Fatal electrocution

IMCA has learnt of a fatal incident in which a person was electrocuted. A rig sub-contractor suffered fatal injuries from electrical shock whilst performing a welding operation. A lamp used to illuminate the worksite was found to be a potential source of electrical shock as the lamp’s electrical cord was found to have been damaged. The damage may have been caused by a pinching action of the cord between the loose mounting bracket of the light and the light housing which was observed to be in contact with the victim’s body.

Further investigation revealed the following:

• A ground fault circuit interrupter (GFCI) was not utilised and the circuit breaker did not trip when the incident occurred;
• The lamp used was designed for permanent exterior mounting and had been modified for use as an interior portable illumination source;
• Sub-contractor personnel had not been effectively supervised;
• An effective pre-job (pre-start) safety discussion had not taken place;
• The approved job safety analysis (JSA) overlooked the potential for electric shock hazards and for cord damage and did not address the actual work that was performed;
• Confined space entry was not considered or included in permits;
• The hot work permit review process was not effective.

The following lessons were learnt:

• When using portable electric tools in potentially damp areas, a GFCI (fixed or portable) should be utilised to protect personnel from potential electrical shock;
• All tools and equipment should only be used for their intended and manufacturer’s recommended purpose; any change to a tool or equipment’s intended purpose should be thoroughly reviewed and approved through an effective management of change (MoC) process;
• An effective pre-start meeting should be held with the personnel performing the work to ensure that all hazards have been identified, proper tools are being utilised and the job scope is well defined and understood. The supervisor in charge of the worksite should be responsible for having this meeting. A field review of the work site should be part of this meeting;
• JSAs should be specific to the job being performed. JSAs should focus on the steps taken to accomplish the task rather than generalised statements that cover a wide range of activities. JSAs should focus on hazard identification and mitigations for each hazard;
• Established procedures for issuing and approving general work permits, hot work permits, and confined space entry permits should be rigorously followed to ensure necessary steps have been taken to minimise risk of injury, including a survey of the work site by the person in charge.