There are many items of plant that have interconnected metallic parts.  Large scale driers, such as fluid bed or spray driers, as used in the pharmaceutical or food processing industries, have a product bowl, filters or ducting that are often disconnected in everyday operation.

These parts may have insulating gaskets etc. between them and could be isolated from earth if they are not properly reconnected using their bonding straps etc.  As it is time-consuming to test these connections after each reassemly, many sites choose to actively monitor the earth condition of such separate sections.

BS5958 states that:  All metallic parts .... should be connected to each other and to earth, so that the resistance to earth at all points is less than 10 Ohms (16.2.1).

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