3.9.19. Mobile scaffolding: Any mobile scaffolding shall:
(a) be equipped with a braking device which prevents the scaffolding from moving;
(b) have the brakes applied when it is being used;
(c) be rigid and stable; and
(d) not be moved when a workman is on it, unless:
i. he is advised of the move;
ii. the smallest dimension of the base of the scaffolding is at least equal to 1/3 its height.