Safety Flash: Short circuit on 440v AC bus bars-arc flash

At the time there were no injuries nor damage to equipment. The crewman reported the incident to his line manager, reporting that he felt shaken by the incident and felt his heart racing. He was sent to his cabin to rest.

Subsequent to the incident, the crewman reported experiencing blistering on his hands and attended a walk-in medical center where he was diagnosed with partial-thickness burns to his face. He was assigned light duties for two weeks.

What went wrong?

• Crew deliberately ignored safety protocols to expedite what was considered an easy and straightforward task:
  • one job was started (supervising the installation of a welding cable) but then changed to another job. The injured person did not discuss this work with his supervisor, nor carry out a risk assessment, TBT or raise a PTW for the work
  • there had been a generic toolbox talk (TBT) completed but work on the PDP was not mentioned;
• This incident was not reported in a correct or timely way, denying the injured person access to immediate medical attention which may have mitigated his injuries.

What lessons were learned?

• There was inadequate supervision with regards to compliance with electrical safety control measures;
• The risk of unauthorized access to the power distribution panel (PDP) had not been properly assessed;
• The panel had inadequate insulation of terminals which remained live when the panel was opened, this may have been broken off or removed over time.

What actions were taken?

• Access to electrical cabinets should be restricted;
• Electrical safety audit conducted onboard vessel;
• Risk assessment to be re-written to include mitigations to identified hazards;
• Further incident reporting and investigation training to be delivered to the vessel crew.