As it has been repeatedly commented on by the AM, for reasons of safe access for technical staff in maintenance and repair situations of the external DC board equipment (Sdd's, Q89Sx, DLI, RSx, PAxx, etc.) of the component "Pylaias", the contractor should study and apply an appropriate mechanical locking system with keys between the power switches ' ' HSCB/Q54Dx ' ' of table 750V DC (technical space 8.1.1) and all the downstream switch-off switches, which are foreseen to be installed on Access and testing trajectories, laundry, deposition, maintenance and train repair operations of the component "Pilaias", to avoid a voltage return from improper handling and fatal injury to the technical maintenance personnel (operator) of the metro system.
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