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Winter 08 - Nelson Tree Service

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F O C U S O N S A F E T Y<br />

Avoid Electrical Contacts with<br />

Proper Tree Trimming Techniques<br />

by Jeff Sachs, Safety Specialist, Region 466<br />

Over the previous several months the<br />

line clearance industry has experienced<br />

several disturbing incidents regarding<br />

electrical contact injuries and near<br />

misses. Electrical contact, directly or indirectly,<br />

is one of the worst types of injury a<br />

line clearance tree trimmer could sustain.<br />

As a Nelson Tree employee, you have<br />

been involved in safety stand-downs and<br />

received information on how to prevent these contact<br />

incidents. This is an extremely serious subject and, as<br />

part of Nelson Tree’s ongoing training, this article is<br />

devoted to providing more information on this topic.<br />

After investigating many of these electrical contacts,<br />

it has been determined that properly pruning a limb<br />

before cutting it, or placing a rope on the limb, could<br />

have prevented these electrical contacts.<br />

A proper job briefing is the best defense against<br />

breaking minimum separation requirements.<br />

The first and foremost factor in determining<br />

the potential of any limb breaking minimum<br />

separation is a thorough tree assessment<br />

that determines which limbs pose a<br />

risk before any work begins. Before<br />

contacting any limbs, ensure<br />

they are outside the minimum<br />

separation.<br />

PREVENT ELECTRICAL CONTACTS:<br />

• Use pruners to shorten limbs when there is growth<br />

inside minimum approach distance.<br />

• Use pruners to pull limbs back away from the<br />

conductors.<br />

• Use ropes to pull overhanging branches, and on<br />

branches leaning toward conductors that are too<br />

big to handle safely.<br />

• When roping, properly assess the weight of the limb<br />

and use an appropriate rope size and anchor point<br />

that is strong enough to support the limb.<br />

Proper crew leader supervision is critical<br />

in preventing limbs from contacting<br />

conductors. In the job briefing, the crewleader<br />

and the crew will determine the<br />

limbs that pose a risk, and the crewleader<br />

must provide direct supervision as these<br />

limbs are trimmed.<br />

Never slice cut limbs that have the potential to contact conductors! This<br />

is not the correct type of cut. Trimmers have little or no control of a limb<br />

once the slice cut is made. Slice cutting is only a safe technique when<br />

limbs are below the conductors. Instead, remove limbs using a hinge cut<br />

on the front side of the limb, then pull back with the pruner or a rope.<br />

7

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