This is an an interesting sort of problem with a number of factors. (A former manager used to turn gray when I called something "interesting.") One might see a very slow longitudinal DC motion as charges pass over elevated lines, sometimes enough to fire protectors. DSL equipment uses, and is open to, spectrum presented by a discharge. And when protectors fire, imbalance in their forward voltages or turn-on times can generate a metallic component DSL transformers pass with little reduction. Overstress damage is often cumulative and latent until final failure, and there ARE places with more lightning than others. Florida comes to mind, and Texas.
And do we test protectors for SLOW rise times, or only to se if they're FAST enough? Cortland This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
