One company I have worked with had an internal rule for "radiated emissions": You had to be 10dB (1 order of magnitude) underneath the limits before going for a formal cert. Non-negotiable.
Part of the reason for this rule was that they:
1) OEMed their products.
2) Sold products that could be used in complex and bespoke CAN networks with goodness knows what else.
3) There was a chance of interfering with Marine VHF radio which is used for emergencies. The EU rules were (still are) not actually strict enough for preventing interference with that band.
Part of the reason for this rule was that they:
1) OEMed their products.
2) Sold products that could be used in complex and bespoke CAN networks with goodness knows what else.
3) There was a chance of interfering with Marine VHF radio which is used for emergencies. The EU rules were (still are) not actually strict enough for preventing interference with that band.