Just in from Square D [RE-wrenches]

[Eric Smiley]

>His letter indicates that he is applying this to ungrounded 125Vdc
>systems. Don't know why that makes a difference, but I'm sure he could
tell
us.

An ungrounded system will have a double pole breaker opening both the
positive and the negative, which will do a much better job of
suppressing arcs.



----------------------------------------------------------------------
Eric Smiley
Project Leader - BCIT Technology Centre
Photovoltaic Energy Applied Research Lab (PEARL) - BCIT
ph: (604)432-8657 www.bcit.ca/~tc/pearl/index.htm

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