I can imagine that it is a perfectly reasonable requirement that electricity meters be required to operate correctly when subjected to high magnetic fields, to overcome any likely fraud attempts by enterprising consumers with permanent magnets, trying to reduce their electricity bills. I suspect that is the reason for the requirement in IEC 60521.
Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Discovery Centre, 3 Fulton Road, Dundee, Scotland, DD2 4SW E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. -----Original Message----- From: plaw...@west.net [mailto:plaw...@west.net] Sent: 02 May 2002 16:24 To: EMC-PSTC Subject: Re: IEC 60601-2-24 / Magnetic Field Are you sure about the IEC 60521 reference? IEC 60521 (1988-03) Class 0.5, 1 and 2 alternating-current watthour meters Applies only to newly manufactured induction type watt-hour meters of accuracy classes 0.5, 1 and 2, for the measurement of alternating current electrical active energy of a frequency in the range 45 Hz to 65 Hz and to their type tests only. This publication supersedes IEC 60043 (1960), 60170 (1964) and 60280 (1968). ---- Patrick Lawler plaw...@west.net On Mon, 29 Apr 2002 10:55:57 -0400, Ned Devine <ndev...@entela.com> wrote: >I can help much, but, for this paragraph, the rationale at the back of the >standard states that "Annex AAA of the Collateral Standard IEC 60601-1-2 >states that the limits and methodology are under consideration by technical >committee 77. This Particular Standard, however, refers for the time being >to IEC 60521 in which 400 A/m is required." > >For the Second Edition of IEC 60601-1-2, Clause 36.202.8.1, the limit is 3 >A/m. > >Ned Devine >Program Manager >Entela, Inc. >3033 Madison Ave. SE >Grand Rapids, MI 49548 >1 616 248 9671 Phone >1 616 574 9752 Fax >ndev...@entela.com e-mail > >Entela, Inc. A Certified Woman Owned Business >www.entela.com > >-----Original Message----- >From: am...@westin-emission.no [mailto:am...@westin-emission.no] >Sent: Sunday, April 28, 2002 3:40 PM >To: emc-p...@majordomo.ieee.org >Subject: IEC 60601-2-24 / Magnetic Field > >Hi all, >A colleague was checking the IEC 60601-2-24:98 and found the Magnetic Field >Req't (paragraph 36.202.6) far too high: 400 Ampere-per-meter! I'd like to >check this requirement for its correctness or history with backgrounds for >such a demand. I know that 3A/m, 10A/m and 30A/m are often used, but 400A/m >..... > >Can anybody help? > >Best regards >Amund Westin, Oslo/Norway > >PS: IEC 60601-2-24:98 - "Medical electrical equipment - Part 2-24: >Particular requirements for the safety of infusion pumps and controllers" ------------------------------------------- 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: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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"
