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>As previously discussed though, there may be problems with the brushes
"dusting." Carbon dust can complete a low voltage path and thereby initiate
a
low voltage arc that has absolutely nothing to do with altitude. Why and if
brushes act worse in (high altitude) service will have to be answered by
someone else.<

The issue is with the increased amount of carbon dust created due to the
nature of the brushes, there is greater likelihood of an arcing path
tracking the powder.  Less dense air will permit an arc to jump a greater
distance than at sea level pressure.

Gary




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