KBJ & PSNet,
As you probably know the requirements for flammability of PWBs come
down thru the chain of UL 94, UL 746 and UL 796. There are IEC equivalents
for these requirements, but I don't have all the standard numbers at hand.
To show conformity to requirements markings on the board are
needed/required. Traceability is easily done once the manufacturer's mark
and type number are shown since all the PWB characteristics are listed in
the UL Component database under this mfgr & type.
The inclusion of the UL V-X rating is superfluous once the mfgr &
type are identified. I never look for the V rating on the board; I'm
examining the UL database info for proper ratings. There are other
parameters which are of interest in meeting the needed requirements for the
product standard which are given there.
So, your reference to 'E4' may be the manufacturers' type number
>from which you can determine the V-rating.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
From: [email protected] [mailto:[email protected]] On Behalf Of Kim Boll
Jensen
Sent: Friday, November 07, 2008 6:14 AM
To: EMC PSTC
Subject: UL flammability marking
Hi all
I have been told that the UL marking on PCB (UR 94V-0 etc.) can also be
something like E4. Does anyone know if the marking requirements have been
changed and if so where I can get more information.
Best regards,
Mr. Kim Boll Jensen
Bolls Rådgivning
Ved Gadekæret 11F
DK-3660 Stenløse
Denmark
T: +45 48 18 35 66
F: +45 48 18 35 30
[email protected]
www.bolls.dk
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