Hi John:


>   >    No, this is not much of an issue for the U.S. (unless your facility
is 
>   >    actually affecting the utility);
>   
>   ... or frying the neutral conductors with third-harmonic current.

In the USA, this has largely been fixed by a change in
the USA National Electrical Code.  

When the load is largely electronic (off-line rectifiers)
the Code now requires a larger neutral conductor in three-
phase distributions.

Many constructions, while supplied from a three-phase source,
are wired as single-phase.  So, in this case, the neutral
only carries the current of one phase, and we don't "fry"
the neutral.


Best regards,
Rich





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