A ring-bus architecture is often used in high-power ships.
It has four generators connected in parallel in a ring bus configuration and no emergency generator.
Ship without emergency generator
The four generator buses along with the four bus-ties form
a square-shaped ring. Such an architecture without an emergency generator is possible when multiple generators are connected in parallel by a bus-tie in a way that any one can be out for service with the remaining generators supplying the total load.
The physical locations of the generators and switchboards are generally in different fire zones, watertight compartments, and on different decks, providing the redundant power distribution system with separation.