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I have a new halogen light to replace the old bathroom light?

My new halogen bathroom light set (a gluster of 3) has a Live Neutral and earth wires. However the old bathroom light has 3 black wires 2 of which are wired together into one side of the fitting and one wired on oits own into the other side. How do I know what wire goes where?
Gary Hawker, August 2010
The two blacks together are neutral - the single black on its own is Switched Live - to turn the light on and off.

For a controlled & switched 230V you wire lamps across the two blacks and the single black.

The lights do not connect to the red wires.

Peccavi, August 2010