(a)
is of sufficient strength to sustain a live load of 4.8 kPa,
(b)
is a minimum of 1.12 m in width,
(c)
is pitched not less than 20Â degrees and not more than 35Â degrees from the horizontal,
(d)
has risers constant in height that are not less than 127 mm and not more than 200 mm,
(e)
has a maximum height of 3.7 m between landings,
(f)
has landings, if any, with a minimum clearance of 1.12 m measured in the direction of the run,
(g)
has a vertical clearance of 2.05 m from the top of the tread at all points in the stairway,
(h)
has treads constant in width and not less than 225 mm in width, and
(i)
has a non-slip nosing or a strip of non-slip material not less than 50 mm in width and installed 25 mm from the front edge of the tread on all treads where there may be a hazard of slipping due to the material of the tread.
115(2)Paragraphs (1)(b), (c) and (h) do not apply to a service stairway.
115(3)An employer shall ensure that a service stairway
(a)
is a minimum of 900 mm in width,
(b)
is pitched not less than 20Â degrees and not more than 50Â degrees from the horizontal, and
(c)
has treads constant in width and not less than 150 mm in width.
115(4)An employer shall ensure that a stairway having four or more risers
(a)
that are 2.24 m or less in width, has a handrail and supporting structure on any open side and a handrail on any enclosed side, and
(b)
that are more than 2.24 m in width, has a handrail and supporting structure on any open side and in the centre and a handrail on any enclosed side.
115(5)An employer shall ensure that a handrail and supporting structure referred to in subsection (4) is constructed so that
(a)
the height of the handrail and supporting structure from the upper surface of the handrail to the surface of the tread in line with the face of the riser at the forward edge of the tread is not less than 750 mm and not more than 900 mm,
(b)
the supporting structure is capable of withstanding a load of 100 kg applied in any direction,
(c)
the handrail is
(i)
continuous throughout the flight of stairs and landings,
(ii)
capable of withstanding a load of 100 kg applied in any direction, and
(iii)
at least 40 mm wide,
(d)
a handrail mounted directly on a wall or partition is fixed so as not to interfere with the smoothness of the top and side surfaces, and
(e)
if brackets are used, the brackets to which a handrail is fixed are spaced not more than 2.4 m apart and have a clearance of at least 40 mm between the handrail and any wall or partition or any obstruction on the wall or partition to which the brackets are attached.
115(6)Notwithstanding subsections (1) to (5), where a stairway was installed in an underground mine before the commencement of this section, an employer shall ensure that the stairway
(a)
is installed at an angle not greater than 50Â degrees,
(b)
has a rise or vertical distance between landings of a flight that does not exceed 3.5 m,
(c)
has treads and risers of uniform width and height in any one flight, and
(d)
has guardrails and handrails of adequate strength that are not less than 900 mm and not more than 1.2 m in height above the treads of the stairs.
(a)
is of sufficient strength to sustain a live load of 4.8 kPa,
(b)
is a minimum of 1.12 m in width,
(c)
is pitched not less than 20Â degrees and not more than 35Â degrees from the horizontal,
(d)
has risers constant in height that are not less than 127 mm and not more than 200 mm,
(e)
has a maximum height of 3.7 m between landings,
(f)
has landings, if any, with a minimum clearance of 1.12 m measured in the direction of the run,
(g)
has a vertical clearance of 2.05 m from the top of the tread at all points in the stairway,
(h)
has treads constant in width and not less than 225 mm in width, and
(i)
has a non-slip nosing or a strip of non-slip material not less than 50 mm in width and installed 25 mm from the front edge of the tread on all treads where there may be a hazard of slipping due to the material of the tread.
115(2)Paragraphs (1)(b), (c) and (h) do not apply to a service stairway.
115(3)An employer shall ensure that a service stairway
(a)
is a minimum of 900 mm in width,
(b)
is pitched not less than 20Â degrees and not more than 50Â degrees from the horizontal, and
(c)
has treads constant in width and not less than 150 mm in width.
115(4)An employer shall ensure that a stairway having four or more risers
(a)
that are 2.24 m or less in width, has a handrail and supporting structure on any open side and a handrail on any enclosed side, and
(b)
that are more than 2.24 m in width, has a handrail and supporting structure on any open side and in the centre and a handrail on any enclosed side.
115(5)An employer shall ensure that a handrail and supporting structure referred to in subsection (4) is constructed so that
(a)
the height of the handrail and supporting structure from the upper surface of the handrail to the surface of the tread in line with the face of the riser at the forward edge of the tread is not less than 750 mm and not more than 900 mm,
(b)
the supporting structure is capable of withstanding a load of 100 kg applied in any direction,
(c)
the handrail is
(i)
continuous throughout the flight of stairs and landings,
(ii)
capable of withstanding a load of 100 kg applied in any direction, and
(iii)
at least 40 mm wide,
(d)
a handrail mounted directly on a wall or partition is fixed so as not to interfere with the smoothness of the top and side surfaces, and
(e)
if brackets are used, the brackets to which a handrail is fixed are spaced not more than 2.4 m apart and have a clearance of at least 40 mm between the handrail and any wall or partition or any obstruction on the wall or partition to which the brackets are attached.
115(6)Notwithstanding subsections (1) to (5), where a stairway was installed in an underground mine before the commencement of this section, an employer shall ensure that the stairway
(a)
is installed at an angle not greater than 50Â degrees,
(b)
has a rise or vertical distance between landings of a flight that does not exceed 3.5 m,
(c)
has treads and risers of uniform width and height in any one flight, and
(d)
has guardrails and handrails of adequate strength that are not less than 900 mm and not more than 1.2 m in height above the treads of the stairs.