(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)
the distance between portable classrooms is less than 6 m and the requirements of Subsection 3.2.3. are applied between the classrooms, or
(b)
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.