Moshe,
If you are having safety related problems at the test site I
would recommend that be your first priority not documentation catch up.
You may want to try taking an ESD gun to you customer site and run ESD
tests on the cables to start with. Try taping a conductor along each
cable.
One other point. Make sure you know what current you're handling. 8 a
and 120 Vac is 960 VA drop that to 30 Vdc and the equipment still needs
the power delivered but now your're talking 32 amps. Just an example but
it makes a point.
Gary
-Original Message-
From:
Hi Peter:
1. Can someone explain a polarized plug.
A polarized plug (and mating socket) is one which
maintains the neutral conductor of the power
source through the socket/plug to the product.
A polarized plug can be either 2-wire or 2-wire
plus grounding. (For the
Hi Peter:
I'm not an expert in UL 508, and have been only
peripherally involved in some product certifications.
So, my comments may not be highly accurate.
As a general rule, UL almost always allows testing
in lieu of constructional requirements. This is
specifically stated in the Foreword
Hello all,
If you are going to be in the Boston area on 18 NOV, don't miss the
Northeast Product Safety Society's 4th Annual Vendors; Night. 40 Tables
full of product safety and emc resources. The best show of it's kind in
the USA; For full details see our website at: www.safetylink.com/#NPSS
Dear Group:
Our company manufactures commercial food equipment designed primarily for
60 Hz applications and is, almost without exception, UL Listed. We also
export this equipment to many countries around the world and many times it
is modified to work at different voltages and at 50 Hz. The
Greetings,
Please note that IEC 950 and all its clones, specifies in Clause 2.3.8,
last dashed paragraph:
--SELV CIRCUITS shall not use connectors compatible with those specified in
IEC 83 or IEC
320.
Very straightforward requirement. It doesn't mention or imply any
exclusions, so this applies
Moshe, PSNet
to answer your 1st question...
The MD specifically calls for a risk assessment of the machine.
The drafters of the technical aspects of the MD give this guidance: The
manufacturer must therefore identify the hazards associated with his
machinery and the corresponding
Dear Richard,
I understand that UL is working on an MOU with Argentina. With that in mind,
you might want to contact the Technical Assistance to Exporters office at
your UL location.
Good Luck,
Ray Russell
ray_russ...@gastmfg.com
-
This message is coming from the emc-pstc discussion
Martin Johnson wrote:
Any pointers to good information for EMC related problems on CAN bus
systems would be appreciated
Ideally looking towards ESD, transient immunity and radiated emissions
etc.
Martin
Martin
I am not sure where you are located, but there is a one day seminar on
EMC
Which brings up the question about whether central office DC supplies which in
some countries or circumstances run up to 70 volts should be considered SELV
circuits.
We do not treat the central office supplies as SELV at Motorola. Isolation is
provided in switching supplies as with ac mains
Hello all,
I am seeking the whereabouts of Bob German who is (was?) an EMC consultant
for Henry Ott Assoc. in the Boulder Colorado area. Any help is
appreciated and may be sent directly to my email address.
==
Doug Powell, Compliance Engineer
Bob,
At 01:31 PM 03/11/1998 -0500, you wrote:
Which brings up the question about whether central office DC supplies
which in
some countries or circumstances run up to 70 volts should be considered SELV
circuits.
No, if they're over 60 V dc, they shouldn't. By definition, SELV must less
than or
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