If you have a multimeter, you do a continuity test to find the which of the three (I assume) wires is connected to the metal casing of the chandelier. The other pair (Live and Neutral) do not matter which way around they are (for a light this is true).
If you do not have access to a multimeter or do not understand what I am talking about, then refer to a handiperson to help you - do not guess.
It is very important that the metal case of a chandelier is properly earthed.