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The Plug I am using isAre you talking about a mains power socket and plug?
Bob
Tell us what your trying to do, and why you need verify the plug is attached.
Perhaps the current can be detected by a ct downstream?
Also curious about where your located to better understand voltage configuration.
Can you check for continuity between NEUTRAL and GROUND in the plug? Should be continuity when plug is mated to receptacle, no continuity when plug is disconnected from receptacle.
You keep alternating your use of "plug" and "socket". From your OP, the blue female connector is a PLUG and the yellow male connector is a SOCKET. Presumably, the PLUG will be energized by a contactor eventually. However, whether the contactor is energized (closed) or not, there should always be continuity between the NEUTRAL and GROUND in the blue PLUG. Presumably, the yellow SOCKET is the equipment to be powered by the blue PLUG. There should be no continuity between the yellow SOCKET NEUTRAL and GROUND connections if it is wired properly to the equipment. This is what I was suggesting that you measure, but if those terminals are not accessible then Plan B is necessary.Thank you. Will check. Can you explain why there would be continuity between neutral and ground when plug is connected to the socket ? If I am not wrong, wont there already be continuity between neutral and ground coming from main power supply in USA ?
Is there any way of detecting whether plug is connected to socket on the socket side (Blue socket, pic posted above) . Because it will be difficult to access the plug (yellow one in pic above) in my application
The way it is connected now that the blue socket in picture above (female) is connected to the mains power supply. One pin is connected to neutral, another to ground, and the other two to two in phase 120v lines. The yellow plug is connected internally to 120volt equipments
USA. Need to turn on power supply to my device only after plug is detected inside the socket.