I have two black (hot) and two white (neutral) and a ground. One black is hot with breaker on and the other is not. What is the likely cause?
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1One is controlled by a wall switch? – Jimmy Fix-it Oct 31 '20 at 20:46
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1What prompted you to ask this question? Are you replacing a receptacle, and if so, are you replacing it with a GFCI? – ThreePhaseEel Oct 31 '20 at 20:47
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1This needs more detail. Are the 2 cables in the same box in the wall? Is this a switch, an outlet, or a fixture? – FreeMan Oct 31 '20 at 21:14
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2One brings power to the box the other is a traveler that once hooked up takes power to another outlet – Kris Oct 31 '20 at 21:24
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This question needs a lot more detail to answer properly. Is this a switch box? an outlet box? What is it you are trying to do? – George Anderson Nov 01 '20 at 00:28
1 Answers
The very fact that you separated them for testing is why one is not hot.
Circuits (coming off a breaker) power more than one outlet.
Hot and neutral enter the box on one cable. To get to the next outlet, they exit the box on another cable. Each wire has a black and white, and in most cases black=hot.
If you disconnet the two wires from each other, one will be connected to the breaker. The other will be disconnected from the breaker because you disconnected it.
It's common to use a receptacle itself as a splicing point. The recep has 2 screws that are connected to each other *and to the socket slots). The 2 screws can be used to splice 2 wires to each other (and the socket slots of course).
This doesn't always work, receptacles have "tabs".
If you don't like the idea of using a receptacle as a splice, then look up "pigtailing".
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