In message <[email protected]>, dated Wed, 9 Sep
2015, Richard Nute <[email protected]> writes:
In the IEC, rated voltage is a value assigned by the manufacturer.
Agreed; I introduced that simplified definition.
For years, standards committees have attempted to specify one or more
formats for the voltage rating. Each standard is different, and
sometimes each edition is different.
Supply voltage rating is a special case, since indeed it may be
multi-valued, but few other 'rated values' are multi-valued. IEC 61293
(also EN 61293) (formerly a TC16 document, now TC3) specifies how supply
voltage data shall be indicated. This was taken over from an original
incentive of TC84.
The problem is when a manufacturer uses a single, nominal value. We
know that line voltages vary, so standards committees choose, say, +6%,
-10%.
I'm not sure that's relevant to how the manufacturer *indicates* the
rated supply voltage.
We have commonly seen wide-ranging power supplies rated 90-250 volts.
But, we cannot fault a manufacturer for rating his wide-ranging product
as 150 volts, +166%, -60%.
Not in accordance with IEC 61293. In any case, we do not know that the
560 V is a supply voltage.
With your i-Phone, you can easily calculate whether the equipment will
operate on your power line!
In this case, the manufacturer has rated his product to operate from
470 to 728 volts. What is wrong?
According to IEC 61293, that is indicated by '470 V - 728 V'.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
When I turn my back on the sun, it's to look for a rainbow
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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