Does it mean you can feed a nonlinear load with a common grounded wire?!!!:?
Neutral for each Phase
- Thread starter j rae
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jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Yes. The informational note is not enforceable.
210.4 Multiwire Branch Circuits.
(A) General. Branch circuits recognized by this article shall
be permitted as multiwire circuits. A multiwire circuit shall be
permitted to be considered as multiple circuits. All conductors
of a multiwire branch circuit shall originate from the same
panelboard or similar distribution equipment.
Informational Note: A 3-phase, 4-wire, wye-connected power
system used to supply power to nonlinear loads may necessitate
that the power system design allow for the possibility of
high harmonic currents on the neutral conductor.
- Location
- Illinois
- Occupation
- retired electrician
Yes, and it is a very common instatallion. In some cases the common grounded conductor is larger than the phase conductors, but not always.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
I get specs for a #10 neutral to the first break off junction point on a 20A MWBC for fluorescent lights, computers, and such a lot.
- Location
- Illinois
- Occupation
- retired electrician
Specs that were influenced by the Copper Development Association
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Specs that were influenced by the Copper Development Association
Prolly, it is when I get a spec for a #10 EGC for the same circuit that I get really irked.
Especially since it is usually ran in bonded EMT/RMC.:rant:
Do you pay attention to that? I know for some places, for example hazzerdious locations or pools, you may need it. But when you get a store or residential work and the architect states "EMT with grounding conductor" do you put it in, or let the EMT be the ground?
Thanks
Mike
Thanks
Mike
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
I work for a defense contractor on projects for the military, so yeah-I pay attention.
I do not have a clue as far as value engineering a store or resi project, previously I worked for a college.
I have not done a resi project since around 2000-2001 or standard commercial since 2010.
IMO only stamped EE drawings are enforceable, not architects or designers.
- Location
- Illinois
- Occupation
- retired electrician
If the design calls for the EGC, then you provide and install it.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
The service and/or any feeders do use a single grounded conductor, if there is harmonic concerns it may be sized same or even larger than ungrounded conductors.
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