Hello all, Didn't get many responses to this but I want to pass some information on regarding why 25 Amps was selected as the default test current. Apparently this is a legacy value from the UK when 12 amp circuit breakers were being used as mains breakers. A guess that 2 x 12 rounds up nicely to 25. However, it is my understanding that 12 amp mains breakers are no longer used in the UK. Can someone please verify this?
Regards, +=================================================================+ |Ronald R. Wellman |Voice : 408-345-8229 | |Agilent Technologies |FAX : 408-553-2412 | |5301 Stevens Creek Blvd., |E-Mail: [email protected]| |Mailstop 54L-BB |WWW : http://www.agilent.com | |Santa Clara, California 95052 USA| | +=================================================================+ -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Wednesday, July 24, 2002 1:58 PM To: [email protected] Subject: Bonding Impedance Hello all, I recent issue has come up for me regarding why some safety standards specify 100 milliohms as the acceptable impedance for a protective earth ground bonding test. I am curious as to what the rationale is for this specific value and why 25 amps is chosen as the default test current. Regards, +=================================================================+ |Ronald R. Wellman |Voice : 408-345-8229 | |Agilent Technologies |FAX : 408-553-2412 | |5301 Stevens Creek Blvd., |E-Mail: [email protected]| |Mailstop 54L-BB |WWW : http://www.agilent.com | |Santa Clara, California 95052 USA| | +=================================================================+ ------------------------------------------- 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" ------------------------------------------- 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"
