Electronic – Figuring out ground in AC circuit

accablesschematicswiring

I'm currently trying to change my lamp in my bathroom so I disconnected my current lamp and forgot to write down what the cables were attached to.

There are 3 cables coming out from the ceiling.

-----------------------
      /  |  \
     /   |   \
    /    |    \
   /     |     \
Brown   Blue   Black

Between Brown + Black I get voltage.

Between Brown + Blue I get voltage.

Between Blue + Black I get no voltage.

How can I tell which of these cables are ground (AC 230V)?

Is there any way of measuring resistance/current/voltage to tell what is ground here?

Please let me know if I can provide any more information.

I'm from Sweden, usually ground is green-yellow here.

There are two lamps connected to the dimmer so the circuit is split somewhere in the wall.

I ended up connecting blue to neutral and brown to live. Works like a charm.
Read Winny's comment below for more detailed information.

Best Answer

Here is my guess:

3-wire lamps

The type of each cable can be easily determined using a voltage tester (neon lamp) and voltmeter as follows:

  • First find out the live wire(s) by touching it by the voltage tester.

  • Then connect the one probe of a voltmeter to the live wire and find out the neutral wire by connecting the other probe to wires. If there is voltage, the wire under test is the neutral wire (ground).

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