Load testing your work

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Short.Circuit

Short.Circuit

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I got bit in the *ss, by making an assumption. Customer wanted
a couple outlets in the basement of old house. Found a j-box in the
ceiling nearby, meter shows 120V, sweet. Jumper down to 2 plugs.
Plug tester shows everything is cool. Get callback, power tools run
1/2 speed. Meter shows 70V when drill is turned on.
Loose connection somewhere in the circuit I tied into,
god knows where. I'll be more careful in future. rats
 
its generally a good idea to find out what is on a circuit before tapping it, and knowing what that circuit may be loaded to at any given time.
 
And to make sure you haven't grabbed a switch loop, placing your new load in series with an existing one.
 
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