S-2.1, r. 4 - Safety Code for the construction industry

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3.4.6. If the building is provided with a water supply system of at least 300 litres per minute under a minimum pressure of 80 kPa at the highest point, hoses equipped with nozzles may replace the portable water extinguishers. The minimum hose diameter shall be 19 mm and the nozzle shall be of the spray type with a minimum opening of 10 mm.
R.R.Q., 1981, c. S-2.1, r. 6, s. 3.4.6.