John, I am not a expert on that standard, however I have had to deal with
fires and enclosures. What I found out many years ago when that happened
was V0 materials were lower cost than HB material. I do not know if that is
true for all vendors or if it was just who we were using and the specific
material. I was told at the time V0 was a higher volume material and
therefore lower cost. Since then I always recommend V0 material for enclosures.
The other thing is what if standards change and require a higher grade
plastic to continue listing? That might require cutting new molds for the
parts. One product I was involved with the standard changed and started
requiring V0. The vendor called in a panic, I then pointed out we were
already using V0. That didn't help his other customers, but I didn't have a
panic.
Jim Bacher, WB8VSU
[email protected]
JBRC Consulting LLC
Product EMC & Regulatory Consultant
https://www.trc.guru/ email:[email protected]
IEEE Life Senior Member
On November 22, 2024 9:35:33 AM John Allen <[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??
Best Regards and Be Safe,
John
John Allen | President & CEO | Product Safety Consulting, Inc.
Your Outsourced Compliance Department®
630-238-0188, Cell: 630-330-3145
https://www.youtube.com/channel/UCVSzENmSoWeNFSBQcOYN7-A
www.productsafetyinc.com
IEEE Product Safety Engineering Society
President 2024-2025
Compliance 101 Technical Committee Chairman
IEEE Senior Member
Keeping our members informed and educated on Product Safety and Certifications
https://ewh.ieee.org/soc/pses/index.html
Although PSC maintains the highest level of virus protection, this e-mail
and any attachments should be scanned by your virus protection software.
It is the responsibility of the recipient to check that it is virus free.
PSC does not accept any responsibility for data loss or systems damage
arising in any way from its use. This message is confidential and intended
only for the individual to whom or entity to which it is addressed. If you
are not the intended recipient or addressee, or an employee or agent
responsible for delivering this message to the addressee, you are hereby
notified that any dissemination, distribution, or copying, in whole or
part, of this message is strictly prohibited. If you believe that you have
been sent this message in error, please do not read it. Please immediately
reply to sender that you have received this message in error. Then
permanently delete all copies of the message.
Thank you
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
[email protected]
All emc-pstc postings are archived and searchable on the web at:
https://www.mail-archive.com/[email protected]/
Website: https://ewh.ieee.org/soc/pses/
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to
unsubscribe)
List rules: https://ewh.ieee.org/soc/pses/listrules.html
For help, send mail to the list administrators:
Mike Sherman at: [email protected]
Rick Linford at: [email protected]
For policy questions, send mail to:
Jim Bacher at: [email protected]
To unsubscribe from the EMC-PSTC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
[email protected]
All emc-pstc postings are archived and searchable on the web at:
https://www.mail-archive.com/[email protected]/
Website: https://ewh.ieee.org/soc/pses/
Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to
unsubscribe)
List rules: https://ewh.ieee.org/soc/pses/listrules.html
For help, send mail to the list administrators:
Mike Sherman at: [email protected]
Rick Linford at: [email protected]
For policy questions, send mail to:
Jim Bacher: <[email protected]>
_________________________________________________
To unsubscribe from the EMC-PSTC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
