I'm late too!
The CE Mark must be applied to all products that fall under the New Approach Directives. some of those Directives that probably apply to you are; Machinery, Low Voltage (any thing with an input of 50 VAC/75 VDC or greater) EMC ( radio Frequency emissions and Immunity for all electrical equipment), Pressure Vessels, Medical devices, protective wear, Toys and Explosive atmosphere (haz Loc). There are many others but these are the ones that might effect us.
The CE Mark has to be applied to any products that fall into the scope of the mentioned Directives. It's mandatory if the product will enter the EU market place. It dosen't matter if the same company issue a peice of equipment to a sister company in Europe, once it enters Europe it must conform. There are many court cases going on right now and the list is growing.
Usually your worsed enemy is your competitor. They are the first to buy your product and then have it challenged by the local agencies. It helps them to market their product while you have to go back through certification process. It can be quite time consuming and expensive if a challenge is made. At this point there is no cutting corners you must cross every "T" and dot every "I" to prove compliance.
