Proceed as follows to make the shore power connection:

On the main engine room switchboard, open (OFF) the general magneto-thermal breakers of the on-board services;
Open the switch protecting the shore power connector;
On the dock power column, open the power switch;
Connect the power cable, first to the yacht and then to the shore power column;
Close the power switch on the dock power column;
Close the power switch to protect the power supply to the yacht’s shore socket;
From the main electrical panel, select the shore power supply and monitor the voltage using the relevant instrument;
Only if the voltage level is correct, close the magneto thermal breakers that feed the loads.