What constitutes an excluded installation?

In the UK, excluded installation means two or more combined items of relevant apparatus or systems put together at a given place (whether or not in combination with any other item) to fulfil a specific objective, but not designed by the manufacturer(s) for supply as a single functional unit. In effect, an excluded installation is a collection of compliant apparatus. Thus a large installation supplied as a single unit is not excluded, whereas one supplied by a number of manufacturers is outside the scope of the UK Regulations. An example would be a production area in a factory comprising a number of stand-alone process stations each supplied by a different manufacturer, for printed board populating, flow soldering, ultrasonic welding, etc. Each process station would need a Declaration of Conformity in its own right, but the production area as a whole would not. Interpretations may differ in other Member States.