John
I would be interested to see the latest draft of IEC 62368-1. I assume
this is Edition 2.
On surge protective components the original IEC 62368 introduced a safety
test run at twice the the nominal AC voltage with decreasing values of series
resistance. I would like to see a similar test run on MOV components that
incorporate a thermal disconnect, in fact I can make it so.
Both IEC 62368-1 and IEC 61010-1 use the term "varistor" If you look up
"varistor" you find
IEV ref 151-13-23 varistor
resistor the resistance of which is strongly varying with the applied voltage
Varistor and VDR can be applied to a range of components such as MOVs,
Avalanche Breakdown Diodes, Zener Breakdown Diodes and Punch-through Diodes.
Yet most times when the above standards use "varistor" they really mean MOV.
This colloquial use of "varistor" can lead to confusion in other language
versions.
The IEC has a mechanism to catch such inexactitudes - copy the appropriate SC
for the topic being discussed. Unfortunately neither TC 66 or TC 108 allow SC
37B access to their documents.
Regards
Mick
John Woodgate <[email protected]> writes:
> I have received a reply from TC 66 that they will consider the clause F.3.2
> problem at their next meeting in October. They have acknowledge that the
> usage of the term “clamping voltage” is imprecise. They would be receptive to
> any further inputs on this matter.
Would you like to check the latest draft of IEC 62368-1 to see if it treats the
subject correctly?
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
Instead of saying that the government is doing too little, too late or too
much, too early, say they've got is exactly right, thus throwing them into
total confusion.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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