Please see the comments below from my associate who works closely with
UL and CSA.
George Alspaugh
Lexmark International
In reading the premise ...
UL intends to enforce the following
with effect on Jan 98 with a transition
of half to one year that ...
... by implication, UL 1950 has NOT been amended nor has UL proposed such.
Taken at face value, the statement ...
The minimal plastic requirement for SELV is going
to be 94V-1instead of HB as previously indicated.
... IS IN ERROR if intended to be a sweeping generalization. An ENCLOSURE
for SELV circuitry must be 94V-1 (the requirement in UL 1950 since first
published) -
subject to Clause 4.4.5.2 exceptions.
As provided in Clause 4.4.5.2, 94HB is permitted, BUT ONLY if
"components in a secondary circuit" are supplied by a "limited power
source"
as defined in Clause 2.11.
I would say that this is a false report - unless/until UL amends UL 1950.
And to repeat, I have not heard anything about a pending amendment nor have
any advisory memos to this effect been mass mailed by UL to its Clients.
Please respond to sbtan%[email protected]
To: emc-pstc%[email protected]
cc: (bcc: George Alspaugh)
bcc: George Alspaugh
Subject: Plastic Material
Hi,
Did anyone hear that UL intends to enforce the following with effect
on Jan 98 with a transition of half to one year that :
" The minimal plastic requirement for SELV is going to be 94V-1
instead of HB as previously indicated"
Does anyone know if this enforcement is referring to :
a) Printed Circuit Boards
b) Immediate fire enclosure material(eg: the enclosure of AC-DC adapter) ?
c) Does it affect only UL listed product & not UR(Component)
registered product ?
d) If point (c) refers to both products, then does it imply that all
component regardless of what type( such as thermal gap, connector,
capacitor etc.) also required to be 94V1 or better ??
Can someone please advise.
Thanks in advance
Best regards
Jasmine Tan
Compliance Group
Creative Technology Ltd
