Mike, I remember the same HB requirement by an NRTL. Although most of the
internal parts I dealt with were typically V1 or better.
If you get bored someday, take a match to an HB material part and watch
what happens. I did that once (outside) and it turned into what looked like
a pool of wax, with what was an invisible flame. Once it turned into a pool
of plastic, we extinguished the flame. As a result of that test in my mind,
HB means slow burn.
Jim Bacher, WB8VSU
ja.bac...@outlook.com
JBRC Consulting LLC
Product EMC & Regulatory Consultant
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IEEE Life Senior Member
On November 23, 2024 1:56:36 PM MIKE SHERMAN
<0000347e8d192c85-dmarc-requ...@listserv.ieee.org> wrote:
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 <jral...@productsafetyinc.com> 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??
Best Regards and Be Safe,
John
John Allen | President & CEO | Product Safety Consulting, Inc.
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