We are users of many types of electro-medical equipment, all of which we subject to basic safety testing before placing into service in our hospital.
Our experience is that metal-to-metal is the only relaible means of chassis earth-bonding. We regularly find that equipment delivered to us which has relied upon star-washers or other types of fastening to cut through surface coatings to achieve reliable bonding fails to do so properly, leaving accessible parts at intermediate resistances to earth. (The use of rasping fasteners may produce satisfactory results on the individual device sent for type-testing, but it would appear to be difficult to consistently achieve the same result on the assembly-line) Ged Dean, Nottingham City Hospital, UK. ********************************************************************** 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: 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...@mediaone.net 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"
