As for IPC spacing, see IPC-2221 table 6-1 which is vastly different than UL spacing's. My regards, Steve Smith Project Engineer Staco Energy Products Co. "Your tailored power solutions provider" -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Toby Carrier Sent: Wednesday, July 08, 2009 3:20 PM To: [log in to unmask] Subject: [TN] IPC High Voltage PCB Marking and Spacing Hi All, Does anyone know of an IPC standard that states a requirement of high voltage spacing and marking? I know that UL requires spacing based on the voltage, but not for sure about IPC. Thanks for the help. Toby Engineering Technician --------------------------------------------------- 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.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------