Trunking cable trays

Earthing Systems

In electricity terms, earthing is connecting a conductive ound via a conductive path.

Protective EarthingProtective earhing (RA) is earthing of metal parts -that do not carry voltage under normal operation but may carry voltage due to a fault- in order to protect people or other living things against hazardous touch or step voltage.In a low resistance protective earthing, a fault voltage is fed through the faulty circuit during the fault, therefore enabling the breakers toinstantly break the circuit and therefore cut the energy on the faulty circuit.

Operational and Functional EarthingOperational Earthing (RB) is the earthing of the voltage of active parts of operational devices of an electrical facility that are under voltageagainst earth in attempt to keep at a specific value (e.g. star point earthing)Functional Earthing (RF) is earthing of a communication facility or an operational device in order to resume the desired function.