David, If the standards are harmonized, then I do not see any reason for UL requiring higher spacings for 120 V than the European standards for 230 V.
If the standards are not harmonized, yes, there are situations when the clearances or creepages for US standards for 120 V can be more than the EN standards for 230 V. The reason is that US/Canadian standards were developed wihout taking into consideration the international IEC664 standards. Today, many Canadian/US standards are taking IEC 664 seriously. This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. If you received this e-mail message in error, please return by forwarding the message and its attachments to the sender. PETER S. MERGUERIAN Technical Director I.T.L. (Product Testing) Ltd. 26 Hacharoshet St., POB 211 Or Yehuda 60251, Israel Tel: + 972-(0)3-5339022 Fax: + 972-(0)3-5339019 Mobile: + 972-(0)54-838175 http://www.itl.co.il http://www.i-spec.com -----Original Message----- From: David Sproul [mailto:[email protected]] Sent: Tuesday, October 08, 2002 5:51 PM To: [email protected] Cc: EMC-PSTC Subject: RE: Creepage Can anyone give a rational reason why UL ask for around twice the creepage distances for 120V that EN standards ask for 230V. I realise this is a bit vague, but I can dig out some examples if any needs to be convinced. I have been asked this by customers on a number of occasions, and have always meant to find out so I would no longer have to apologise for not knowing. Thanks Richard for jogging my memory. Best regards, David Sproul. -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of [email protected] Sent: 07 October 2002 19:46 To: [email protected] Subject: Creepage What is a good source that explains the rational for the values for creepage distances? Richard Woods Sensormatic Electronics Tyco International ------------------------------------------- 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" ------------------------------------------- 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"
