I know this has been discussed at length in the past, but I can not find an answer to this question in the archives. I am hoping one of you ( or maybe even Jack) can answer this. J-STD-001 talks at length about not violating minimum electrical clearance. I know that IPC-2221A has requirements for both the PWB and the assembly with regards to minimum electrical clearance. However, how does one make the connection between the two? There is no direct reference that I can find that pushes you to 2221 to look for this information. Also, and this is for Jack or those that were involved with creating these specs, why are the assembly requirements located in the PWB design spec? Bruce Stilmack GDLS-TO Manufacturing Engineer (850) 574-4773 [log in to unmask] --------------------------------------------------- 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 -----------------------------------------------------