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I have an old house with a fuse box on the second floor of the home, and 200A service with breaker box in the basement. The fuse box is fed by a 30A line. The fuse box has 24 fuses and seems to integrate with much of the house.

Today I traced my living room electric with a circuit breaker finder to the fuse box. I unscrewed the fuse and the expected outlets lost power. However, when I passed these outlets and their plugged in items with a noncontact voltage tester, I got the same positive readings one does when the fuse is plugged in. Any ideas on what could cause this?

  • this is not the jog and an non-contact tester. You are out of the scope of a non-contact tester. You need something more reliable. – Paul Logan Nov 25 '17 at 2:03
  • I don't understand. What is more reliable? – sorrell Nov 25 '17 at 2:04
  • When you have the "fuse" removed but the non-contact tester shows a response, will the receptacle power a lamp? – Jim Stewart Nov 25 '17 at 2:06
  • @JimStewart no, it will not power a lamp but the cord shows voltage through the noncontact. – sorrell Nov 25 '17 at 2:10
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    @sorrell -- see if you get voltage from live to neutral at the outlet with the fuse removed – ThreePhaseEel Nov 25 '17 at 2:57
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A low impedance solenoid style or lamp style tester is the best tester for this type of troubleshooting. If the circuit can't power a solenoid than you are dealing with an induced voltage.

Good luck!

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