Automatic transfer switching shall be applied inside the MDP. 

1 pcs emergency stop button shall be placed inside the LV panel room and it is capable of cutting the energy off entirely. 

## 8.7.12 Earth leakage circuit breakers 

Earth leakage circuit breakers (ELCB) for supply of final sub-circuits shall generally comply with the sub- section above. 

Earth leakage protection shall be adopted in every branch circuit with socket outlets. Earth leakage protection 

shall be 30 mA in plugs and 300 mA in panel power supply. MCC main circuit breaker inlets shall be 4 poled and there shall be 300 mA residual current. 

There will be residual circuit breaker which can be mounted over thermal/magnetic circuit breaker up to 800 A. There will be separate residual current circuit breaker and toroid current transformer for circuit breakers greater than 800 A. Time delay can be adjustable up to 4,5 seconds. 

Diesel Generator and CHP circuit breaker will be 4 poled and there will be residual current circuit breaker. 

30 mA-30A toroid current transformer Residual current circuit breaker with 0-4,5 seconds delay will be installed at transformer outlet circuit breaker, generator outlet circuit breaker, CHP outlet circuit breaker, MCC main inlet circuit breaker. 

Serial residual current circuit breaker will be used in secondary board main inlet circuit breaker, outdoor lighting board inlet circuit breaker. 

## 8.7.13 Isolating switches 

Isolating switches shall be adopted as bus-coupling switches and as incoming breakers in down stream assemblies if they are protected by a source circuit breaker. 

Isolation switches must be four pole and have characteristics commensurate with the assembly duty, and as a minimum be rated at a voltage of 500 V and of a load break capacity in excess of the total load of the assembly. 

The switch is to generally comply with EN 60947 and be provided with an operating handle, interlocked with the compartment door, lockable in the on and off positions. 

Excluding connection between frequency converter(outlet) and motor. 

There will be lockable isolation switch with extension lever up to cover at panelside for all motor power supply. Position of isolation switch will be delivered to PLC. Panel cover will not be opened before bringing Isolation switch to OFF (0) position and without switching off compartment where isolation switch supplies power. 

There will be isolation switch for actuators (motorized triphase valves). 

## 8.7.14 Motor controllers 

Each electric motor must have its associated control and protection equipment located within compartments of the assembly complying to form 3b. All motor control gear must be in accordance with EN 60947. 

Motor controllers are to be designed in accordance with the manufacturers' recommendations for the motor type, characteristics, size and duty. Facilities for padlocking in on/off positions are to be provided as well as extended operating handle for front of assembly operation. 

Contactors and relays must be chosen to ensure that under normal operation the contact's life will exceed 5 years, and that, irrespective of actual usage, all motors starters are to have a category of frequent duty. 

