IMHO It is irrelevant whether you violated any guideline or not. Do not ever mount any conductive entity over a trace which then relies solely on the SM for electrical protection. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Abel, Shannon K. Sent: Thursday, September 21, 2006 7:44 AM To: [log in to unmask] Subject: [TN] Mechanical Hardware Clearance... I have a board with a 15VDC trace on the surface layer that runs under a flat washer. The trace is covered by SM, which provides 500vdc isolation per .001 mil of SM coating. 2221 states that any electrical conduction trace per sec 6.3 lists a minimum clearance of .00512 to any other conductive surface (.ie mechanical hardware) Do I violate the spec. Any help would be greatly appreciated. Shannon Abel --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------