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
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