9.
TRESTLE SCAFFOLD
Figure 8.5m for boards 50mm thick.6m must tied the building give
them stability.5m from the working
platform, trestles may not used.
. least one-third the trestle must
be above the working platform.7
Correct procedure for erecting long extension ladder.
MOBILE SCAFFOLD TOWERS
Mobile scaffold towers may constructed basic scaffold components
or made from light alloy tube. scaffold tower shown in
Fig.Basic Electrical Installation Work
168
Safety First
Scaffold
● scaffold mobile towers are
always safer than ladders for
working above ground.
Trestles which are higher than 3. The platform must be
at least two boards 450mm wide. The boards which form the working platform should
be equal length and not overhang the trestles more than four times
their own thickness. the platform more than above the
ground, toeboards and guardrails must fitted, and separate ladder
provided for access. 8.
Start position
Footing
base of
ladder
Lift and walk
towards wall
Continue until
upright
FIGURE 8.3m for boards 40mm thick
● 2. The maximum span boards between trestles is:
● 1. The tower built slotting the sections
together until the required height reached.8
A trestle scaffold. Two pairs trestles spanned scaf-
folding boards provide simple working platform.8 shows trestle scaffold. Where anyone can fall more than 4.
FIGURE 8
