Since public facilities, buildings, factories, etc. consuming a lot of electricity, it must be supplied from high-voltage lines of the electric power company. This requires equipment to receive high-voltage currents, and at the same time, necessary to equipped with both high/low-voltage for distribution to these facilities.

Electrical systems of various electric power companies are connected to all electric power consumers, from commercial customers to households, forming a network. Protecting this network from customers’ electric accidents requires power distribution panels.