in US wiring is color coded: white is neutral, black is phase (hot), green is ground. On the cord there are two flat prongs one is larger and one is smaller and a semi-round prong. Cut the plug off the cord, note which wire is connected to which prong. Larger flat prong is neutral, smaller is phase, semi-round is ground. Connect accordingly to your power entry module. When the switch is off you want the hot wire to be interrupted, this is why it is important to notice how it is connected before cutting it off. Hope this helps.