A bus bar is used in electrical power distribution device and refers to thick copper or aluminum strips that conduct electricity through an electric apparatus. This apparatus can include a switch board, substation or distribution board. The size of the bus bar is very important as it determines the maximum amount of current that can safely be carried through the system.
They are typically flat strips or hollow tubes that allow heat to dissipate more efficiently because of the cross-sectional area to high surface area ratio. These bus bars can be either connected to each other or to clamp connections
or any one of these electrical apparatuses. In a residential electrical panel, bus bars are installed on the interior of the electric panel at each side of the breakers and serve as the connection point for the neutral and ground wires. On a modern panel, neutral and grounds are separated on separate bus bars and no connection point has more than one wire on it.
The major types of bus bars are rigid bus bars (used at low, medium or high voltages), strain bus bars (used mostly at high voltages), sulfur hexafluoride-insulated bus bars (used in medium and high voltage systems) and insulated-phase bus bars (used in medium voltages).