I wish to connect a light bulb connection (2 wire connection) to the ceiling but there are 3 wires:
1) Yellow/Green, 2) Blue, 3)Black
I live in Germany, which two wires do I connect ?
Electrical – Light bulb connection to the ceiling
electrical
Related Solutions
Often, electricians used ordinary black/red/green twin&earth for C but marked the black wire with red tape (to indicate "switched live")
You seem to have something nonstandard, perhaps a spur (therefore missing B) without an earth to the switch? You'll have to use appropriate methods to determine what is what.
See answer to similar old question https://diy.stackexchange.com/a/32251/2815
Look at the switches that control the fan/light... What color wires are connected to them? How was the previous fixture connected? Why didn't you simply connect the new device in the exact same manner?
If the fan and light used to be controlled independently by separate switches, I'd assume the previous wiring used the green wire as an ungrounded (hot) conductor. This would be confirmed by seeing the black wire connected to one of the switches, and the green connected to the other. This is an uncommon use of the green wire, and as you've found can be confusing. If this is the case, you should mark the wire in some way to indicate that it is not a grounding conductor.
If you've confirmed that the green wire is indeed used as an ungrounded (hot) conductor, then the wiring will be as follows.
- Black from ceiling to black from fixture.
- White from ceiling to white from fixture.
- Bare copper from the ceiling to green/yellow from fixture.
- Green from ceiling to blue from fixture.
If the green wire is not used as an ungrounded (hot) conductor, contact a local licensed Electrician and have them install the fixture.
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Best Answer
Who knows? Europe is in the middle of harmonizing their wiring standards. There's a lot of old and new work out there.
In one of several old standards, black is neutral. The new standard is blue for neutral. What you know for sure is that green is ground. The other two are hot and neutral. If your lamp doesn't care, that may be enough.
If it does care, measure voltage between one of the wires and ground. The hot will be around 230V to ground. The neutral will be 0-2 volts.