Busbar Trunking System is the is a system of distributing electric power using copper or aluminium busbar with suitable enclosures and good amount of protection to prevent the cables from getting damaged due to foreign bodies. Busbars are now becoming irreplaceable simply because of the convenience and safety factor.
Busbars are metal bars used to carry large amounts of current. Often made of copper or aluminum, every home electrical panel has busbars to distribute ac power to the rows of circuit breakers. Quite often, busbars have no insulation—they're protected by a separate enclosure.