How To Wire Lights in Series? Basic Electrical Wiring How To Wire Lights in Series? In above fig, all the three light points are connected in series. Each lamp is connected to the next one i.e. the L (Line also known as live or phase) is connected to the first lamp and other lamps are connected through middle wire and the last one wire as N (Neutral) connected to the supply voltage then. Wiring Lights in Series : Electrical Online Wiring lights in series results in the supply or source voltage being divided up among all the connected lights with the total voltage across the entire circuit being equal to the supply voltage. For many reasons, in practice this type of series connection is not done.