Individual or Team Actions » LTA work method » LTA Standard Work Procedures (SWP)

46Penetration Into Concealed Services Buildings And Structures

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

An electrical contractor drilled through the outside of the mounting panel of a Motor Control Cubicle (MCC) for the blower fans on a dragline. The drill bit came into contact with a live 415V cable. The resulting flash caused some superficial burns to the left side of his face. He was wearing safety glasses and a hard hat the time. There was minor heat damage to the glasses.

Identified Root Causes:

The site Excavation / Penetration Permit, which is a formal procedure to control risks, was not used in this instance. The contractor was not made aware of this procedure during induction. In addition, the controls identified in the job safety analysis (JSA) developed for the task were not followed in full.

Energy Type(s) Involved:

Electric shock or electrocution

Equipment Type(s):

Motor Control Centre (MCC) for the blower fans on a dragline

Root & Contributing Cause(s):

LTA awareness

LTA competency

LTA risk assessment

LTA Standard Work Procedures (SWP)

Stated or Potential Consequence(s):

Potential serious injury

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

1. When compiling the scope of work for a contractor, the overall package should include the relevant procedures and SOPs to be included in the induction process.

2. A review of the procedures relating to penetration into concealed services - buildings and structures, should be conducted to ensure that there is reference to penetration of electrical panels or cubicles.

3. Where work is being carried out on removable and / or rackable modules in an electrical switchboard, it is strongly recommended that after being isolated, the module be removed from the switchboard prior to commencing work.


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


Here are the results.


Reference Type:

Significant Incident Report #58

Mine Type:

Any Mine Type







Australia, Queensland

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