Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  19 of 124  Galvanize strips will surround structure and will be contacted with 50 mm$^{2}$ stranded copper cable by Cadweld  welding and will be connected with equipotential busbar. All connections except foundation structure strip connection will be contacted with each other by Cadweld  welding.  Structural earthing will be built for all structures and buildings and will be extended such their ending will be 3  m above completed ground level.  50 mm$^{2}$ bare stranded copper cable or equivalent galvanized strip conductor will be laid inside trays and will be  contacted with grounding inside tray and plant.  The strip electrodes shall be of bare copper with conductor size not less than 20 x 4 mm.  The earthing system for each transformer station shall be interconnected with the common equipotential  bonding bar (CEBB) for the Site. This interconnection shall be made of a copper strip or wire with cross section  not less than 50 mm$^{2}$. The earthing system shall be provided with testing joints mounted in a separate earthing cubicle. Testing joints  shall be provided for each earth rod and for the connection point to the earth for the plant. All joints and connections in the earthing system shall be carefully designed to ensure that they produce a non- relaxing joint. Welded, bolted or clamped connections are permitted. All earth conductors shall be marked green-yellow.  8.6 Diesel Generating Set  8.6.1 General  The diesel generating set shall provide power in case of a grid failure; i.e. its power output shall be designed as  a stand by set. As grid failures may occur frequently for the long duration, the set shall be capable of supplying  its rated power continuously. The Contractor shall take all permission about diesel generating set from the  related authority. The generator shall include power meter and this power meter shall be communicated with  SCADA.  Generator will strictly be positioned inside building. Isolation cabinet or sound absorption cassettes will be used  to prevent the high sound as per ER.  Generator will be selected such that it will be prime power. Additional 10% power will be added to total load in  calculation for prime power.  Generator set shall be able to be operated automatically and manually.  The power rating for the generating set shall be selected to ensure that the generating set is not more than 90%  loaded when all specified equipment (refer below) are operating at the same time at maximum capacity at the  given power factor and at site conditions. Rating and performance shall be in accordance with the ISO, at site conditions. In the event that generator need is greater than 1000 kVA, generators which have power which will be able to  maintain 10% additional power of total need and which have synchronization system within each other will be  used. For example 2 Nos 630 kVA synchronized board is necessary for 1250 kVA power requirement. If there  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc 