52 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  Transformer/generator/CHP  Operation grounding  Panel, /PLC  grounding  Lighting  conductor  grounding  Operation  grounding  CHP grounding  ≤3 ohm  ≤1 ohm  ≤5 ohm  ≤3 ohm  ≤3 ohm  8.9.7 Lightning and Overvoltage Protection  8.9.7.1 External Lightning Protection  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc  At inlet of main  distribution board  At  MCC  board  inlets  At  /PLC  board  inlets  Local equipment boards  (grating  stripper,  fire  decanter, UV…etc)  Type 1 , B Class  Type 2, C Class  Type 3, D Class  MCC part; Type 2, C  class  If  there  is  /PLC  or  controller Type 3 , D  class  8.9.7.2 Internal Lightning Protection  The heart of the internal lightning protection system is the equipotential bonding system to be established. All  from field incoming and outgoing to field signal and control lines shall indirectly be incorporated in lightning  protection equipotential bonding system via lightning and overvoltage arresters.  The earthing system for external lightning protection shall be connected to the building reinforcement. All the buildings, of which people work inside, shall be protected via Faraday Cage against the lightning. Other  units except buildings shall be protected by active interception rods. Protection shall be included all Plant. Transformer/generator/CHP  Operation grounding  Panel, PLC  grounding  Lighting  conductor  grounding  Operation  grounding  CHP grounding  ≤3 ohm  ≤1 ohm  ≤5 ohm  ≤3 ohm  ≤3 ohm  The lightning protection system to be adopted shall be performed according to the protection class I  requirement of IEC  62305-1 , Protection of structures against lightning. All devices to be installed outside the building for intercepting and discharging the lightning current to earth are  described in DIN VDE 0185.  An external lightning protection system of buildings shall be established to prevent damage to the building due  to fire or mechanical destruction in the event of a lightning strike. 