As to item 2 on the part 68 leakage test: It is a highpot type test. The idea is to see if hazardous currents from the AC power mains can reach the telco interface. The isolation is tested in two places: Once by placing 1000VAC between Tip/Ring and a long list of other parts of the product (which in most cases can be simplifed to logic ground). Second by placing 1500VAC between the AC mains inlet and a somewhat shorter list of parts of the product (also generally simplified to logic ground). In each case no more than 10mA of current can flow. The voltage is ramped to peak over 30 seconds and then maintained for another 60 seconds. Note that intentional paths to ground such as MOVs and spark gaps are removed for the test.
If you have more questions or desire greater detail please feel free to call. Jon D. Curtis, P.E. Director of Engineering email: [email protected] Curtis-Straus LLC phone: (508) 263-1897 409 Massachusetts Avenue fax: (508) 263-4164 Acton, MA 01720 http://world.std.com/~jdc/ USA On Wed, 24 Apr 1996, Larry Merchell wrote: > > 1. For Everyones Information, > > CFR's can be downloaded from (via Netscape): > > Federal Communication Commission > Office of Engineering and Technology > FCC Rules and Regulations > > located at: > http://www.fcc.gov/oet/info/rules/ > > 2. I am looking for information regarding 47 CFR 68.304 "Leakage current > limitations". The standard states that the leakage current must be less > that 10mA at 1500VAC from AC line to case [ (b) to (c) ], which looks like a > Hipot test not a leakage test. Does anyone have any additional information > regarding this? > > > Thank you for any help. > > Larry Merchell > Product Safety Engineer > Xentek Power Systems > > [email protected] >
