Rick, and group members,
I thought that I would weigh in with an opinion on this one. The definition
of phase should be determined by the requirements of the equipment. If the
equipment only requires single phase power, regardless of voltage, then that
is what should be specified. It does not
The important thing to note is that a good amount of the utility load is not
constant power. It is light bulbs, toasters, coffeemakers, hairdryers and
electric heaters and so on. So lowering the voltage 10 % is the first step -
the so-called brown-outs. Power is a square function, so the new
3.0.6.32.20010504170055.00847...@mail.cinepower.com, Enci
e...@cinepower.com inimitably wrote:
In the UK, what scope does a Trading Standards Officer have with regard
to inspecting compliance with European Directives? (LVD EMC)
As I understand it, they can inspect the evidence to support a DoC
These batteries are not sealed against the release of hydrogen gas that is
generated during the charging process. I once tested for the concentration
of gas in the battery area in a cash drawer enclosure of an electronic cash
register and found a very high level - less than what is required for
Do sealed Gel-lead acid batteries really require vented enclosures?
If so why, they don't vent like the liquid lead acid batteries do they?
Thanks -
Gary
---
This message is from the IEEE EMC Society Product Safety
Technical
It looks like California does run on reduced voltage. See the following
URL, for instance:
http://www.world.std.com/~techbook/seec2_2.htm
http://www.world.std.com/~techbook/seec2_2.htm
It says:
2.2.2 North America
ANSI C84.1 Electric Power Systems and Equipment - Voltage Ratings (60 Hz)
Hopefully, one our European friends will have a better answer, but
my understanding was that in older (don't have a definition of older)
European telco you would find the batter stack with 60 V, rather than 48,
Then you had to worry about the charging voltage and step down power
supplies.
Hi Paul,
I am assuming that you are speaking about telecommunications switching
equipment. The upper end of -72 volts supports -60V battery plant found in
a few German offices with (I believe) Siemens switches. There is every
indication that these systems will not spread to other offices and
Duncan,
Here is the definition of Direct Plug-in Equipment from the EN60950
standard-Equipment that is intended to be used without a power supply cord;
the mains plug forms an integral part of the equipment enclosure so that the
weight of the equipment is taken by the socket-outlet
These are
Can someone explain to me how reducing the voltage will lower the power
consumption, if the load is kept constant. On the contrary, this should
cause an increase in consumption because higher current means increased
copper losses in the wiring. This is the reason why power distribution is
done
Group,
Are there any group members who are familiar with the earth leakage
requirements of UL1419 (Standard for Safety - Professional Audio and Visual
equipment) in section 41.1
Our equipment is a detachable power cord connected, class 1 appliance rated at
100 -250 V.
Section 41.1.9 of the
Daren, you bring up an interesting point. California's energy woes could
possibly be
band-aid if the voltage was reduced 10%. (maybe that is too big of a management
issue, does anyone know?) Assuming that a large percentage of the users don't
have
switcher regulators then that would equate to a
In the UK, what scope does a Trading Standards Officer have with regard
to inspecting compliance with European Directives? (LVD EMC)
As I understand it, they can inspect the evidence to support a DoC and
samples of equipment have to be made available for them if they wish.
Can they inspect
The US 220 came from the days of single phase split winding transformers
yielding
110 to Neutral. Not a three phase thing but, the open-delta two phase
transformers
used in residential distribution, were two split winding transformers wound is a
three phase style with the third winding missing.
The old standby is the HP8566, but it uses harmonic mixing above 2.5 GHz,
which decreases sensitivity. Then there is the HP8593 which also has
decreasing sensitivity above 6 GHz. The 8566 is obsolete, but readily
available. Carnel (to my knowledge) still makes the excellent EMI receiver
series
From the point of view of an electrician or a technician, I can understand,
to some extent, how one could consider a phase-to-phase connection as being
single phase. From the point of view of a design engineer, however, there
would probably be some differences. With a system that references
The new Japan DENAN requirements are not completely clear,
and I know of no on-line source in English to clear up certain aspects.
For example, in the past, AC/DC adapters have required certification
and the application of the Dentori-T mark with cert. number. However,
there was no mandatory
New address:
http://www.cfont.com/
--
From: Peter G Schreiner III[SMTP:p...@sciatl.com]
Reply To: Peter G Schreiner III
Sent: Friday, May 04, 2001 9:09 AM
To: emc-p...@ieee.org
Subject: EMC-PSTC List Archive Site
Being new to the list, I would
SynQor
Lucent/Tyco
di/dt
Power One
Hope that this helps
David B. Goldstein
Principal Manufacturing Engineer
Cratos Networks
313 Littleton Rd; Suite 20
Chelmsford, MA 01824
978-244-0068 ext. 150
FAX (978) 244-0618
dgoldst...@cratosnetworks.com
-Original Message-
From: Peter
Group,
I need some opinions on shipping radio devices to Mexico. Information is
very difficult to get from the SCT directly and our distributors play down
the need for type approval, so I am having difficulties in getting a
straight answer to the legal way to ship product.
My understanding is:
-
Being new to the list, I would like to search the archives for answers to
questions that might have been addressed many times in the past. I have
not been successful in my attempts to link to the archive site that was
provided in my introductory message after subscription to the
list.
What receivers or spectrum analyzers are used for making radiated emissions
measurements to 10 GHz?
Best regards,
David.
David Gelfand
Regulatory Approvals
Memotec Communications Inc.
Dear All,
Does anyone have a list of manufacturers of Approved (UL Recognized/ TUV
Approved) 36-72V range dc/dc convertor with the following characteristics
and at least BASIC INSULATION between the input and output? The dc/dc
converor will be used for a telecom device intended for connection to
Hi Brian.
Just to add a little more fuel to the flames! We
supplied an Instrument to a well known semiconductor Manufacturer in Oregon
which was powered from two 220 volt phases. I marked the rating plate as 220
volt one phase as has been suggested. However the local inspector made us
In my experience, a system that gets its power from a power
supply which for input has either a transformer or a switcher
with a two port input across which is connected one hot line
and one neutral line or two hots out of phase from each other,
that system is a 'single phase' system. Even
All right...
I had heard this from a former nuclear power plant worker (NOT Homer
Simpson, opposite end of intelligence spectrum).
Passed it on as a bit of cynical (realist?) humor...
(the caffeine in the Mountain Dew made me get an early jump on Friday
Funnies)
Daren A. Nerad
EMC Engineer
20010503173419.30021.qm...@www3.nameplanet.com, am...@westin.org
inimitably wrote:
John Woodgate wrote:
According to which standard? Requirements are not identical in different
standards, sometimes for good reasons and sometimes for historical
reasons.
--
Standard :EN60945 / IEC945.
Is
b78135310217d511907c0090273f5190d0b...@curly.ds.cubic.com, Price, Ed
ed.pr...@cubic.com wrote:
The nominal 208 Vrms value exists
from any phase-to-phase pair. The voltage from any phase to neutral is 115
Vrms.
208/sqrt(3) = 120, not 115. 110 V was around in the 1920s, AIUI. By WW2,
the voltage
cefaf4001934d411b06e00805f9593fd6a9...@corpmail2.genrad.com, Chaplis,
Bob chapl...@genrad.com wrote:
Signametrics makes modular instruments that can be installed into a PCI
slot within a PC. Im familiar with only the DMM module at this time. This
module is capable of measuring voltages to 330v,
Hi George,
When I was starting the same kind of search 2 years ago, I asked Dell's EMC
dept. for a suggestion on their quietest desktop pc. The PC was is very
quiet, but the video card made some monitors scream at highest rated
resolution refresh rate. Other video cards will have vastly
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