IEC 61000-2-5 was compiled from historical sources, so is reliable.
Regarding point a., there was an assumption that broadcast receivers
would be uncommon in the industrial environment. Note also that, because
of European language differences, 'industrial' in the context of
'Classes A and B' means, in British English, 'heavy industrial', and
'commercial' is the same as 'domestic' or 'residential'. Before these
classes were introduced, the original IEC 61000-2-5 identified five
major environments, not just two, and two is really a simplification
step (by the European experts) too far. In the intervening years, a
'power station' environment has appeared, and more recently there has
ben a move to separate 'professional' and 'commercial' environments from
'residential'.
On 2024-11-09 16:19, James Pawson (U3C) wrote:
Hello all,
I’m writing some guidance on Class A vs Class B and I was thinking
about the Why. As in why do we separate emissions into Class A and B?
Reasons I’ve heard (which make some kind of sense even if I’ve not
actually looked into the figures) include:
1. Concentration of electronic equipment – domestic premises are more
likely to have other interference equipment operating in closer
proximity to receivers than in a commercial/industrial environment.
2. Quantity of devices sold – consumer devices used in a domestic
sphere have a much higher sales volume
3. Nature of installation – Class A equipment installed by more
technically competent users, Class B installed by less
knowledgeable users.
Does anyone have any additional justification, historical perspective,
or can point me in the direction of a standard that describes this in
more detail?
I’ve looked in IEC TR 61000-2-5 which, although it mostly focuses on
immunity, mentions these above reasons. CISPR 16-4-4 seems to deal
with statistical methods. IEC TR 61000-1-1 deals in general terms with
the concept of a margin between Emissions and Immunity. But no
definitions for the derivation of these Classes…
Thanks in advance!
All the best
James
James Pawson
Managing Director & EMC Problem Solver
*Unit 3 Compliance Ltd*
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