Hi John:
> >In the USA, this has largely been fixed by a change in
> >the USA National Electrical Code.
>
> There must be quite a number of installations that are not yet upgraded.
Where a problem existed, it was fixed by pulling
another neutral.
> Are there any other problems appearing in the field which can be
> reliably determined as due to concentrations of non-linear loads of less
> than 3 kVA or so?
Probably not.
The only other problem that I know of is distribution
transformer overheating. But, I believe such
transformers are very much larger than 3 kVA, so 3 kVA
of non-linear loads would have very little effect.
Best regards,
Rich
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