CISPR 12 does not apply to such a charger. This is quite explicit in the
Scope clause. I would tell you to go to the IEC Webstore and take a
read-only look at the Scope, but perversely, what you get is the French
version.
CISPR 12 covers radiated emissions, 30 MHz to 1000 MHz, so I don't
understand what you are getting at with conducted emissions below 200 kHz.
On 2025-08-22 19:46, Brian Gregory wrote:
Hello,
We market an EV charger to the N. American market. We've been
contacted by major automotive OEMs for partnerships, some white
labeling, etc.
Recently, one decided to test a charger in chamber with an EV to
CISPR12 levels, even though it's an off-board charger qualified as a
residential appliance.
So, while the unit passes FCC Class B emissions, some testing during
EV charging shows emissions above CISPR12 limits. We and our
potential customer are trying to reason out why the unit failed,
and what are the implications for passing FCC Class B, while not
passing CISPR12.
The way I like to approach sticky issues on the edge of compliance is
to identify and address the hazard posed.
So, with EMC emissions some number of dB(uV) above those limits (all
towards the low end of allowed conducted limits, < 200 kHz), in a
typical residential installation on or near a garage, and typical
usage, i.e., not closely attended for any extended length of time:
what are the hazards or risks posed?
Not being much of an EMC guy, I've never really had to think too much
on this issue. Being a long time safety guy, I have NEVER had an
issue related to EMC from which to draw experience.
What say you, my colleagues?
Colorado Brian
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