Hi John:
I assume the power is distributed more-or-less evenly throughout the garment.
See:
https://learn.adafruit.com/experimenting-with-conductive-heater-fabric/what-is-it
(Be sure to click on the blue “placement” near the bottom of the page and the
subsequent pages.)
If this describes the way the garment heater works, then the quoted standards
don’t apply very well. I would need to know a bit more about how the heater
heats the garment to give you advice.
Best regards,
Rich
ps: Nice to see and talk with you at ISPCE!
From: John Allen <jral...@productsafetyinc.com>
Sent: Wednesday, October 5, 2022 8:18 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Wearables and UL 62368 vs UL 964 Electrically Heated Bedding
Hi,
I hope everyone is well and happy 😊.
I’m hoping I can get some input on my thinking for a heated garment powered by
a battery pack.
1. The heater is insulated.
2. The fabric it is in contact with is combustible.
3. The circuit is PS2 – 16W
4. I read UL 62368 Clause 6.4.5.2 as the fabric must not ignite under a
single fault and it must be UL 94VTM. Am I correct?
Also, in researching other “fabric” products, I found UL 964 Electrically
Heated Bedding. Following is a summary of how they manage fabric and heating
elements –
1. Sec. 6 Covering of Electrical Parts – All electrical parts shall be
covered (except the connector attached to the bedding) with a “shell” or other
fabric with no openings.
2. The heating element shall not be in direct contact with the shell. It
shall be insulated with UL AWM.
3. There shall not be any sharp edges in contact with the shell.
4. There is a very elaborate flammability test on the shell. Wash it in
special soap, let it dry then flame test it. It does not seem equivalent to UL
94 testing.
5. There’s also an “Ease of Ignition” test with a hot plate.
Is UL 62368 missing some requirements in regard to Wearables that are made of
fabric??
Wearable Technology Standards:
* Wellness or Non-Medical Wearable: IEC/UL 62368-1
https://www.ul.com/services/wearable-technology-testing-and-certification
I would appreciate any input you can provide.
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
<http://www.productsafetyinc.com/> www.productsafetyinc.com
John Allen | IEEE Product Safety Engineering Society
President 2016-2019, Past President 2020-2021, BoG Director at Large 2020-2023
Chairman – Compliance 101 Technical Committee
IEEE Senior Member
Keeping our members informed and educated on Product Safety and Certifications
<https://ewh.ieee.org/soc/pses/index.html>
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