OVERHEAD POWER LINES TOOLBOX TALK
Electrical contact is not always required; high voltage can arc across an air gap.
Safe clearance for cranes, MEWPs, scaffolds and long conductive materials.
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Toolbox Topic
OVERHEAD POWER LINES TOOLBOX TALK
Duration
8–10 minutes
Date
Site / Area
Supervisor
Company
Participants
Document No
OBJECTIVE
Prevent cranes, MEWPs, scaffolds, pipes, ladders and other conductive equipment from approaching overhead electrical lines dangerously.
WHY IT MATTERS
High voltage can arc through air without direct physical contact.
Changing boom angle, ground slope or visibility can quickly reduce an initially safe clearance.
Minimum approach distance must never be guessed when the line voltage is unknown.
REALISTIC SITE SCENARIO
A mobile crane raised its boom parallel to an overhead line while positioned on sloping ground.
The operator could not accurately judge the clearance from the cab.
A defined approach limit, dedicated spotter and movement restriction would have prevented the exposure.
REMEMBER
Treat every overhead line as energised until isolation has been formally confirmed.
KEY HAZARDS
Crane or MEWP boom approaching an energised conductor.
Long metal pipes, ladders or sections contacting overhead lines.
Electrical arcing through equipment to ground.
Incorrect assumption that rubber tyres provide complete protection.
Operator blind spots causing incorrect distance judgement.
Wet weather increasing electrical exposure.
Unknown line height or voltage.
Step-potential exposure around energised equipment.
CONTROLS
Confirm line voltage and required minimum approach distance.
Where possible arrange de-energisation and isolation before work.
Install physical height restriction goalposts when isolation is not possible.
Use a dedicated spotter for crane and MEWP movements.
Set boom or movement limiting devices where available.
Do not carry long conductive materials upright beneath overhead lines.
Clearly mark the approach boundary.
Provide sufficient lighting for night operations.
Brief the operator to remain in the cab if equipment contacts a live line unless immediate danger requires evacuation.
Reassess clearances whenever equipment position or work method changes.
SUPERVISOR MESSAGE
Team, high voltage can arc without direct contact. We will treat the line as live, maintain the approved clearance and never move lifting or access equipment close to it without a spotter.
TEAM QUESTIONS
Do we know the line voltage?
What is our minimum approach distance?
Who is the dedicated spotter?
Are boom limits configured?
What route will long materials use?
What must the operator do after electrical contact?
FIELD VERIFICATION
Line identified
Voltage confirmed
Clearance defined
Spotter assigned
Barrier installed
Boom limit checked
Material route safe
Lighting adequate
Emergency response briefed
Crew informed
ATTENDANCE AND APPROVAL
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Supervisor Signature
HSE Approval
SERNEM HSE Resource – Permit conditions, risk assessments and site procedures take priority.