From: [email protected] [mailto:[email protected]] On Behalf Of Derek Walton Sent: Wednesday, March 19, 2008 7:50 AM To: IEEE EMC Discussion Group Subject: DO-160 Hi all, I'm testing a relay used for switching power on an Aircraft. I'm trying to get consensus on the classification of power leads Vs interconnect leads. This device is switching power, so are these leads power leads or interconnect? Power for the relay circuits comes in separately. One can argue the Switched power source wires are Power leads since they connect to the AC power bus. The output switched wires could be considered interconnect since they supply loads. However, since they are also a power source for other circuits they could be considered power too. Thoughts? Thanks, Derek Walton L F Research Derek: If the loads are part of the relay equipment, then the relay power output leads might be considered "internal" or interconnecting lines, and need not meet the DO-160. But much more likely, the loads are just some other electronics boxes on the aircraft. Since those boxes are going to be DO-160 compliant, then your relay output power must also be DO-160 compliant. You shouldn't put any more noise onto a power bus output than you would onto a power bus supplying your equipment. The power circuit to operate the relay would be considered an interconnecting lead. Ed Price <mailto:[email protected]> [email protected] WB6WSN NARTE Certified EMC Engineer & Technician Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (FAX) Military & Avionics EMC Is Our Specialty - ---------------------------------------------------------------- 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
