Emergency switchboard

• During the main power failure the switch board which provides the emergency load that supplied from emergency generator.
• Switch board has two sections , 440v and 220v.
• In normal conditions, the 440v supply is taken from E/R main switchboard, through a circuit breaker.
• The circuit breaker trips(open), when there is loss of power. 
• Immediately Power is supplied from emergency generator through another circuit breaker.
• To prevent simultaneous closing of both breaker (both emergency and main generator may be running, simultaneously) , an interlock is provided.