What is the minimum on-premise fuel supply required for internal combustion engines used as prime motors?

The minimum on-premise fuel supply required for internal combustion engines used as prime motors is established to ensure that the engine can operate reliably during power outages or emergencies. A supply of six hours is typically set to provide adequate time for the engine to run without interruption, allowing for maintenance considerations and potential delays in refueling. This standard ensures that the power source can reliably support the load it is intended to serve during times of need, such as during an outage.

Setting the requirement to six hours strikes a balance between ensuring sufficient operational time and managing logistical concerns related to fuel storage and safety. By having this minimum on-site fuel quantity, facilities can enhance their resilience against prolonged power disruptions, making six hours an essential standard in safety and operational guidelines.