This is essentially a single bus scheme with bus section breaker and an extra bus coupler breaker with bypass disconnect switch facilities. In Simple words, a bus-bar is a common connection point or a node for multiple incoming and outgoing circuits such as power lines or feeders. This arrangement is the simplest, but provides the least amount of system reliability. Bus faults or failure of circuit breakers to operate under fault conditions. Electrical Bus System Definition: An electrical bus system is a setup of electrical conductors that allows for efficient power distribution and management within a substation. Because it is cheap and simple. To permit for all operating and maintenance conditions, all. Category 2 – Short outage necessary to transfer the load to an alternative circuit for maintenance or fault conditions; e.