Hello Mel, We were wondering, because, IEC 112 says, that the CTI for materials with a thickness less than 3mm will be difficult to compare. ( I believe, that's the reason why UL mentioned only plastics with thickness > 3mm in the yellow book). However, the testing with a high current source over a material may not be necessarily the usually use in the end equipment, and therefore it applies for testing only (the thickness of > 3mm). Anyway, did you attach a file to your message (ATT1.unk)? I can´t read. Best rergards Heiko Kuhling Compliance Engineer TUV Rheinland Japan, Yokohama Laboratory tel.: +81(0)45-592-1371 fax: +81(0)45-592-1374 e-mail: [email protected] (Embedded image moved mpedersen @ midcom.anza.com to file: 05.06.97 04:34 PIC23020.PCX) Please respond to [email protected] To: treg @ world.std.com cc: (bcc: Heiko Kuehling/Jpn/TUV) Subject: RE: Tracking Index (CTI)
Hello Heiko: To my knowledge, this should not be a problem. Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 [email protected] Fax: (605) 886-6752 ---------- From: Heiko K|hling[SMTP:[email protected]] Sent: Tuesday, June 03, 1997 3:16 PM To: [email protected] Subject: Tracking Index (CTI) Hello Treckers, I have a question regarding the tracking index. The tracking index will be "measured" according to IEC 112. The test condition for applied probes is given with a minimum thickness of 3mm . (If the sample has a thickness less than 3mm, they shall be stapled up to 3mm in order to garantee the comparebility of testresults). I checked the yellow book from UL and usually plastic materials under 3mm are not tested for CTI. Can we apply a higher CTI - value in order to reduce creepage distances for materials with a thickness less than 3mm? Heiko K|hling e-mail: [email protected] RCIC - http://www.rcic.com Regulatory Compliance Information Center
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