I am trying to cut the power to an outlet and tried turning off by elimination each 15/20 amp circuit and the power remains on. Any ideas?
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If you only have one electrical panel (could you have a subpanel feeding this outlet?) and you have tried killing power on each circuit (I assume you checked the single pole breakers), and you are not generating electricity, then my guess is that a 240 volt circuit is feeding this outlet.
Another question is how did you check the circuit? A plug in tester is good, but even simpler is to have a load, such as a lamp, on the circuit. A digital multimeter will sometimes indicate voltage when no load is present.
Each leg of a 240 volt breaker carries 120 volt measured to the neutral and 240 volts measured to the other leg. It is possible that your receptacle is fed from a double pole breaker.
Power is being back fed. Connection have to be disconnected and traced to see where the back feed is coming from
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