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<font face="Helvetica, Arial, sans-serif">Dan,<br>
<br>
690.10(C) doesn't say no. It says that if you have a single 120V
inverter output connected directly for a 120/240 panel then you
can't put a 240V load in the panel-- in this case you'd either
have L connected to both phases of the panel or I guess you could
just use half the breakers in the panel. For a 240V load it would
just see 0 volts phase to phase, but for a multi-wire branch
circuit with current on both legs you'd potentially overload your
neutral conductor.<br>
<br>
Now when you use either a 240V inverter (or two stacked 120s) or
an autotransformer between the inverter and the panel, 240V loads
are fine since you have two lines 180 degrees out of phase and
voila, 240V. 690.10(C) wouldn't apply to this situation since your
inverter(s) would be supplying 240V (not 120) to your 1P 3W panel.<br>
<br>
DKC<br>
<br>
</font>
<div class="moz-cite-prefix">On 2014/3/19, 20:40, Dan Fink wrote:<br>
</div>
<blockquote
cite="mid:CAF+3Lndpf45FusFTpjyNT9N7zAEmYMXK1Zctt2-YXt+OLut6OA@mail.gmail.com"
type="cite">
<div dir="ltr">Esteemed Wrenches;
<div>Can anyone here help me with some simple talking points for
clients installing off grid systems? 240 Well pumps hard wired
to panel breakers are common, but everybody (who has even a
chance of surviving up here in middle of nowhere way off grid)
NEEDS a 240v welder outlet in the garage/workshop. But
690.10(C) says no.</div>
<div><br>
</div>
<div>Am I missing something obvious? What do I tell these
potential clients?</div>
<div><br clear="all">
<div>Dan Fink,<br>
Executive Director;<br>
Otherpower<br>
Buckville Energy Consulting<br>
Buckville Publications LLC<br>
NABCEP / IREC accredited Continuing Education Providers<br>
970.672.4342<br>
<br>
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