Failed or Absent Defences » LTA protection

48Truck Tray Contacts 66 kV Powerlines



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

After night shift ‘smoko’ an operator returned to his parked truck and raised the truck tray. In the dark, witnesses saw electric arcing or glowing where the truck tyres contacted the ground.

An electrical ‘contact’ was made with overhead 66 KV powerlines despite the tray probably not touching them and no electric trip out occurring. A sign, not illuminated, was displayed nearby, warning that there were overhead powerlines 8 metres above the ground.

The driver was unaware of a problem until he saw people signalling frantically to him. After the tray was dropped, an examination revealed burn marks where the tyres had contacted the ground.

Fearing a tyre explosion, the truck was parked and isolated for a day.

Identified Root Causes:

Raised tray uder powelline

Energy Type(s) Involved:

Direct contact with live electrical conductors

Equipment Type(s):

Haul truck

Root & Contributing Cause(s):

LTA hazard identification

LTA infrastructure design

LTA parkup

LTA safety warnings

Stated or Potential Consequence(s):

Potential Fatality

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

HIGH RISK PERMITS were introduced for trucking activities near overhead powerlines.

? Hazards associated with overhead powerlines were repeated at tool box meetings.

? Signs were affixed inside truck cabins warning operators of powerline dangers.

? Lights/sirens which activate when the tray is raised were fitted in truck cabins.

? Parking was banned under powerlines.

In this situation it should be considered whether the cribroom could be moved away from the powerlines.

Organisation:

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


Results

Here are the results.


Information

Reference Type:

Significant Incident Report #M97/04

Mine Type:

Any Mine Type

Energy:

Electrical

Equipment:

Published:

1997

Region:

Australia, Queensland



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