electrical installation

means any machinery, in or on any premises, used for the transmission of electricity from a point of control to a point of consumption anywhere on the premises, including any article forming part of such an electrical installation irrespective of whether or not it is part of the electrical circuit, but excluding-

a)	any machinery of the supplier related to the supply of electricity on the premises;

b)	any machinery which transmits electrical energy in communication, control circuits, television or radio circuits;

c)	an electrical installation on a vehicle, vessel, train or aircraft; and

d)	control circuits of 50 V or less between different parts of machinery or system components, forming a unit, that are separately installed and derived from an independent source or an isolating transformer;