59 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  Cables with different voltage levels shall be laid in different trays. If they are designed to be laid in the same  tray (by using separators) due to small cable quantity in certain tracks, the approval of the Engineer shall be  taken.  In cable connection; proper cable termination accessories and materials shall be used where necessary.  Cables and cable cores shall be identified at both ends by means of sleeve bands bearing the cable/core  reference number, which shall relate to the reference number shown on the drawings. Where multiple cables are  laid in troughs, duets, clipped on tray over long runs through several rooms in buildings, or laid in ground close  together, intermediate markings to identify specific cables shall be applied.  8.16.6 Cable identification  8.17 Security Systems  8.17.1 CCTV System  A. Performance Requirements and General Specification: 8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc  PTZ SPEED DOME CAMERAS:  Establishing of camera system by the Contractor for WWTP site and monitoring/following of work progress by  parties during its construction with this system on Internet. To realize this, camera system should be provided  with internet system (IP type) by the Contractor during construction period as per technical spects mentioned in  Employer’s Requirements. After construction period and before provisional acceptance, this camera system  should be renewed, and new system should be started up and handed over.  CCTV system will have IP cameras.  A digital video recorder shall be supplied.  Cameras shall be designed as fixed type for views of buildings and movable type for other zones. Connection  between cameras and NVR devices shall be implemented via fibre optic cables.  The central control unit shall be installed in the control room. The panel with its associated marshalling and  mounting cabinets shall include all the functional groups necessary for the faultless function of the complete  CCTV system at its field and auxiliary devices. The camera to be installed in hazardous area must have explosion-proof housing suitable for hazardous area  classification. Where the cameras will be installed in the severe environment, the housing shall be protected  against the expected adverse effects. All cameras shall be state–of-the-art system cameras. The cameras shall be installed within explosion-proof  housing, where necessary, suitable for the installation under the prevailing environmental conditions. The system and its transmission facilities shall be designed, constructed and installed in a way that a clear and  sharp picture is obtained on the monitors under poor ambience and power supply conditions.  The system mainly consists of a certain number of cameras, picture transmission systems and amplifiers, cross  over video matrix and quadrant device, video switching system and video recording device.  The CCTV system will be used to observe all the critical equipment and places such as monitoring of the  entrance, Administration building, the inlet flow pumping station, the dewatering building, roads, borders and  pumping stations. A monitor shall be installed in the control room. The picture shall toggle between the  cameras automatically. Where cameras are installed, sufficient illumination shall be established.  Where cables are installed in duets, the cables shall be identified with the cable reference number within each  cable draw chamber. 