Hi all, Assume a fire alarm detection system. 10 smoke detectors are connected in series on a loop and both ends of the loop is connected to the fire alarm panel. Shielded cable is used and the shield is connected through the whole loop.
So, how do we carry out the surge test on the loop? The alarm panel and the detectors are all EUTs. As far as I understand IEC61000-4-5:1995 chapter 7.5, I will insert an extra 20 meter shielded cable between each detectors and then I will drive the surge pulse onto the shield in order to test one of the detectors. Then I move the extra 20m cable to the next detector and surge test it. If this is correct, why can't we just put the surge pulse onto the shielded loop and assume that the whole loop was tested at once? Best regards Amund Westin, Oslo/Norway ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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"
