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Adrian Midgley wrote: > Paul Weaver wrote: >> Common in telecoms apps rooms, everything runs off ~50VDC, backed up by >> big batteries. Has a secondary advantage of being a "low voltage" device >> and not needing the same testing as a normal apps room. >> >> > > Big high current DC supplies to several devices have their own > interesting behaviours though, involving induction and possible high > voltages when things are switched. And, according to a number of electrical engineers I know, they're a much higher risk if they decide your body is a convenient conductor. James -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html