138(1)An employer shall ensure that a ladder-jack scaffold
(a)
is not more than 5 m in height,
(b)
has supporting ladders properly secured against displacement,
(c)
is used only for operations where the work period between changes of scaffold position is of short duration and the load on the scaffold does not exceed 1.2 kPa, and
(d)
is not used by more than two employees at any one time.
138(2)An employer shall ensure that a ladder-jack assembly is securely fastened to the ladder so that it bears on the side rails.
138(3)Where a manufactured platform is used on a ladder-jack scaffold, an employer shall ensure that the platform is a minimum of 500 mm in width and is supported at intervals not exceeding 3 m.