(1) Except as provided in Sentence (2), every surface to which access is provided, including but not limited to flights, ramps, exterior landings, porches, balconies, mezzanines, galleries and raised walkways, shall be protected by a guard on each side that is not protected by a wall for the length, where,
(a) there is a difference in elevation of more than 600 mm between the walking surface and the adjacent surface, or
(b) the adjacent surface within 1.2 m from the walking surface has a slope of more than 1 in 2. (2) Guards are not required,
(a) at loading docks,
(b) at floor pits in repair garages, or
(c) where access is provided for maintenance purposes only. (3) Reserved
(4) Doors in buildings of residential occupancy, where the finished floor on one side of the door is more than 600 mm above the floor or other surface or ground level on the other side of the door, shall be protected by,
(a) a guard in accordance with this Subsection, or
(b) a mechanism capable of controlling the free swinging or sliding of the door so as to limit any clear unobstructed opening to not more than 100 mm. (5) Except as provided in Sentence (6), openable windows in buildings of residential occupancy shall be protected by,
(a) a guard in accordance with this Subsection, or
(b) a mechanism capable of controlling the free swinging or sliding of the openable part of the window so as to limit any clear unobstructed opening to a size that will prevent the passage of a sphere having a diameter more than 100 mm. (6) Windows need not be protected in accordance with Sentence (5), where,
(a) the window serves a dwelling unit that is not located above another suite,
(b) the only opening having greater dimensions than those allowed by Clause (5)(b) is a horizontal opening at the top of the window,
(c) the top surface of the window sill is located more than 480 mm above the finished floor on one side of the window, or
(d) the window is located in a room or space with the finished floor described in Clause (c) located less than 1 800 mm above the floor or ground on the other side of the window. (7) Except as provided in Sentence (8), glazing installed over stairs, ramps and landings that extends to less than 1 070 mm above the surface of the treads, ramp or landing shall be,
(a) protected by guards in accordance with this Subsection, or
(b) non-openable and designed to withstand the specified lateral loads for guards as provided in Article 4.1.5.14. (8) In dwelling units, glazing installed over stairs, ramps and landings that extends to less than 900 mm above the surface of the treads, ramp or landing shall be,
(a) protected by guards in accordance with this Subsection, or
(b) non-openable and designed to withstand the specified lateral loads for guards as provided in Article 4.1.5.14. (9) Glazing installed in public areas that extends to less than 1 000 mm from the floor and is located above the second storey in buildings of residential occupancy shall be,
(a) protected by guards in accordance with this Subsection, or
(b) non-openable and designed to withstand the specified lateral loads for guards as provided in Article 4.1.5.14.