Arco Training and Consultancy
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Personal Fall Protection<br />
Calculating the Risk<br />
A personal fall arrest system consists of:<br />
A Anchor devices<br />
B Body harness<br />
C Connecting devices<br />
The system will not work without all these elements <strong>and</strong> each must be in place before work at<br />
height commences.<br />
Join the<br />
connecting<br />
device to the<br />
anchorage<br />
point, which<br />
include steel<br />
anchors,<br />
concrete anchors,<br />
roof anchors <strong>and</strong><br />
slings, or a tie off<br />
point such as an<br />
I-beam, scaffolding<br />
or other structural<br />
point.<br />
Anchor<br />
Devices<br />
BBody<br />
Harness<br />
Relates to the personal protective<br />
equipment that is worn by the wearer.<br />
The harness must be selected based<br />
on the type of work involved <strong>and</strong> the<br />
environment.<br />
The harness must enable the wearer to<br />
work freely without any restrictions <strong>and</strong><br />
provide protection to the worker if a fall<br />
does occur.<br />
C<br />
Connecting<br />
Devices<br />
Connect the worker's full body harness<br />
to the anchor device. Connecting<br />
devices include:<br />
• Lanyards which are shock absorbing<br />
• Self retracting lifeline blocks<br />
• Fall limiters<br />
• Rope grabs<br />
Underst<strong>and</strong> your fall factors to reduce the<br />
risks <strong>and</strong> underst<strong>and</strong> the work hazards.<br />
There are three fall factors in fall arrest that relate to the<br />
position of the anchorage point. They are used to determine<br />
the potential fall distance of a worker <strong>and</strong> so ensure that<br />
there is no risk of contact with the lower level in the event<br />
of a fall. When possible, the worker should always use an<br />
anchorage point at shoulder level or above (Factor 1 or 0).<br />
A higher anchorage point will reduce the fall distance <strong>and</strong><br />
therefore significantly reduce the risk of injury on the body<br />
due to the impact forces of a fall.<br />
Calculating your fall arrest <strong>and</strong><br />
safe working height<br />
Calculations using a fall arrest lanyard fixed at foot level<br />
2m 1.5m<br />
Lanyard Lanyard<br />
Lanyard Length 2m 1.5m<br />
Energy Absorber 1.75m 1.5m<br />
Body Height 2m 2m<br />
Safety Distance 1m 1m<br />
Minimum Clearance 6.75m 6m<br />
Examples of fall factors<br />
Fall Factor 0 - Anchor point above head<br />
Fall Factor 1 - Shoulder level<br />
Length of<br />
the lanyard<br />
Height of<br />
the person<br />
Safety distance<br />
Length of<br />
the lanyard<br />
Reduced/partial<br />
shock absorption<br />
Height of<br />
the person<br />
Length of<br />
the lanyard<br />
2m/<br />
1.5m<br />
Safety distance<br />
Length of the<br />
shock absorber<br />
1.75m/<br />
1.5m<br />
Fall Factor 2 - Foot level<br />
Height of<br />
the person<br />
Safety<br />
distance<br />
2m<br />
1m<br />
Length of<br />
the lanyard<br />
Full deployed<br />
shock absorption<br />
Height of<br />
the person<br />
Safety distance<br />
5 www.arco.co.uk<br />
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