Incomer breaker panel at bus bar

A very specific and technical question!

An "incomer breaker panel" is a type of electrical panel that is designed to receive incoming power from a utility company or a generator, and then distribute it to various parts of a building or facility. The panel typically contains a bus bar, which is a metal bar that carries electrical current and provides a common connection point for multiple circuits.

Here's a breakdown of the components you might find in an incomer breaker panel at a bus bar:

  1. Bus bar: A metal bar that carries electrical current and provides a common connection point for multiple circuits. The bus bar is usually made of copper or aluminum and is designed to withstand high currents and voltages.
  2. Incomer breakers: These are the main circuit breakers that receive incoming power from the utility company or generator. They are typically larger and more robust than regular circuit breakers, and are designed to handle higher currents and voltages.
  3. Main lug: This is a connection point on the bus bar where the incomer breakers are attached. The main lug is usually a bolted or screwed connection that provides a secure and reliable connection to the bus bar.
  4. Circuit breakers: These are the smaller circuit breakers that are connected to the bus bar and provide overcurrent protection for individual circuits. They are usually smaller and less robust than incomer breakers, but still provide reliable protection against overcurrents and short circuits.
  5. Fuses: Some incomer breaker panels may also include fuses, which are designed to provide overcurrent protection for specific circuits or equipment.
  6. Grounding bus: This is a separate bus bar that provides a common grounding point for all the circuits in the panel. The grounding bus is usually connected to the main bus bar and provides a safe path to ground for fault currents.

Overall, an incomer breaker panel at a bus bar is a critical component of a building's electrical system, providing a safe and reliable way to distribute power to various parts of the facility.