If an opening fully complies with 4.6.1 or 4.6.2 then it doesn't need to be filled with anything, and there's no reason for a V-1 requirement.
I believe the '950 authors meant to address openings that would not comply with 4.6.1 or 4.6.2 if the component involved was not installed in the hole. Since they say "components" and have the note "NOTE Examples of these components are fuseholders, switches, pilot lights, connectors and appliance inlets", I guess they figured that they didn't need to put any size limits in. However what if the component in question is a 4" diameter panel-mounted instrument? Or a blanking plate covering an unused 2" knockout. Or... Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. phone: (604) 422-2546 mobile: (604) 418-8472 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. From: Bolintineanu, Constantin [mailto:[email protected]] Sent: Thursday, January 08, 2009 6:01 AM To: Jim Eichner Subject: RE: IEC 60950-1 section 4.7.3.2 regarding openings in fire enclosures Hi Jim, Your question is a very USEFUL one, I did not know who may clarify it....?!? In my engineering judgement the decision shall be considered in conjunction with the Clause 4.6. Openings in enclosures; My personal interpretation was (and still is until somebody else will provide a rationale OR as you specified a CTL decision will be available - I did not find anything related to it-but it does not mean that there is nothing...), that they are talking about the OPENINGS that fully meet 4.6.1 and /or 4.6.2....ONLY; OTHER OPENINGS are (as per 4.6 not allowed EXCEPT if Method 2 of 4.7.1 is used and complies with it....) exempted and can not filled with anything worst than 5VB (e.g.: stationary equipment)... Respectfully yours, Constantin Constantin Bolintineanu P.Eng. TYCO SAFETY PRODUCTS CANADA 3301 LANGSTAFF Road, L4K 4L2 CONCORD, ONTARIO, CANADA e-mail: [email protected] Tel: 905 760 3000 ext 2568 Fax: 905 760 3020 Before printing this e-mail think if it is necessary DISCLAIMER: 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 the message and its attachments to the sender, and then please delete from your system without copying or forwarding it or call TSPC at 905 760 3000 extension 2568 so that the sender's address records can be corrected. From: [email protected] [mailto:[email protected]] On Behalf Of Jim Eichner Sent: Wednesday, January 07, 2009 3:08 PM To: [email protected] Subject: IEC 60950-1 section 4.7.3.2 regarding openings in fire enclosures IEC 60950-1 section 4.7.3.2 contains the following paragraph: Materials for components that fill an opening in a FIRE ENCLOSURE, and that are intended to be mounted in this opening shall: − be of V-1 CLASS MATERIAL; or − pass the tests of Clause A.2; or − comply with the flammability requirements of the relevant IEC component standard. Seems ok to require most of the fire enclosure to be 5V with small sections of V1 allowed, but the above has no size restriction, which seems odd to me. Does anyone know if this is the subject of a CTL decision or any other “official†interpretation? I’ve seen UL and CSA standards with similar easements but there’s a dimensional cap (for example openings no more than 1†(25.4mm) in any dimension). Thanks, Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. e-mail: [email protected] web: www.xantrex.com Any opinions expressed are those of my invisible friend. 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. 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