Installing a ceiling light fixture with multiple wires?

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Old 07-23-13, 08:16 AM
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Installing a ceiling light fixture with multiple wires?

Hi everyone,

I'm trying to instal a ceiling light fixture in my condo, but the wiring in the ceiling electrical box is very confusing. I expected to find one black wire, one white wire and the ground wire. However, what I found was a whole bundle of wires. Most visibly there were 3 black wires bundled together, 3 white wires bundled, a group of green wires bundled, as well as a red and a blue; and a whole bunch more tucked in the very back. Here is a photo of that electrical box:

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The ceiling fixture should be controlled by a switch on the wall. If it makes any difference there is another ceiling light near by in the hallway. The light I'm trying to instal only has one black, one white and one ground wire. The building is also fairly new (2 years) and the ceiling electrical box was previously just capped off, no lighting fixture was hanging there previously.

I'd appreciate any help on how to go about attaching this light fixture! Do I attach each wire to the bundle or to individual wires? If anyone can help out I'd really appreciate it! Thanks!
 
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Old 07-23-13, 08:50 AM
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I suspect your black from the fixture attaches to the red or blue. White to white, green to green or bare. Do you have anything like a meter or non-contact tester?
 
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Old 07-23-13, 09:00 AM
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I don't have a tester, but I could get one. If the black from the fixture attached to the red or blue, does the white from the fixture attach to the entire bundle of white or just to one?
 
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Old 07-23-13, 09:27 AM
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All the whites need to connect.
 
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Old 07-23-13, 10:20 AM
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I don't have a tester, but I could get one
A $8-$15 analog multimeter would be a good choice. A dgital meter unless it is a more expensive quality brand may give you misleading readouts due to induced voltages. The non contact voltages are even worse for giving false readings due to induced voltage. A test light is also okay for testing but can't due continuity tests which are sometimes need
 
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Old 07-23-13, 11:05 AM
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The ceiling fixture should be controlled by a switch on the wall.
Turn the circuit off at the breaker, pull the switch out far enough to see it, and tell us how it is wired. Having both a red and a blue wire available may mean that your ceiling outlet has been pre-wired for a fan/light combination fixture. The box should be rated for fan support if that's the case.
 
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