18 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works   Temperature rise. If the manufacturer can provide evidence covering temperature rise tests for transformers of similar type  and design, Type Test certificates will be acceptable.   Prior to dispatch to site the Contractor shall pass to the Engineer or its representative, in triplicate, copies of  the all test certificates for approval.  8.5.4 Instruments & Power Analyzers  The measuring transformers shall at least include load for the following instruments, all within Class 1:  There will be Multifunction Power Analyzer with minimum 2 Port Ethernet Communication at outlet of all  transformer, generator and CHP units. There will be current, voltage, active/capacitive/reactive power, cos F ,  frequency in power analyzer, it will be able to create alarm, IEC/ANSI power accuracy class will be 0,2 there  will be 4 digital input/ 2 digital output, it will be able to report in EN 50160 standard, it will have IEC 61000- 4- 30 class A or Class S, All these data will be communicated to SCADA.The meter supports TCP/IP, HTTP,  SNTP, SNMP, SMTP and FTP protocols and can communicate at data speeds up to 100 Mbps through its  Ethernet communications port. The meter supports a single IP address between two 10/100Base-T Ethernet  ports. Instrument current transformers for protection equipment shall be installed.  Current transformers shall be of the wound primary or bar primary type according to the ratio required. Current  transformers shall be suitably rated and designed to carry out appropriate metering and protection functions as  indicated.  The rated load of current transformers shall not be less than the sum of loads of all relays, instruments and  related loads. The current transformers shall have a continuous thermal current capacity in accordance with the  current capacity of the relevant switchgear, and a short circuit capacity of the plant.  All available signals shall be provided for telemetry and wired to the PLC for remote control and monitoring.  8.5.5 Earthing system  The systems shall be designed according to below list;  Transformer/generator/  CHP operation grounding  Board, PLC  Grounding  Lightning Rod  Conductor  Operation  Grounding  CHP (if any)  grounding  ≤3 ohm  ≤1 ohm  ≤1 ohm  ≤ ohm  ≤5 ohm  ≤ ohm  ≤3 ohm  3333  ≤3 ohm  The avarage of all earth network shall be provided with an earthing system less than 1 ohm.  The earthing system shall be constructed of earth rods driven into the ground beneath, or as close as practicable  to the foundation of the transformers. An additional earthing connection between the earthing rods may be  installed in as a ring electrode if needed. When strips are used, they may be buried beneath the foundation or  laid in trenches at least at 1.5 m depth.  The rod electrodes shall be depth electrodes of copper with low carbon steel core not less than 1,5 meter length  and 20 mm in diameter in all earthing system.  Galvanize strip 30x3,5 mm will be used for building earthing system. The galvanize strip shall be connected  other buildings minimum by 50 mm$^{2 }$stranded copper wire. 8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc 