Hi Doug:
IEC 60950 differs from IEC 60664 in that the clearances
are for sea level, not 2000 meters. See Table 18, Note
2.
Since 664 is the reference standard, I suppose one can
ask whether the 950 authors correctly transposed the
2000-meter clearances from 664 to sea level clearances
for 950.
I have had the impression that the 950 authors have
always taken a very conservative approach to clearances
and have invoked distances larger than those found in
664.
Regards,
Rich
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