The cabin control board set consists of (the main control board is located in the control panel in a machine room - the cabin card and is located at the top of the cabin - an electrical transformer input 220 volts and an output of 12 volts - a capacity of 3 amps to feed the cabin card and the other of the cabin signals)  

The duplex group is installed in 2 adjoining elevators common to external requests (one button for external requests for both elevators). The internal requests are separate for each elevator