Christine, You state that "We modify and enhance the SW for high end performance" As part of this modification, have you left the NRTL Listing Mark on the device? My guess is that you have removed the NRTL Listing Mark which triggered the inspection by the local inspector. In some cities like the City of Los Angeles, local inspectors look for NRTL Listing Mark from accredited laboratories registered with the city. If your device was not evaluated by an NRTL registered in the city or to standard not in the scope of accreditation, that could also trigger an inspection. Another problem that may have triggered an inspection is that the NRTL Listing Mark specied "Home Use Only" when you are actually using the unit in a comemrcial application. Whatever the case, you will need to work with the inspector with or without the help of the a technical expert to solve your problem. Some inspectors allow you to bring an expert from a list of NRTLs they recognize for a field evaluation. This will involve a construction check and maybe some minimal testing to determine your device meets the applicable standard Best Regards, Peter Merguerian
--- On Wed, 5/13/09, Christine Rodham <[email protected]> wrote: From: Christine Rodham <[email protected]> Subject: Re:NRTL Mark vs. NEC Inspector To: [email protected] Date: Wednesday, May 13, 2009, 7:38 AM List Members, We have an interesting problem. We sold an OEM product ( very high end Home Theater Movie Projector , better than a movie theater quality) which was listed by a well known NRTL. ( We modify and enhance the SW for high end performance) The projector was installed in a public place and the installation was evaluated by a NEC ( National Electrical Code ) inspector. The projector has a metal ungrounded heat sink attached to the chassis that was added for cooling but was evaluated and approved by the NRTL. The NEC inspector will not sign off on the installation stating non-current carrying exposed metal parts that may be accidentally energized must be grounded to the chassis. Grounding the heat-sink to the chassis will be difficult due to the design of this special aluminum heat-sink. Here are my questions: * What is the criteria to determine if a metal part can become accidentally energized? The only way it could happen in this case is if the power cord that is near the heat-sink is damaged and then touches the heat-sink. The power cord is UL approved and properly rated. * How many fault conditions ( single vs multiple ) are considered to determine if a metal part can become accidentally energized. * What would be our best option in arguing this ruling. Should we request another inspector or get the NRTL involved? Note that this unit is ceiling mounted and only trained service people would have access to it after the initial installation. Thank you! Christine Rodham - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
