380V electric heating tube, * * * three, each with two terminals, there are two connections.

Three tubes and six terminals. First, connect one end of the three tubes together, that is, the 2. end, and then connect three live wires with an electric heating tube, that is, the 1. end.

The other is that the electric heating tubes are W,U,V, 1. and 2. They are connected according to the connection method in the drawing, and then the three live wires are connected to 1. respectively.