Fire enclosure does not necessarily have to be the outside shell.
It could be contained in an inner V-1 rated box. Or the product may
have been tested to single faults and passed. The outside shell could
then be rated at a lower flammability. As the people in the thread
have said, I wouldn't advise it though.
Eric Petitpierre
Pulsecom
Herndon, VA
[email protected]
______________________________ Reply Separator _________________________________
Subject: RE: Open Letter re ITE Flammability (Source is NAFM)
Author: [email protected] (Andrews; Kurt) at smtp
List-Post: [email protected]
Date: 1/20/00 3:12 PM
According to 4.4.4 of both UL 1950 and EN 60950 monitors should be at least
V-1. 4.4.4 says that fire enclosures of less than 18 kg (about 40 lb.) have
to be at least V-1. For fire enclosures over 18 kg it needs to be 5V. So if
a monitor has a UL mark it should be at least V-1. A monitor case should
definitely be a fire enclosure as 4.4.5.1 says the following items need a
fire enclosure and I'm sure that all monitors have at least some of these:
components having unenclosed arcing parts, such as open switch and relay
contacts, and commutators; components having windings, such as transformers,
solenoids and relays; wiring; semiconductor devices, such as transistors,
diodes and integrated circuits; resistors, capacitors and inductors.
Kurt Andrews
Compliance Engineer
Tracewell Systems, Inc.
567 Enterprise Dr.
Westerville, OH 43081
Ph. 614-846-6175
Fax 614-846-7791
Email: [email protected]
-----Original Message-----
From: Colgan, Chris [SMTP:[email protected]]
Sent: Thursday, January 20, 2000 12:40 PM
To: [email protected]
Subject: RE: Open Letter re ITE Flammability (Source is NAFM)
Interesting and worrying. Does EN60950 call up flammability
requirements
for polymeric enclosures? If not, I guess I had better look for a
PC with a
NRTL mark as well as a CE mark - and then check it is V-0 rated.
You may be amazed to know that while UL6500 (safety of audio visual
products) calls up flammability requirements for all product
enclosures, the
current edition EN60065 only requires the back and ventilated parts
of
television receiver enclosures to made of "slow burning material or
better a
fire retardant material". There is no requirement for other
products such
as amplifiers, CD players etc. The next edition of EN60065
addresses the
problems of enclosure flammability but there must an awful lot of
highly
flammable hi-fi equipment out there. Think twice before placing
that
yuletide candle on top of your hi-fi stack.
Regards
Chris Colgan
EMC & Safety
TAG McLaren Audio Ltd
mailto:[email protected]
> -----Original Message-----
> From: Art Michael [SMTP:[email protected]]
> Sent: 20 January 2000 14:48
> To: [email protected]
> Subject: Open Letter re ITE Flammability (Source is NAFM)
>
>
> Hello all,
>
> Recently my attention was drawn to an open letter from the
National
> Association of Fire Marshals, detailing their concerns with 94-HB
> enclosures, which - according to tests they initiated - can be
readily
> ignited by external sources.
>
> A quote from their letter: "In November and December of 1999, SP
(the
> Swedish National Research and Testing Institute) tested five
computer
> monitors - all of which had been or are available to consumers.
Three of
> the five were made with fire-resistant plastic housings. Repeated
> attempts to ignite these monitors failed. Two of the five monitors
were
> made with HB rated plastic housings. A SINGLE MATCH IGNITED EACH
OF THESE
> QUICKLY."
>
> [The emphasis in the last sentence is mine]
>
> The NAFM letter can be viewed at:
<www.firemarshals.org/openletter.html>
>
> My interests were piqued and the subject-matter served as the
basis for an
> article in the current issue of Int'l Product Safety News. To
further
> this discussion, I ask you to read the open letter and then ask
yourself;
>
> A) What is your company's business practice ? Do they, 1: Just
meet the
> requirements (per a given standard) ? or, 2: Strive to provide
> equipment that is "safe" beyond the requirements of the standards
?
>
> B) Should ITE (and other) product safety standards be concerned
with
> external sources of ignition.
>
> C) Do you agree that ITE should be singled out for scrutiny, given
that
> children's bedrooms (the impetus behind this open-letter), and in
fact,
> whole households, are replete with easily ignited materials.
>
> Regards, Art Michael
>
> Int'l Product Safety News
> A.E. Michael, Editor
> 166 Congdon St. East
> P.O. Box 1561
> Middletown CT 06457 U.S.A.
>
> Phone : (860) 344-1651
> Fax : (860) 346-9066
> Email : [email protected]
> Website: http://www.safetylink.com
> ISSN : 1040-7529
>
>
>
>
> ---------
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=====================================================
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