House was built in the early to mid 60's, Two story twin in NE Philadelphia. I opened up the walls and ceiling in the three bedrooms upstairs to add insulation, swap out outlets and switches, and installed ceiling fans. I will be the first to admit electricity is NOT my best friend.
I purchased a Klein non contact electrical tester, (red and beeping = hot, solid green = dead). I turn on all the lights in the dining room and kitchen and proceed to turn off circuit breakers until the lights go out. I take the tester to the four wires/cables that I know run the kitchen and dining room. One side of the cables/wires is red and beeping and the other side is green?! I turn the breakers back on and test the cables/wires again and get the same results only opposite sides?
From what I have read and remember from HS shop class if you KILL the breaker you are suppose to KILL the power? Am I missing something? Using the tester wrong? Or am I a complete IDIOT?
Most likely residual Voltage. Like someone else mentioned. Those meters are not that good for troubleshooting