Spot network substation

Spot networks are considered the most reliable and most flexible arrangement of connecting power to all types of loads.

In large cities, many electric utility companies use grid feeders to make interconnected distribution networks to serve the downtown core.

These substations may consist of two to eight or more primary transformers connected to the same secondary bus to provide reliable facility power.

Examples of such single facilities include airports, hospitals, major data processing centers (especially those using uninterruptible power supplies), and sports arenas that regularly broadcast nationally televised events.

St. Jude Children's Research Hospital in Memphis, Tennessee has eight primary transformers that are connected to the same secondary bus.

The Toronto Pearson International Airport is electrically fed by four grid feeders, each capable of carrying the entire 20+ MW load.