Brian,
I am not sure what the issue is here. If a product requires user
intervention to select line voltage, that should be specified in the
installation instructions and user manual. If the product does not
require user intervention, then that is a selling feature and can
(should) be stated in the installation instructions and user manual.
That said, the label on the product itself should specify at what
voltages the product will work. Being a stickler for semantics and
accuracy, in voltage ratings the solidus means either / or, one or the
other. The dash means anywhere from here to there and in between too. So
whenever I see 120-240, I always want to ask the designer if it works at
167 V.
That the product can be plugged into any voltage the user chooses is
irrelevant. Users are users. What matters is what you the manufacturer
declare is or are the operating voltage(s) or range of voltage(s). If
the user uses the product at a voltage outside the range, what can you
do? As long as the product is still safe, if it still works, the user is
lucky. If it does not work, the user has the problem, not the manufacturer.
In more than 25 years, I have not seen anything written or required to
be written about auto-ranging or auto-sensing power supplies. Likewise I
have not seen any symbols for auto-sensing either. I have once or twice
seen a removable label placed over the power entry module announcing the
product was auto-ranging and user selection was not required (or
something like that).
No advertising here but look at the second page of this link. Half way
down on the right side of the page under the Power heading. Found with a
Google search for "auto-sensing symbol". No symbol provided, just the
text.
http://www.tandberg.com/collateral/product_brochures/TANDBERG_95_85_75MXP.pdf
Scott
On 2/7/2012 7:39 PM, Brian Oconnell wrote:
Have noted that IEC61293 is referenced in 60601, but is not in 1010 or 950.
Do not understand because 61293 is published in LVD, but not in MDD.
Believe that 61293 says that the 'x/y' rating for a power supply indicates
that must be manually switched between the various voltages. How does that
affect a power supply rated for auto-sense (no user select required)? Unless
we have a phrase or symbol to indicate an auto-sense and a user-selected
input, can we consider 61293 harmonized? We make some stuff that is rated
120/240, or 100-120/200-240 - but can be plugged into 85V to 265V with no
user select.
Doug Powell advised use of '!' notation for user manual. Other ideas?
Also, why such a long time to stability date? Typically 3 to 5 years?
Brian
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of John
Woodgate
Sent: Tuesday, February 07, 2012 2:09 PM
To: [email protected]
Subject: Re: Rating Label Nomenclature for Auto Voltage Select Devices
In message
<64D32EE8B9CBDD44963ACB076A5F6ABB01C6A8D2@Mailbox-Tech.lecotech.local>,
dated Tue, 7 Feb 2012, "Kunde, Brian"<[email protected]> writes:
On rating labels for devices, is there a common nomenclature to
distinguish if a multi voltage range device, such as a 115V/230V ac
device, is auto-sensing requiring no user action or if it requires a
manual operation such as changing voltage select switches or internal
wiring?
Didn't we discuss this here only a week or so ago? In a nutshell,
115/230 means you have to change a setting: 115-230 means you don't, but
it doesn't guarantee that the product will work on some weird
intermediate value such as 160.
There IS a standard, not well known:
IEC 61293
Edition 1.0 (1994-06-22)
Marking of electrical equipment with ratings related to electrical
supply - Safety requirements
Stability Date: 2016
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
If 'QWERTY' is an English keyboard, what language is 'WYSIWYG' for?
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