Why is my electrical fixture throwing my breaker?

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  #1  
Old 01-20-17, 12:28 PM
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Why is my electrical fixture throwing my breaker?

I have two leads coming from the wall, two white and two black. I have joined the whites and blacks together. I connected a new fixture by connecting the one black wire and the one white wire to the supply in wires. When I turn on breaker the light comes on in the "off" position. When I move the switch to "on" position the breaker pops. What gives here? Thanks in advance
 
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Old 01-20-17, 12:33 PM
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Wires vs. Cables

Single conductors are wires. Multiple conductors enclosed in a sheath make up a cable.

Post photos of the cables and wires in the switch box and in the ceiling box.
 
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Old 01-20-17, 12:35 PM
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You have a switch loop between the fixture box and the switch. I can explain more if you prove you are not a one-post wonder.
 
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Old 01-20-17, 04:19 PM
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Do you own a volt meter?you must first identify the cable coming up from the switch,the white wire from there must now be reidentified,any color but white or green,post back when you have done this.
Geo
 
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Old 01-20-17, 06:54 PM
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You have created a dead short between the neutral and a hot. You will need to correct your splices to remove the short.
 
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Old 01-20-17, 07:31 PM
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This seems to be what you have. This is the correct way to connect the wires. You should use a multimeter to determine which cable is power in. A non contact tester won't work but you can also determine which cable is hot by connecting the black and white of one cable to the light. If the light works that is your power in cable. If the light doesn't work that is probably your switch cable. Confirm by connecting the light to the other cable to test it.

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Old 01-20-17, 08:50 PM
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I'll give the OP a full 24 hours but I suspect I was correct in her being a one-post wonder.
 
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