<sa9d1398.077@sao0002n>, SERGIO LUIZ DA ROCHA LOURES SERGIO <sergioro...@siemens.com.br> inimitably wrote: >Can the group tell me if there is any requirement about isolations of lead >acid >battery terminals? >We have a 48V equipment powered by lead acid batteries. The negative of the >batteries set is connected to the enclosure. When the batteries need to be >replaced, short circuit happens if the tool used to detach the connectors >touch >the enclosure and the positive of the batteries. >Information to disconnect the negative terminal first before replace the >batteries is clear in the service manual, but I don't know if only this is >sufficient.
I don't know of anything explicit in any standard, but the consequences of shorting a 48 V battery could be very serious, up to loss-of-life. Therefore I would think in terms of the General Safety Directive, which says, in effect, 'make it safe, then make it safer'. So: - put a warning notice **next to the battery** saying 'Disconnect THIS terminal first.' Don't rely on a drunken blind, idiot knowing which is the negative one. - if possible, fix to the negative connector a plastic shield that covers up the positive terminal and connector, so you can't even get at the positive terminal without first removing the negative one. If you need to be able to measure the battery voltage with a multimeter, put a small hole in the shield that will just admit a test-prod. You could perhaps put the warning notice on the shield itself. -- Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Foxhunters suffer from tallyhosis. PLEASE do not mail copies of newsgroup posts to me. ------------------------------------------- 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: Michael Garretson: pstc_ad...@garretson.org 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://www.rcic.com/ click on "Virtual Conference Hall,"
