In message bccfb88541b04d419dbc184fcf787...@tamuracorp.com, dated Thu,
26 Jan 2012, Brian Oconnell oconne...@tamuracorp.com writes:
NCB = National Certification Body
CBTL = Certification Body Test Laboratory
We have accredited test houses (accredited by national accreditation
services to
Within the implementation of the goods package in the EC
most ce marking related directives (if not all) are being upgraded
to reflect a single way of handling approvals, market surveillance
and so on. From the concept NEW EMCD I copied the following definitions
to be used in the approvals process
I don't see any hint of a EU directive just the CE mark but without
reference to directives. It could simply mean that they have RoHS.
The current RoHS is not a CE marking directive. The newly published one
will be, but it hasn't taken legal effect yet.
This does not, of course, answer
I'm making some headway on this but seem to be at a roadblock with the solid
state contactors. Crydom was at one point providing SCCR ratings for their
product with fuses. They have since stopped doing this. What are others doing
to get past the 5kA threshold
To answer my own question it
Happy Friday everyone
I am asking a question that I already know the answer to, but I am
trying to determine if it is common knowledge or if it was something
that I picked up along the way and have always accepted as being true.
If you were to see a product with a marked electrical rating of
Hi Kevin,
The 120-240V product is auto-ranging and can use either voltage with no special
action required. The 120/240V product will have a voltage selector switch. I do
believe this is common knowledge, at least among product safety engineers. ;)
Scott Aldous
Compliance Engineer
AE Solar
Presumably:
Something marked 120-240V should run at any voltage in that range, and you'd
just need to plug it into a suitable supply (one would hope that it is also
rated to cover both 50Hz and 60Hz supplies).
A 120/240V making is an either one or the other indication, so there might
well be a
It's probably common knowledge on THIS forum that 120-240V indicates an
autoranging power supply and 120/240V indicates there is a switch setting for
one or the other. I'll bet the average consumer has no idea, though.
Jim Hulbert
-Original Message-
From: emc-p...@ieee.org
Fully agree with Jim!
John Allen
London, UK
On 27 January 2012 15:39, Jim Hulbert jim.hulb...@pb.com wrote:
It's probably common knowledge on THIS forum that 120-240V indicates an
autoranging power supply and 120/240V indicates there is a switch setting
for one or the other. I'll bet the
Is it likely that the average consumer even reads the reg. label for ratings?
Kaz Gawrzyjal
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of allen john
Sent: Friday, January 27, 2012 9:56 AM
To: Jim Hulbert
Cc: emc-pstc
Subject: Re: Is this common knowledge - Electrical Ratings
I'll go farther and suggest that the average consumer doesn't even know the
label is there.
Ghery S. Pettit
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
kazimier_gawrzy...@dell.com
Sent: Friday, January 27, 2012 7:57 AM
To: john_e_al...@blueyonder.co.uk; jim.hulb...@pb.com
Perhaps these days are long past, but there was a time when some switching
power supplies were designed as 120/240 supplies without a mechanical
switch. They used two energy-storage capacitors in series. At low line
voltage, the input rectifier diodes were configured (electronically) as
I'm probably just restating Donald's note below but / means that it has two
distinct inputs 120 or 240. The hyphen indicates a continuous range of
operation from 120 through 240. The definition is buried in EN60950 somewhere
but I forget exactly where. That of course doesn't mean that it
Kevin et al,
In my experience over the years, 120-240V indicates a universal input whereby
the power supply is intended to operate at any voltage within that boundary
(with tolerancing of course). And, 120/240V indicates that a power supply is
intended to operate at only those 2 voltages(again
Marked 120/240V would not necessarily mean a switch needs to be flipped or a
selector moved, it could still be auto-ranging. But something marked 120/240V
would not be expected to operate at say 150V but something rated 120-240V
should.
I would expect something marked 120/240V to operate in
Thanks everyone for your response. Everyone who responded to me on
the forum and privately was correct that 120-240V indicates a range,
and the product can operate at any voltage over that range. 120/240V
indicates that the product can only operate at those specific voltages
(plus tolerances).
Cannot believe that fellow power suppliers did not jump on this.
My employer has a active and popular model series of component power
supplies rated 120/240V. Only time that we dived into the lower-end market.
Very simple and reliable thyristor-controlled auto-switch, with very small
dead-zone.
Kevin,
Note also that here in the US, in Canada, and other countries with power
systems similar to that of the United States, nominally 120 V to ground, 60
Hz, residential single phase, 3-wire power is identified as a 120/240 V ac,
single phase, 3-wire system. This consists of the two live
Lasers sold in the US must be registered with the FDA. Sold in the EU you can
self declare. Laser standards apply to an end product, not the laser
subassembly(I find many manf's don't realize this fact). The requirement to
test a laser is driven by the safety standard that applies to the end
Dans experience reminded me of a guy who bought a 120 V
coffee maker as a present for someone in (old) England.
Having some knowledge of AC supplies he bought a 240 V to
120 V travel adaptor so the coffee maker could operate on UK
240 V mains. Unfortunately the adaptor consisted of a series
I have seen people make this mistake a number of times. A diode does NOT
reduce the RMS voltage by a factor of 2. It reduces the POWER by a factor
of 2 (full power half of the time). Reducing the RMS voltage by a factor
of 2 will reduce the power dissipation in a resistor (i.e., electric
Correct.
Surprisingly, we had a client attempt to do that on a product so that it would
operate on either 120 U.S. or 230 EU. The heater did work without a problem,
but it failed the required power harmonics test miserably. There is
also wording in EN61000-3-2 stating that half-wave
In message 4f22e536.60...@ieee.org, dated Fri, 27 Jan 2012, Mick
Maytum m.j.may...@ieee.org writes:
Dans experience reminded me of a guy who bought a 120 V coffee maker as
a present for someone in (old) England. Having some knowledge of AC
supplies he bought a 240 V to 120 V travel adaptor so
In the mid-1930 in the USA, there were some radios designed with 3-wire
power cords -- two copper conductors and a third resistive conductor. This
was because the heater string voltage added up to 69 volts (at 300 mA) for
a typical 5-tube radio. These cords soon acquired the nickname 'curtain
Dear Members,
From a quick Google search, it seems S. Korea accepts transmitter modular
approval
(http://www.nwemc.com/news/2011/02/18/korea-rra-announces-new-emc-regulations-including-new-kc-mark/
In message
of237cb435.ac0c42c8-on88257992.0067506c-88257992.0068c...@selinc.com,
dated Fri, 27 Jan 2012, don_borow...@selinc.com writes:
In the mid-1930 in the USA, there were some radios designed with 3-wire
power cords -- two copper conductors and a third resistive conductor.
This was
My nifty Samsung TV is rated 100-240, 50/60 Hz.
Per the discussion here:
100-240 indicates a continuous range;
50/60 Hz implies two discrete switchable ranges.
As mentioned in this discussion, 50/60 implies a
range of frequencies between 50 and 60 where the
TV would not operate. Of
This from a collector and restorer of antique electronic equipment,
especially pre-1950 radio sets.
The 'curtain burner' moniker came [I think] from the fact that radios of
the period were commonly located near a window for ease of bringing the
antenna connection in from outdoors and the cord
Regarding the sewing machine with two distinct ratings - this is somewhat
common, and I have done it for some of my employer's products. The label
should clearly indicate the regional basis of the ratings. That is, there
should be an agency's NRTL/SCC logo associated with the 120V, and a CE or
A very nice example of another use of the 120/240V nameplate marking
___
Ralph McDiarmid | Schneider Electric | Solar Business | CANADA |
Regulatory Compliance Engineering
From:
Don Gies
In message EF296E6C3C5548BFB0F6C34B8313B6BB@RichardHPdv6, dated Fri,
27 Jan 2012, Richard Nute ri...@ieee.org writes:
120 V, 50/60 Hz certified by UL and CSA.
220-240 V, 50/60 Hz certified with CE and others.
The ratings are distinctly separate, but on the
same label. No switch. Its
I thought you did pre-market notification with CDRH for laser products. I
was not aware you register them. Besides, CDRH does not review the reports
you send them. They acknowledge that they got them and that's that. You will
find out more when the FDA audits your facility about what procedures
Basis for rating info on label of consumer product based on regional
electric code and marking requirement in scoped safety
standard. Basis for
rating on a component is to verify comformity. Note the rationale in
60950-1: Equipment shall be provided with a power rating marking, the
The cord-set rating is determined by the equipment's rating. The cord-set
rating cannot be used to determine power requirements. The plug on the
cord-set will limit the user to a specific range of mains ratings (and is
marked with rating), but is not intended to indicate any specific
performance
Not the usual consumer... but I recall as a young and curious sort, looking at
these labels to figure out what they meant.
The curiosity probably meant I'd end up in this line of work. I had figured
out that the volts, current, watts, fuse and circuit breakers had a certain
relationship that
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