2022 Manitoba Workplace Safety and Health Act and Regulation

Walkways
26.13(1) If a worker is required or permitted to cross over an excavation,
an employer must ensure that the excavation is equipped with
an adequate walkway with suitable guardrails that meet the
requirements of Part 14 (Fall Protection).
26.13(2) An employer must ensure that the walkway required under
subsection (1) is kept clear of obstructions, excavated materials and
equipment.
Safe means of entering and leaving an excavation 
26.14(1) If a worker is required or permitted to enter an excavation, an
employer must provide the worker with a safe means of entering and
leaving the excavation.
26.14(2) If a worker is required or permitted to enter an open excavation
or trench that is more than 1.5 m deep, an employer must provide
a ladder, stairway or ramp as a means of entering and leaving the
excavation or trench.
26.14(3) If a ladder is used as the means for entering and leaving an open
excavation or trench, an employer must ensure that the ladder
(a) extends 1 m above the top of the excavation or trench; and
(b) is located not more than 3 m from the worker, when a ladder is
used in a trench.
SUPPORT STRUCTURES
Open excavations
26.15(1) An employer who requires or permits a worker to enter an open
excavation that has a depth of 1.5 m or less must ensure that the
excavation has a support structure installed in it, but only if there is
a danger of cave-in, collapse or material sliding or rolling into the
excavation due to soil or work conditions at the construction project site.
26.15(2) An employer who requires or permits a worker to enter an open
excavation that has a depth of more than 1.5 m but not more than
3 m must ensure that
(a) the walls of the excavation are sloped at an angle not greater
than 45° measured from the horizontal plane;
(b) a combination of slope and vertical face is used for stabilizing
the walls of the excavation, so that the vertical face is not more
than one metre high and the remaining walls are sloped at an
angle not greater than 45° measured from the horizontal plane;

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Workplace Safety And Health Regulation
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(c) shoring that is constructed of components that meet the
minimum requirements for the applicable soil conditions set out
in the Schedule to this Part is installed;
(d) a support structure other than shoring is installed; or
(e) the walls of the excavation are stabilized in a manner that has
been designed and certified by a professional engineer.