Electrical and control system equipment and materials for installation in hazardous areas shall be labelled according to IEC markings, listed, certified, accepted or otherwise determined to be safe by nationally or internationally recognized testing authorities. 

Ex (Explosion)-proof and/or intrinsically safe equipment shall be used at flammable gas and/or flammable gas leakage hazard areas according to the related standards (CH4 or any others). 

Contractor shall follow the regulations and/or rules about the Hazardous Area Classification according to the following standards/directives and shall design/provide Hazardous Area Classification Lists and Drawings, where hazardous risks may arise for flammable gas/vapours, atmospheres: 

 EN 60079-10, IEC 79-10: Electrical Apparatus for Explosive Gas Atmospheres. 

 CEI 31-35 and 31-35/A: Electrical Apparatus for Explosive gas atmospheres - Guides for classification of hazardous areas. 

 ATEX 95 equipment  directive 94/9/EC, Equipment and protective systems intended for use in potentially explosive atmospheres 

 ATEX 137 workplace directive 99/92/EC, Minimum requirements for improving the safety and health protection of workers potentially at risk from explosive atmospheres 

## 8.5 High Voltage Switchgear and Transformer Stations 

## 8.5.1 General 

High voltage switchgear and transformer stations shall be designed for safe, reliable and maintenance free operation under the environmental conditions at the sites. 

Transformer rooms, medium voltage cubicle rooms, generator rooms and, all panel boards, will have steel sheet door (it will not be used aluminum, approval will be taken from electrical authority, they will be accordingly with TEDAŞ type MOD type electrical rooms standards. It will have minimum 2000 mm width and 3500 mm height. 

The design and specifications for transformer stations shall be approved by local electricity authorities. 

Mains supply voltage from local energy suppliers for plant, main inlet, current/voltage transformer ratios should strictly be considered in selection of transformer and medium voltage cubicles. 

Supplying energy for the Plant, obtaining energy permission, depositing all the legal fees, supplying & installation of energy power transmission line, making connections to end pole to be foreseen at the border of WWTP, supply & installation of 34,5 kV MV XLPE cable to be laid between end pole and incoming MV cubicle, which is installed in transformer station in Plant and cable terminations to inlet MV cubicle are within scope of local administration. (Municipality or organization who have work to be done). Contractor will notify demand regarding with plant to Administration. 

The equipment is located at the treatment plant property and is supplied under this Contract and is owned by the Employer. Nevertheless, it shall be possible for skilled representatives from the power supply company to get unlimited access to the transformer installations. 

The components of the stations shall be a standard construction provided with standard equipment and delivered ready for easy connection and reliable and safe operation. 

The stations shall consist of: 

 High voltage section with power circuit breakers, earthing connectors, over voltage protection equipment, volt and ampere measuring transformers, 

