Wiring
On a 230/240 volt system the red and black will be current carying conductors on a 4 wire system. Each will be connected to a phase on the distribution panel. The white is a neutral connection designed to carry unbalanced current. The green is the equipment ground, of safety ground. You should not experience electrical shock on the white conductor once it is connected. The only way to be shocked by the white conductor would to be in series with it, making yourself the path for current flow as is the wire. A three wire will use white and black as the load wires and the green will be a neutral/ground combo.
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