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. 

## 8.16.6 Cable identification 

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. 

Where cables are installed in duets, the cables shall be identified with the cable reference number within each cable draw chamber. 

## 8.17 Security Systems 

## 8.17.1 CCTV System 

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. 

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 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. 

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 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. 

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. 

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. 

A digital video recorder shall be supplied. 

CCTV system will have IP 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. 

PTZ SPEED DOME CAMERAS: 

## A. Performance Requirements and General Specification: 

