An associate of mine is working on simulation training system that includes a motion platform and a mainframe computer graphics system. In order to meet conducted noise from the actuators in the motion platform, he has chosen to install isolation transformers on the single phase 120V line. The problem is that according to publications FIPS-94 and NEC article 250-30, (was article 250-26 in the 1996 code) a leg of the secondary must be grounded for safety. This is apparently required for all separately derived power systems. Now I understand that a PDU or PDS (transformer) as a separately derived power source is required to be grounded, but are we mixing apples and oranges here. In the instance of the simulator, this transformer does not provide power to anything but the simulator motion actuators themselves. 1. Would it not be reasonable for an ITE application such as this to maintain an isolated output for purposes of both noise and safety? I frequently find medical equipment with a requirement for isolated ac power. 2. If this is required is applicable is there a work-around on this? Thanks in advance…
Rick Busche - Product Safety Engineer ---------------------------------------------------------------- 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/listserv/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] 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.ieeecommunities.org/emc-pstc
