I read in !emc-pstc that Michael Taylor <[email protected]> wrote (in <[email protected]>) about 'question on measuring bonding impedance', on Mon, 15 Apr 2002: > for domestic product safety EN-61010 Sect 6.5.1 requires 25Amps (DC or > ACrms) or 2x the fuse rating. I have never liked this method of testing.
Well, EN61010 is certainly not for domestic products, that's EN60335-1, but most of the standards call up a similar test. For safety purposes, it's appropriate, because the test is intended to find out if the protective device will operate in the event of an overcurrent fault. The voltage source driving the earth fault current may, in Europe, be as high as 50 V, but there may be some voltage drop in the fault circuit, so that the joint sees no more that a few volts, hence the limited source voltage for the test, usually 12 V. A 'dry circuit' test may be appropriate for some purposes, but for safety purposes, the existing test is apt. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
