From: "bob" <[email protected]> Subject: Re: Trace Spacings for PSTN Interfaces ...
I agree with Vic, I would like to point out you may already know that though, ITE has to comply with creepage and clearances as stipulated in UL-1950 for USA and CSA-950. However, those equipment/devices which has TNV circuits has to comply with the UL-1459 in US and corresponding standard for Canada. And for European countries it is covered in EN60950. There was a news about UL being working on a unified standard which shall be applicable to NAFTA, actually it was merger of two standards UL-1950 and UL-1459 for USA. Could somebody supply more information on this topic? In addition, there are some subclauses in UL standards, discussed above which allow deviations until year 2000, and after that one must adhere to tables given in these standards. Does this mean devices built now but in service after 2000 has to meet the requirements without deviations as of today? Your input shall be appreciated, Somm may not get this mail due to the block placed by their bosses on access to this treggers forum!!!!! http://www.microvolt.com/ Information is the key to success. -----Original Message----- From: Victor L. Boersma <[email protected]> To: INTERNET:[email protected] <[email protected]> List-Post: [email protected] Date: Monday, January 26, 1998 5:20 PM Subject: Trace Spacings for PSTN Interfaces ... > In other words, we aren't using the creepage/clearance > tables of say UL-1950 3rd Ed. to determine the distances, > or are we? The cost of doing independent creepage and clearance research is prohibitive. At one time Bellcore may have done some, but I believe that they have now accepted IEC 60950. I believe the same to be true for most service providers in Europe and North America, hence, sticking with UL-1950 should see you through. Vic
