(D) Capacity of Systems
Feeders shall be sized in accordance with 215.2 and Part III of Article 220. The alternate power source(s) required in 517.30 shall have the capacity and rating to meet the demand produced by the load at any given time.
Demand calculations for sizing of the alternate power source(s) shall be based on any of the following:
- Prudent demand factors and historical data
- Connected load
- Feeder calculation procedures described in Article 220
- Any combination of the above