Xing Hello! Take a look at IEC 60990, "Methods of measurement of touch current and protective conductor current". The limits in IEC 60 950 are based on this particular standard. Best Regards
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.itl.co.il/> http://www.i-spec.com <http://www.i-spec.com/> -----Original Message----- From: xingwb [mailto:[email protected]] Sent: Monday, June 24, 2002 1:57 AM To: [email protected] Cc: Rich Nute Subject: TOUCH CURRENT LIMIT Dear colleagues I have a question regarding touch current limit of IEC 60950? We can read from table 5A of IEC60950:1999: Touch current limit for accessible parts and circuits not connected to protective earth: 0.25 mA question 1 : How does it (0.25mA) come from and what it is based on? based on IEC479? OR other source why it is not 0.5mA(based on IEC60479) question 2 :for hand-held equipment it is 0.75mA why ? Please shed some light for above questions Any comments are appreciated Best Regards Xing weibing 2002-06-24
