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<font size=3>Marco:<br><br>
From the code:<br><br>
<i>Nonlinear Load. A load where the wave shape of the steady-state
current does not follow the wave shape of the applied voltage.<br>
FPN: Electronic equipment, electronic/electric-discharge lighting,
adjustable-speed drive systems, and similar equipment may be nonlinear
loads.<br><br>
</i>Loads with resistor characteristics such as heating loads are
linear. Loads with rapid switching are nonlinear, like switching
power supplies.<br><br>
Is an inverter non-linear? I think it is, but that is just a
guess. Also poorly defined is the phrase "major portion."
<br><br>
I hope this helps.<br><br>
William<br><br>
<br><br>
At 10:23 PM 5/13/2010, you wrote:<br>
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How about some clear definitions-for-dummies of 1) linear loads and 2)
non-linear loads?<br>
<br>
marco<br>
<br>
Marco:<br><br>
Will non-linear loads be expected? If so, the neutral is considered
to be a current carrying conductor and needs to be counted. If no
non-linear loads, then the neutral is not counted.<br><br>
Code citation below (2008):<br><br>
<i>310.15(4) Neutral Conductor.<br>
(c) On a 4-wire, 3-phase wye circuit where the major<br>
portion of the load consists of nonlinear loads, harmonic currents<br>
are present in the neutral conductor; the neutral conductor<br>
shall therefore be considered a current-carrying conductor.<br><br>
<br>
</i>William Miller<br><br>
PS: Who's buying dinner, you or your partner?<br><br>
Wm<br><br>
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