Pete Tarver pointed out that: >>>The primary protector at a building entrance limits the voltages available to do harm to 600Vrms (assumed sinusoidal). There might also be secondary protection on telecommunication lines that include supplemental overvoltage protection that limits the voltage downstream to even lesser levels.<<<<
Another concern is that in the event of a lightning strike or power cross, an overvoltage device on the equipment side rated lower than 600 V will fire before the 600V outside protector, shunting all follow-current through the unprotected premesis wiring and through the equipment itself. Greg Galluccio www.productapprovals.com ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
