Jim I your case the required BASIC INSULATION is not present or adequate. BASIC INSULATION provides a level of protection. The branch circuit provides an additional level of protection if there is a failure of the BASIC INSULATION. The standard in this instance allows the designer to provide an alternate protection method to replace the BASIC INSULATION, with the requirement that it fails safe and it does not impact any other insulation system. Regards, Kurt Mikolajewski
From: Jim Eichner [mailto:[email protected]] Sent: Tuesday, January 28, 2003 5:13 PM To: [email protected] Subject: RE: Circuit Breaker Tripping Dring Fault Tests I've been trying to solve this one myself. I work with one pair of standards (UL458 / CSA107.1) where they specifically say that opening the branch circuit protection is acceptable during component fault testing, but NOT during short circuit tests done for the purposes of validating inadequate trace spacings (an easement offered in the standards in some situations). I've always been puzzled why we can't rely on branch circuit protection for both situations, but neither agency has been able to explain the difference to me. Jim Eichner, P.Eng. Regulatory Compliance Manager Xantrex Technology Inc. phone: (604) 422-2546 fax: (604) 420-1591 e-mail: [email protected] web: www.xantrex.com Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. _____ Do you Yahoo!? Yahoo! <http://rd.yahoo.com/mail/mailsig/*http://mailplus.yahoo.com> Mail Plus - Powerful. Affordable. Sign up < ttp://rd.yahoo.com/mail/mailsig/*http://mailplus.yahoo.com> now
