Hi Judd:
> We are currently designing an ac filter assembly. The board is extremely > small and we need to put text in etch (copper) on board. About the only > place is an area that provides basic insulation from ground. Essentially, the text in copper shorts out some of the basic insulation. Therefore, when measuring the creepage distance, you measure from one conductor to the nearest edge of the text, and then from the opposite edge of the text to the opposite conductor. If the sum of the two creepages equal or exceed the specified creepage, the text is okay. If not, then the design doesn't meet the creepage requirement. See IEC 950 or clone, Annex F, Figure F.15. The etched text is the "intervening, unconnected conductive part." You might consider negative text in one of the larger conductors or in the ground conductor. Best regards from San Diego (North County Inland), Rich ------------------------------------------------------------- Richard Nute Quality Department Hewlett-Packard Company Product Regulations Group San Diego Division (SDD) Tel : 619 655 3329 16399 West Bernardo Drive FAX : 619 655 4979 San Diego, California 92127 e-mail: [email protected] -------------------------------------------------------------
