Hi Peter:
Clearance and creepage distances are manifestations of either Basic or Supplementary insulation used for protection against electric shock. Since the supply is no more than 7.4 V dc, and since there are no measuring terminals, your product does not have any source that would comprise an electric shock source, i.e., no "hazardous live" parts. See 6.1, 6.3.1, and 6.4. Consequently, the requirements for Basic and Supplementary insulation do not apply. Therefore, your product is exempt from clearance and creepage distance requirements. This is a confusing point in many safety standards. Clearances and creepage distances comprise Basic, Supplementary, or Reinforced insulation between "hazardous live" parts and accessible parts, yet they are treated as clearances and creepages, not as insulation. Best regards, Rich > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Peter Weichel > Sent: Sunday, August 27, 2006 11:51 PM > To: PSTC Newsgroup > Subject: Clearance / creepage question > > > Dear experts, > > Can someone here please help me spread som light over a > clearance/creepage question for me ? > > I have a handheld portable measuring product covered by IEC > 61010-1 driven only by lithium battery power source of 3.7 - > 7.4V. From the standard i can get several tables listing > requirements but i have some trouble deciding exact table to use. > > The product is pollution degree 2, having no specific data > for material group i suppose III is the one to choose. > Measuring system is not electrical so > there are no external measuring cables. > > Best regards > PBI-Dansensor > > Peter Weichel > Test and Approval Engineer > > PBI-Dansensor A/S > Roennedevej 18 > DK-4100 Ringsted > Tel.: (+45) 57 66 00 88 > Fax: (+45) 57 66 00 99 > e-mail: [email protected] > Website: www.pbi-dansensor.com > > > CONFIDENTIALITY. This email and any attachments are > confidential and may also be privileged. If you are not the > named recipient, please notify the sender immediately and do > not disclose the contents to another person, use it for any > purpose or store or copy the information in any medium. > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. Website: http://www.ieee-pses.org/ > > To post a message to the list, send your e-mail to [email protected] > > Instructions: http://listserv.ieee.org/request/user-guide.html > > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > > Scott Douglas [email protected] > Mike Cantwell [email protected] > > For policy questions, send mail to: > > Jim Bacher: [email protected] > David Heald: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieeecommunities.org/emc-pstc > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.405 / Virus Database: 268.11.6/430 - Release > Date: 8/28/2006 > > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
