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A customer recently called me and said she attempted to change out a light switch and after she did she turned the power back on she got a large flash and blew a fuse. When I got there the switch box had three conductors in it and the switch was a switch and receptical combo, switch on top and receptical on bottom. The switch controled a ceiling fan. I located the hot wire and then proceeded to do a continuity test to locate the neutral. The system had no ground wire. When I did the continuity test I got continuity between all all three wires. Can any one help me figure out why?

This was old wire and all that was visible in the box was three conductors I didn't see any wire sheathing only what was on the individual wires.

I eventually got the light working but still don't know why I had continuity on all three wires.

Thank you!
 

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