Failed or Absent Defences » LTA hazard identification

5Mine Worker Contacts 11kV Overhead Powerline



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Brief Description of Incident/Accident & Description of Consequences/Outcomes:

A mine worker climbed into the basket of a Force 800AJ JLG Boom Lift to take photographs of a nearby crane lift being conducted. The mine worker operated the boom lift to gain elevation and came into direct contact with one phase of a two phase 11000 volt overhead powerline. The mine worker fell to the floor of the basket and then called for help. Nearby workers lowered the basket to the ground and rendered assistance. The mine worker sustained burns to the right shoulder and both hands at the time of the incident.

Identified Root Causes:

Factors that contributed to this incident.

  • Boom lift parked directly under powerline.
  • Operator not focused on immediate surroundings.
  • No site requirement for Stop / Look / Assess / Manage type hazard identification processes prior to operating elevated work platforms.
  • Non essential powerlines in work area.
  • Lack of warning signs highlighting the powerlines, or barriers to prevent access by elevated vehicles.

Energy Type(s) Involved:

Electric shock, electrocution and severe burns. Other potential hazards include fires and explosions, particularly with rubber tyred vehicles.

Equipment Type(s):

Mobile machinery and overhead powerlines

Root & Contributing Cause(s):

LTA awareness

LTA isolation

LTA risk assessment

Stated or Potential Consequence(s):

Burns

Injury

Potential Fatality

Preventative/Recommended/Accepted Steps of Risk Mitigation, Points of Interest:

  • Ensure procedures are in place for operating vehicles and machinery in the vicinity of overhead powerlines. Refer to requirements of AS 3007.5 - 2004 Electrical installations - Surface mines and associated processing plant Part 5: Operating requirements.
  • Ensure operators of vehicles and machinery are trained in these procedures and are adequately instructed and supervised.
  • Review emergency procedures to ensure accidental contact with powerlines is considered. This should include how to identify the powerline involved, what to do and who to contact in the event of an incident.
  • Ensure all personnel on site are trained in these procedures.
  • Inspect worksite prior to undertaking all tasks.
  • Ensure warning signs and barriers are in place to highlight that powerlines are in the vicinity. Signage should outline the safe clearance distances required for vehicle movement.
  • Review powerlines on site to consider relocation or removal of the hazard to minimise risk.
  • Ensure clearly defined machinery parking areas are made available.

Organisation:

Queensland Government Department of Employment, Economic Development and Innovation (DEEDI)


Results

Here are the results.


Information

Reference Type:

Safety Alert #174

Mine Type:

Any Mine Type

Energy:

Electrical

Equipment:

Published:

2007

Region:

Australia, Queensland



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