There is a further issue because the generic emissions standard EN 50081-1
covers the "Residential, Commercial and Light Industrial" environment, i.e. the
only one it does not cover is the real industrial (EN 50081-2). This means that
all normal commercial applications require EN 50081-1 which specifically calls
up Class B of EN 55022.
The referred standard EN 55022 has classes A and B with a different split: The
tougher Class B is mandated only for the residential environment. Normal
professional ITE products for commercial office use (not residential) are
allowed to meet Class A.
As well as the 10m distance from broadcast receivers there is also an
expectation that Class A products do not use the same low voltage mains power
supply system as residential premises. This is an issue in Europe where
apartments and offices are often in the same building or block. This is spelt
out in some EN documents, including EN 61326-1 section 3.4 which defines Class A
equipment as follows:
"Equipment suitable for use in establishments other than domestic, and those
directly connected to a low voltage power supply network which supplies
buildings used for domestic purposes [CISPR 11]." This means that Class A legal
compliance is often not adequate for some markets.
Not that domestic here means residential and not "US only".
Roger
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