there is some consideration of this hazard in the EN-60601-1-1 Standard for Safety of Medical Electrical Systems Ged Dean
From: John Woodgate [mailto:[email protected]] Sent: 29 June 2003 09:51 To: [email protected] Subject: Re: Czech medical grounding? I read in !emc-pstc that Jon Griver <[email protected]> wrote (in <3EFEAC1E.19777.64DE86@localhost>) about 'Czech medical grounding?' on Sun, 29 Jun 2003: >Theoretically, it could also be necessary for battery powered equipment >connected via a >communication line to equipment in another room. If the patient were to >accidently touch the metal >enclosure, a current loop could be closed, if the connection caused the >enclosure to be earthed at >a potential different from that of other equipment to which the patient may be >connected. This is more than 'theoretical'. The hazard presented by introducing a 'remote earth/ground' into an area is not documented in any standards or guides, AFAIK, and is thus not widely recognized. -- 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] 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 ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. NCHT ********************************************************************** 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] 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
