Scott, The distance from a copper conductor to a board edge is covered in IPC-2222 para 10.1.1 Edge spacing. Simply, it is 0.4mm [0.016in] plus your minimum electrical spacing. If you are still using the old IPC-D-275, you will find it in para 5.3.1.4 Edge spacing. Regards, Gary Ferrari Executive Director IPC Designers Council (860) 350-9300 Fax (860) 350-9309 [log in to unmask] >>> SABowles <[log in to unmask]> 04/20/98 02:40PM >>> To all Technetters, Does anyone know if it is written in any IPC or UL specification the minimum distance you must have a copper trace or plane layer away from the board edge? Thanks, Scott ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################