(1) Except as provided in Sentences (2) and (3), the fire alarm system in the main school building shall be extended to the portable classrooms with a separate zone indicator on the annunciator.
(2) The requirements in Sentence (1) need not be provided where there are not more than 12 portables on a site and where,
(a) Reserved
(b) the distance between portable classrooms is less than 6 m and the requirements of Subsection 3.2.3. are applied between the classrooms, or
(c) the portable classrooms are in groups where,
(i) the distance between the classrooms is less than 6 m,
(ii) the number of classrooms in a group does not exceed six,
(iii) within a group of classrooms, the facing walls have a fire-resistance rating of 45 min, rated from inside the classroom, and
(iv) the distance between groups of classrooms is 12 m or more.
(3) The requirements in Sentence (1) need not be provided where the distance between portable classrooms is 6 m or more.