Hello Group,
I'd like to know if is it safe for somebody to have his office 7 meters
away from a high voltage line (132KV, 50Hz)?? The working time of the
person is 8 hours a day.
Thanks in advance
Muriel
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This message is from the IEEE EMC Society
Hi Doug:
Does this section mean to say that the voltage on internal SELV may in
fact go higher than the 71V Peak and 120 V DC for a short time? Naturally,
The standard says:
In a single circuit... other parts of the same circuit
do not comply with all of the requirements
From: Ned Devine [mailto:ndev...@entela.com]
Hi,
Hi, Ned.
OK, I wasn't going to say anything, but.
1.A UL Listed product complies with all of the applicable
requirements. Usually from a standard.
2.A UL Recognized Component does not comply with all of
the applicable
All -
In addition to all of the other comments (all essentially true), I would
like to clarify one issue, touched on by Rich Nute, but not made as clear as
could be. The backwards UR ligature is copyrighted by UL and can not be
applied to a product certified by another NRTL, without violating
IEC950 is not officially withdrawn yet. We received a draft CB-scheme
test report February 2000 based on IEC 950, with 97-06 amendments.
EN 60950 is based on IEC 950. Eventually IEC 950 will become IEC60950
to simplify the numerology. Provisional and draft documents
Hello group,
My company manufactures high energy power conversion equipment and we often
deal with insulation between mains voltages and SELV as well as high voltage
outputs and SELV. During part of our type testing we simulate single fault
conditions such as a breakdown of basic or
Thanks a lot for your inputs.
All responses to my second question are only concerned with the inductance due
to long distance between chip and decap. Nobody seems to agree imposing
another constrain to the distance. My question was
Do we really have to limit the distance letting the charge
My advise is to have your products evaluated/tested to the old and new
standards, and have this documented on your test report.I've done this
before with UL standards.I've not had this experience with a CB Scheme
report, but I fail to see why that should not be allowed.Later, when
Sam, did you use English or symbols and country codes?
Richard Woods
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From: Wismer, Sam [SMTP:wisme...@lxe.com]
Sent: Monday, May 15, 2000 3:03 PM
To: wo...@sensormatic.com; emc-p...@majordomo.ieee.org
Subject: RE: RTTE
Richard,
Richard,
My product and packaging labeling does not list the countries independently.
I simply stated on the labels that this equipment is intended to be used in
the EU/EFTA except for Spain and France, since our equipment is ISM that
uses the whole 2400-2483.5MHz band. However, I clarified that
Carla et al,
I had recently asked a similar question regarding IE60950 3rd Ed. and its
acceptabilitty, which also included the CB Scheme. I received very little
response which I think was due to many not knowing themselves.
After thinking about this while this thread has now resurfaced, I feel
The temperature of the heatsink should also be concerned when we determine
the use of the adjacent components such as PCB, wires, capacitors' operating
temperature rating and plastic parts... etc...
Tac Pham
HC Power
PowerOne TSD
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This message is
Greetings!
I am seeking information on when will the 3rd Edition of the EN60950, L.V.
Directive, go into effect? When will it be ratified for the European Community?
Carla Robinson
3Com Corp.
847-262-2494
carla_robin...@mw.3com.com
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This message
Table 16 in UL 1950 third edition has a temperature rise table that
gives you their view of hot surfaces, I know that many on the list feel is
should be more detailed. With that and your particular construction you can
determine your needs. I wouldn't stop with the safety agencies
FAQ: Sources of EMC Safety Compliance Information
This is to let you know that I have just posted in two parts the 49th
issue of the above FAQ to the newsgroup for regulatory/compliance matters
and EMC and safety specifications and testing,
UL marking means pretty much what UL decides it means.
Classification can also means (as in the case of X-Rays) that certain
aspects that may be hazardous were not evaluated (i.e. the physiological
effects of x radiation)
-Original Message-
From: owner-emc-p...@ieee.org
I recently did some EM field measurements in the vicinity of a GSM base
station. It is a typical urban base station, with sector antenna (gain
16-17dBi) and four 50W transmitters (minus some loses in the cables and
splitters). Urban transmitters are generally limited to 1kW ERP, so the
situation
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