5.6.11 Power Supply
1) It is essential that the electrical power supply is of the correct voltage and phase and adequate for the requirements of the crane. Electrical services necessary during erection procedures should be connected by a qualified electrician. Earthling electrodes, capable of dealing with all contingencies, including electric storms, should be provided for tower and derrick cranes; where cranes are rail mounted, it will be sufficient to earth the track.
2) Operational controls on the crane, not required for use during the actual erection procedure, should be isolated where possible.