However, since the contractor considers it to be a significant improvement of the "General decoupling" system (GR) and the reliability of such a "security" system is not reduced, such as the "General uncoupling" (GR) system and the traction power system as a whole, it may be installed within the board, with the basic condition that for safety reasons the relevant paragraph § 4.3.2 of the performance specification T_D R 15350, i.e. will be equipped with a built-in key, the key will be one and Unique (Code and serial number, etc.) for the whole system "general uncoupling" (GR) of the Metro "Thessaloniki", will have nothing to do with the other keys of the repair and/or the project, will be provided similar labels, describing its operation.
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