachment? If you can leave it running with the clamp-on attached you could
get max, min and average readings for the whole day.

Nope. Just an old clamp-on that I picked up at a yard sale once.
It's a voltmeter too, but it needs funny leads that I don't have.
(they screw onto recessed studs)
--

Dan H.
.

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