Perhaps the connector contains both mains and secondary circuits and does NOT provide reinforced insulation between those circuits - or maybe not. In any case the problem surrounding the connector can best be answered by the engineer at UL who determined the connector is the reason the output could be considered only ELV.
Lou Aiken 27109 Palmetto Drive Orange Beach, AL 36561 U.S.A. tel 1-334-981-6786 fax 1-334-981-3054 mobile 1-334-979-4648 ----- Original Message ----- From: Dave Wilson <[email protected]> To: <[email protected]> Sent: Wednesday, April 18, 2001 5:21 PM Subject: SELV vs ELV > > We've been looking at a PSU which has UL recognition. Our -48V DC CO > equipment has been assessed with respect to being powered from SELV source > and this is stated in our UL report, but now that I've received a copy of > the UL report for the PSU, it states that the output is ELV, not SELV, > because of the connector interfacing the modules to the rack. > > The obvious answer is that we can't use it, but what is the practical > reason for not being able to use ELV, given that they're both limited to > below 60V DC and that our equipment is Class I earthed. > > Thanks! > > Dave Wilson > Alidian Networks Inc. > tel: (408) 273 4787 > fax: (408) 273 4800 > > www.alidian.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: > Michael Garretson: [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://www.rcic.com/ click on "Virtual Conference Hall," > ------------------------------------------- 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: Michael Garretson: [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://www.rcic.com/ click on "Virtual Conference Hall,"
