Abstract: Electrical node (1) for forming daisy-chain buses with simultaneous serial data transmission and power transmission, comprising three connectors for a multipolar cable. The first connector comprises two contacts for input transmission of power and a contact for unidirectional serial input data transmission. The second connector comprises two contacts for output transmission of power and a contact for unidirectional serial output data transmission. The third connector comprises two contacts for power supply to a point of use; they are electrically connected to the two power contacts of the second connector by a switch. The node also comprises a device that reads a frame from the data contact of the first connector, and closes the switch for a duration depending on a value read from the frame.