Consider an electronic device (ITE or other) that is powered from the
secondary of a low power, 24V transformer. We sell the device and a
transformer as a set to end users and the set has been tested to the
appropriate EMC standards. We also sell just the device to dealers, some of
which purchase the device without the transformer. Those dealers assume the
responsibility of mating an acceptable power source with the device.

Are we required to perform any additional EMC tests for the configuration
that does not include the transformer, or is it sufficient to test with the
transformer and list both configurations on the Declaration?

Richard Woods

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