Simply request data supporting the reasoning behind the requirement. Before doing so, collect your own data supporting your reason for breaking the rule. I find it strange that the engineer is willing to put it out there that you have to follow this rule that he cannot confirm the reason for and this is done just because we have been doing it this way for xyz years. Maybe you have been doing it wrong for the last xyz years? At some point there will be a design that will require breaking that rule and a compromise will need to be made. It is best to find a way to work this through or find out why this is a blanket rule, then to wait until the time comes you don't have a choice but stand your ground. Ted T. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Cote, Clint (GE Intelligent Platforms, US) Sent: Tuesday, January 11, 2011 12:21 PM To: [log in to unmask] Subject: Re: [TN] Trace Widths Entering SMT Yes, standard FR4 multi-layer with soldermask. I asked the Engineer and he isn't sure because the requirement pre-dates him. But, he is adamant that the requirement must be met. ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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.aspx?Pageid=E-mail-Forums for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------