Lighting Transformers are designed to supply power to lighting equipment in a commercial / industrial / domestic unit. It’s primary supply connected to higher voltage source and secondary is to be connected to load. Lighting transformers serves as isolation between primary and secondary, it also restricts any high voltage spikes and EMF coming with the raw mains incoming power. It also restricts short circuit current in the load and saves major accidents. It is also used where incoming supply is 3 phase 3 wire and lighting load is 220 Volt single phase.