Residual water pressure at the design flow rate at the topmost hose connection of a standpipe system that is required to be installed in a building where:

• the building is sprinklered throughout,
• the water supply at the base of the sprinkler riser is capable of meeting, without a fire pump, the design flow rate and pressure demand of the sprinkler system, including the inside and outside hose allowance, and
• fire protection equipment is available to deliver, by means of the fire department connection, the full demand flow rate at a residual water pressure of 690 kPa at the topmost hose connection of the standpipe system.

This applies to buildings described in Sentence 1.3.3.2.(1) of Division A in which standpipe systems are installed.

This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Sentence 9.10.1.2.(8).

To exempt a standpipe system from the pressure requirements of the standard referenced in Sentence 3.2.5.9.(1) with respect to the need to install a fire pump in a fully sprinklered building solely to develop the pressure requirements of the standpipe system, if there is sufficient water pressure and quantity from the municipal water connection to satisfy the sprinkler system demand. This is to limit the probability that a fire will not be suppressed or controlled, which could lead to the spread of fire, which could lead to harm to persons.