Anil, Remember, some of those tests you mention assume a "Primary Protector" is also in place. In the U.S. maybe you can assume this is true, but can you worldwide?
Also, for some of those tests, the criteria for failing are fragmentation/fire, obviously the product would not continue to work then - but you may still hold a passing test report. In short, meeting those requirements assures a very limited degree of safety presented to the user and quality of the product, not a thoroughly robust lightning proof design. Best regards, Stephen At 12:37 PM 8/5/2003, Anil Allamaneni wrote: Greetings folks, We have products that meet all the Surge requirements of NEBS GR-1089, FCC-68 and EMC 4-5. But, the same products are continuously failing in the field due to real-world lightning strikes. I have spoken to four other manufacturers who make similiar interfaces (DSL) and they all have the same problem : they meet the standards, but fail in the real world. I have two questions for the esteemed people here : 1) Were these standards written based on somebody doing some field evaluations? Has IEEE/Bellcore done any research into what the waveforms really are for actual *real-world* lightning strikes? How do they do that? 2) Is somebody working on re-charaterization of lightning strikes throughout US (eg, the surges seem to be more lethal in TN as opposed to CA)? Would you have the contact details of Working Groups? Thanks [email protected] __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com <http://sitebuilder.yahoo.com/>
