Modular arrangement of components of electrical equipment enclosure

A method and an arrangement of components in a switchgear enclosure having multi-phase electrical power run-in and run-back bus bars. The circuit breaker is also provided in the enclosure. The arrangement of components is configured to provide interchangeable modularity of components within the enclosure. The arrangement of components includes a run-in mounting base including a primary disconnect member for each electrical phase. A run-back mounting base, including a primary disconnect member for each electrical phase is also included. The run-in mounting base and the run-back mounting base are configured to interchange the line and load side of the circuit breaker. Another embodiment of the arrangement includes a bridge coupled to one of the run-in mounting base and run-back mounting base, with the bridge configured to position each primary disconnect member for alignment with the circuit breaker. 136