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Engine Batteries – Section 11.2.7.2.1

In a diesel engine-drive configuration, the batteries provide the cranking power to the starter on receiving notification from the fire pump controller. In addition, the batteries provide backup power for the controller if the primary (or secondary) power supply fails.

11.2.7.2 Electric Starting. Where electric starting is used, the electric starting device shall take current from a storage battery(ies).

11.2.7.2.1.1 Each engine shall be provided with two storage battery units: battery unit A and battery unit B.

11.2.7.2.1.2* Flooded lead-acid batteries shall be furnished in a moist or dry charge condition with electrolyte liquid in a separate container. Valve-regulated lead-acid (VRLA) batteries shall be furnished in a completed, charged condition.

11.2.7.2.1.3 Nickel-cadmium or other kinds of batteries shall be permitted to be installed in lieu of lead-acid batteries, provided they meet the engine manufacturer’s requirements and the charging voltage levels of the chargers in 11.2.7.2.5.3 are coordinated to meet the requirements of the specific batteries.

Δ 11.2.7.2.1.4* At 40°F (4°C), battery unit A shall have the capacity sufficient to maintain the cranking speed recommended by the engine manufacturer, during six consecutive cycles of 15 seconds of cranking and 15 seconds of rest.

N 11.2.7.2.1.5 At 40°F (4°C), battery unit B shall have the capacity sufficient to maintain the cranking speed recommended by the engine manufacturer, during six consecutive cycles of 15 seconds of cranking and 15 seconds of rest.

11.2.7.2.1.6* Battery unit A and battery unit B, combined, shall be sized, based on calculations, to have capacity to carry the loads defined in 11.2.7.2.3 for 72 hours of standby power followed by six consecutive cycles of 15 seconds of cranking and 15 seconds of rest, without ac power being available for battery charging.

11.2.7.2.4* Battery Location.

11.2.7.2.4.1 Storage batteries shall be rack supported above the floor, secured against displacement, and located where they will not be subject to excessive temperature, vibration, mechanical injury, or flooding with water.