ELECTRICAL WIRING: PCS Power breaker switch: Ensures that the power used does not exceed the maximun power that the customer had contracted. Main breaker switch: Protects the wiring from short circuits. ELCB Earth leakage circuit breaker: Security device that disconnects the wiring if someone gets an electric shock or there is a current leakage. MCB Miniature circuit breaker: Protects against overloads and short circuits and allows disconnect independently differect sections. HEATING SYST: Depending on the number of users: District heating: Thermal power station is located in a separate building and network is shared by many users. Central heating: The heat source is shared by a whole building or block of flats. Individual heating: Each home has its own heat source and hot water plumbing system.