3m for boards 40mm thick
● 2.8
A trestle scaffold.
FIGURE 8. The tower built slotting the sections
together until the required height reached. The maximum span boards between trestles is:
● 1.5m for boards 50mm thick.6m must tied the building give
them stability.
Trestles which are higher than 3.Basic Electrical Installation Work
168
Safety First
Scaffold
● scaffold mobile towers are
always safer than ladders for
working above ground.9. scaffold tower shown in
Fig. least one-third the trestle must
be above the working platform.8 shows trestle scaffold. the platform more than above the
ground, toeboards and guardrails must fitted, and separate ladder
provided for access.
TRESTLE SCAFFOLD
Figure 8. Where anyone can fall more than 4.7
Correct procedure for erecting long extension ladder.
Start position
Footing
base of
ladder
Lift and walk
towards wall
Continue until
upright
FIGURE 8. 8.5m from the working
platform, trestles may not used. The boards which form the working platform should
be equal length and not overhang the trestles more than four times
their own thickness. Two pairs trestles spanned scaf-
folding boards provide simple working platform.
MOBILE SCAFFOLD TOWERS
Mobile scaffold towers may constructed basic scaffold components
or made from light alloy tube. The platform must be
at least two boards 450mm wide.
