Assumptions for space separation calculations

The assumptions for establishing space separation are – (a) that the fire will involve a complete compartment but will not spread to other compartments; (b) that the intensity of a fire is related to the use of the building and will be moderated by a sprinkler system where it is provided; (c) that a building, which has an identical elevation, is located on the opposite side of, and at the same distance from, the relevant boundary; and (d) that radiation from that part of the external wall, which has the fire resistance required by Section 4, is discounted unless its external surface is combustible as described in paragraph 5.10.