Electrical installations 26.45 An employer must ensure that all electrical circuits and equipment in
an excavation are installed in accordance with the requirements of
the Manitoba Electrical Code.
Haulage buckets 26.46 An employer must ensure that a worker in an excavation does not
load a haulage bucket to the point where material is likely to fall out
of the bucket.
Storage and dispensing of flammable liquids 26.47 An employer must ensure that flammable and combustible liquids
are not used in an excavation unless they are stored in accordance
with the Manitoba Fire Code and dispensed from safety containers
that meet the requirements of CSA Standard B376-M1980 (R2019),
Portable Containers for Gasoline and Other Petroleum Fuels. M.R. 128/2019
Workplace Safety And Health Regulation
246
UPRIGHTS (Vertical Members) STRINGERS / WALES (Horizontal Members)* CROSS-BRACES, STRUTS (Horizontal)* Category 1a
Stiff clays and
stiff to hard
clay tills, and
stiff fissured
clays
Depth
Member
minimum
dimensions
Maximum
spacing
horizontally
Member
minimum
dimensions
Maximum
spacing
horizontally
Member minimum
dimensions (mm)
Maximum
spacing vertically
(to match
Stringers / Wales)
Maximum
spacing
horizontally
along
Stringers /
Wales
Width of Trench (m)
(m)
(mm)
(mm)
(mm)
(mm)
less than
1.8 m.
1.8 m. to
3.7 m.
(mm)
(mm)
1.5 - 3.0 m
38 x 235
384
89 x 140
1200
89 x 89
140 x 140
1200
1291
3.0 - 4.5 m
38 x 235
344
191 x 191
915
89 x 89
140 x 140
915
1475
