38 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  covers. When emergency stop button is pressed it will enable audible and visual warning which is present in  PLC board.  Emergency stop push buttons are required adjacent to every pump (except drain/sump pumps), motor valves  and valve actuators and at aerated tanks for stop of the blowers.  Emergency stop shall be housed in tough high visibility yellow enclosures with red mushroom button which  stand out well amongst other equipment and must be clearly labelled: "EMERGENCY STOP" (note the text  shall be in Turkish and English). The button shall stay in off position when activated and can only be brought  back to normal position, when reset.  Every emergency stop circuit shall be hardwired into the motor control circuit to ensure immediately  disconnection of the motor in every mode of control.  Important : The motor control circuit shall be designed  such that a tripped motor will not restart automatically when the emergency stop is reset. A stopped motor can  only re-enter service when the emergency button has been reset and after reset by hand via a door mounted push  button in the motor panel. Status of each emergency push button shall be signalled to the PLC as well as SCADA.  8.7.19 Labelling and marking  Text on labels shall be in the  Turkish  and English languages. Other languages will not be accepted.  All marking shall comply with the documentation for the assembly e.g. circuit diagrams and wiring diagram  etc.  Each assembly shall be provided with a label displaying the assembly's identification number, and describing  the function of the assembly. The height of text applied shall be minimum 10 mm.  Labels identifying each front of assembly mounted devices e.g. ammeter, selector switches, push buttons,  lamps, etc., shall be provided on the face of the assembly. Labels identifying and denoting the function of  apparatus and group of equipment located behind doors e.g. motor controller etc., must be placed on the  respective front door. The height of text applied shall be 4-5 mm.  All labels shall be with black engraved letters on white background. Only uppercase letters may be used.  Assemblies shall be fitted with a warning label, warning against electric shock. The warning label shall be  engraved to give black letters on a yellow background, and be preceded by the lightning flash symbol.  Labels shall be fixed with countersunk chromium plated or stainless steel screws. Self-adhesive labels will not  be accepted.  Internal labels designating components shall be fixed to non-removable equipment. Internal labels must be  visible and must not be obscured by assembly wiring, etc.  Labels on the face of assemblies shall be so placed that levers in any position do not cover them.  Each and every component or piece of equipment within assemblies must be tagged with an independent  reference number. Marking shall be executed by adhesive marks of plastic impregnated tissue.  Each internal wire shall be identified pursuant to circuit diagrams by means of ring type plastic makers at both  ends, placed on the wire before termination.  Terminals for connection of power cables shall be marked with phase nomination and group number. Terminals  for connection of control and instrument cables shall be numbered.  8.8 Instrumentation  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc 