On the wiring of the card insertion device of the hotel energy-saving switch!

I have a plug-in card, that is, the kind that plugs in the card to get electricity, and there are only two connecting wires (you said that the plug-in card only has two connecting wires! ), measured with electric pen, live wire and zero line, but there are four connectors on the card inserter (the four connectors you mentioned). What should I do? How to connect four connectors with only two wires? Ask you! How many terminals are there on the card inserter?

What you said about "measuring with electric pen, live wire and zero line" is uncertain! Because if you measure two wires in the switch box with an electric pen, one is red and the other is not red! But what is not red is not the zero line, but the "crossing line" to the lamp holder.

The easiest way is to try a string of light bulbs. If the light bulb lights normally, it means one fire and one zero, otherwise it is not!

I am a hotel maintenance electrician. I often repair this thing. I'll add a few questions and explain them clearly before I elaborate.