37 of 124  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 08: Electrical Works  8.7.18 Control panels for local functions  8.7.18.1 Local Pad-lockable Stop Switch  8.7.18.2 Emergency Stops:  8_Vol3_d4 3_Section 8 electrical works_en_GIR rev6.doc  Emergency stop which will be operated with Category 4 24 VDC emergency safety relay will be placed for  groups belonging to those areas. It will not reset from SCADA or PLC. Operator will reset manually from board  cover when emergency disappears. Emergency stop relay will switch off all control voltages for relevant group.  Emergency stop which is present in PLC board cover, will switch off all control voltages for relevant MCC.  There will be group emergency stop areas warning light/emergency stop reset illuminated pushbutton in board  Emergency stop button is present in local control box for each motor and they will stop relevant motor.  In general emergency stop for emergency shutdown is mandatory for any machinery, which can expose  personnel to risk of injury during normal operation.  Status of each safety switch shall be signalled to the PLC as well as SCADA. The switch shall be installed in the power circuit for the motor and all phases shall be disconnected in the OFF  position.  The switch shall include the following positions/functions:  A local stop switch shall be installed adjacent to each machine (motor). The stop position shall be pad-lockable,  and it shall be impossible to start the machine when locked. The switch shall be capable of disconnecting the  full load current. For motors with a nominal current above 180 A, the safety switch facility shall be provided by  means of the motor circuit breaker.  Monitoring of the motors running and faults shall be included in the control and monitoring system.  The material of local control panel shall be preferred as hot dip galvanized material, stainless steel material at  least AISI 304 quality or thermoplastic material. Supports of the panel shall be made as hot dip galvanized or  stainless steel (heavy duty type).  There will be load disconnector (except motors with frequency converter) IP65 LED illuminated start/running  (green) and stop/failure(red) integrate push buttons.  The panel shall automatically control the operation of the installations. "Auto-O-Manuel" selectors shall be  available locally.  Outdoor local control panels will have IP 65 protection and double cover and capped. First over will be UV film  coated or will have filtered glass and there will be control buttons or switches over 2$^{nd}$ cover. It will be designed  such that dust or liquid will not enter through 2$^{nd}$ cover. Emergency button will be present at right hand side  over 1$^{st}$ cover.  Local functions can be designed as stand-alone units with possibility of local manual operation.  The contractor shall supply detailed electric schemes with the composition of the cabinet.  The cabinet shall be equipped with protection/general differential and thermal switches for power supply,  sensors and each element liable to overvoltage.  All available signals shall be provided via etherhet/BUS communication to the PLC for remote control and  monitoring.  O :  Stop, pad-lockable, power supply is cut-off  I :  Automatic, control from panel. 