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National Building Regulations
Part W. Fire Installation

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W3. Design of Fire Installations

In any fire installation -

adequate and suitable connection and means of measuring water pressure shall be provided;
so many isolating valves shall be provided to control the flow of water to the installation, and to such points within the installation, as the local authority may require; and
the quantity, pressure and rate of flow of water shall be adequate for the supply of any hose reel, hydrant or sprinkler system connected thereto.