Frequency of draining and refilling with fresh fuel of liquid fuel storage tanks that supply fuel to emergency power systems.

This applies to emergency power systems in buildings that are used to supply emergency power to fire alarm systems, voice communication systems in high buildings, fans and other electrical equipment installed to maintain air quality and venting in high buildings, elevators in high buildings, water supply for firefighting, smoke management systems in interconnected floor spaces and emergency lighting systems

This also applies to internal combustion engines used to power supplementary blowers required by the National Building Code of Canada in tents and air-supported structures, as stated in Sentence 2.9.3.6.(1).

To limit the probability of degeneration of, or impurity buildup in, the liquid fuel, which could lead to emergency power systems not operating as originally intended when there is a loss of normal power in a fire situation, which could lead to the inability of the emergency power systems to supply fire protection systems, which could lead to the inability of:

• sprinkler, standpipe and hose systems, and other fire suppression systems [that rely on booster or fire pumps, or electrical power] to control or suppress a fire, which could lead to the spread of fire, and
• smoke management systems to control smoke conditions as originally intended, which could lead to the migration of smoke from one floor area or fire compartment to other parts of the building.

This is to limit the probability of damage to the building.

To supersede the requirements of Sentence 6.5.1.1.(1).