5.—(1) Subject to sub-paragraph (2), there shall not be a lateral opening in means of protection save at a point of access to a ladder or stairway where an opening is necessary.
(2) Means of protection shall be removed only for the time and to the extent necessary to gain access or egress or for the performance of a particular task and shall be replaced as soon as practicable.
(3) The task shall not be performed while means of protection are removed unless effective compensatory safety measures are in place.