An external fire is outside of the scope or the standard. The title of the clause is protection from the spread of fire. The intent of the clause is for the device to not be the source of the fire and to contain any fire which may start internally.
Regards Tom Smith, P.Eng Principal Engineer TJS Technical Services Inc. Tel: +1 403-612-6664 Email: [email protected] <mailto:[email protected]> http://tjstechnical.com <http://tjstechnical.com/> Compliance News Updates: https://corp.social/@TJS_Technical From: MIKE SHERMAN <[email protected]> Sent: November 23, 2024 11:56 AM To: [email protected] Subject: Re: [PSES] Calling all UL 61010 experts John -- My recollection from working with one NRTL was that they wanted all nonenclosure polymerics on equipment to be HB minimum, even though I could not find this requirement in the related standard. Stated reason, as I recall, was to not provide any additional fuel for a fire, even an external fire. I also had a similar experience as Jim Bacher reports, where different shrinkage rates meant a new injection mold if changing from an HB to a V-rated material. Mike Sherman Sherman PSC LLC On 11/22/2024 8:35 AM CST John Allen <[email protected] <mailto:[email protected]> > wrote: Hello everyone, I’m trying to determine if a flame rating is required for polymeric materials in a Limited Energy circuit. Per Clause 9 - 1 – Test to prove no ignition can occur (9.1). If ignition occurs, see item 3 below. 2 – Eliminate or reduce the source (9.2) 3 – Contain the fire with appropriate materials (9.3). * Metal * Polymeric V-1 minimum per 9.3.2c)2. I find it interesting when searching for “propagate” it only refers to insulated wire and cables shall retard propagation (9.3.2b)). I believe propagation of flame should also be a requirement of polymeric materials near ignition sources. All that said, although we can argue items 1 and 2 above do not need a flame rated enclosure, I feel 94HB should be the minimum and guessing a NRTL/Certification Body would feel the same. Thoughts?? 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