To set the circuit protective conductor (CPC) of the circuit, choose the earthing tab (1). The properties of the CPC depend on the cable being passed. In our case, during the configuration of the circuit protective conductor, special settings are provided for armoured cable arrangements (2). The adiabatic check (3) indicates the minimum size of the CPC. For distribution circuits the engineer may choose to use extra local earthing to reinforce the earthing of the installation (4). For the Main Distribution Circuit we will choose the first option, Cable armour.