Marco:
From the code:
Nonlinear Load. A load where the wave shape of the steady-state current
does not follow the wave shape of the applied voltage.
FPN: Electronic equipment, electronic/electric-discharge lighting,
adjustable-speed drive systems, and similar equipment may be nonlinear loads.
Loads with resistor characteristics such as heating loads are
linear. Loads with rapid switching are nonlinear, like switching power
supplies.
Is an inverter non-linear? I think it is, but that is just a guess. Also
poorly defined is the phrase "major portion."
I hope this helps.
William
At 10:23 PM 5/13/2010, you wrote:
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How about some clear definitions-for-dummies of 1) linear loads and 2)
non-linear loads?
marco
Marco:
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.
Code citation below (2008):
310.15(4) Neutral Conductor.
(c) On a 4-wire, 3-phase wye circuit where the major
portion of the load consists of nonlinear loads, harmonic currents
are present in the neutral conductor; the neutral conductor
shall therefore be considered a current-carrying conductor.
William Miller
PS: Who's buying dinner, you or your partner?
Wm
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