Hi Chris, Andrew, Carmen:
With regard to safety, both effects of altitude
must be considered:
1) effect of air pressure on the electric
strength of air (clearance), and
2) effect of lower density air on the
temperature of solid insulation.
(Creepage is a surface degradation phenomenon
that is solely a function of working voltage,
and is independent of altitude. But, creepage
can never be less than the parallel clearance,
so the creepage may also be affected for those
situations where the minimum clearance is
greater than the allowed creepage.)
Best wishes for the New Year,
Rich
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