need electricians assistance, GVRD [bby]

[davefrombc]

It depends on the fixture but normally the colours coming from a unit are black , white and green. If you are tripping a GFI, I suspect you have the neutral wire ( normally white and to the silver screw on a plug or socket ) and the safety ground ( normally green , but may be a bare wire in some fixtures with wires meant to go to a box rather than an extension cord) switched. Power wire goes to the bronze screw in a plug or socket on an extension cord or wall socket .