In message <009301c74f67$29ea1160$6401a8c0@christopher>, dated Tue, 13 Feb 2007, Chris Wells <[email protected]> writes
>I am looking for help rationalizing when a product must be evaluated to >the LVD. >This is for a product my company is considering namebranding. >I would like to see the product evaluated to EN60950 but the vendor is >arguing that due to the 24VDC, low voltage rating the product does not >need to be formally evaluated to an European safety standard to claim >the CE mark. The product does meet UL508. The vendor is correct, in terms of 'formally'. But we advise applying EN 60950 anyway, just in case some weird fault occurs with significant consequences. This is especially important if the product contains any sort of battery. Very high short-circuit currents can occur. > >Background - The product is a communication gateway with the >following ports: >*DC power in put 24VDC ~ 10W (not internally fused) >*Ethernet, Cat5 RJ45 twisted pair LAN/WAN interface >*RS485 multipoint subnetwork (Modbus, cable up to ~ 4K') >*Proprietary twisted pair multipoint network similar to RS485 (cable up >to 10K') >*RS232 port for connecting to external modem like devices >*USB slave - temporary programming port >*Modem Interface - optional (not found on all models) >In my view the Modem interface is very hazardous and so the product >should be formally evaluated. In what way is it hazardous? >Since the modem interface is a USA version perhaps this model could be >excluded from having a CE mark. >Anything else stand out as requiring evaluation to EN60950? > >Also I remember reading that this voltage limit exception topic is >under review. That has not been progressed. The new 'consolidated' version of the LVD still has the lower limits. But if the product has a modem interface, does the RTTE Directive apply? That doesn't have a lower voltage limit. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
