Mains extension melted – not fully paid out
What happened
A mains extension cable melted during use. This occurred during cutting on deck on a vessel in dry dock; sub-contractors did not fully pay out an extension cable reel they were using to power their equipment. As a result there was induction heating and a melting of cable cord.
Additionally, it was noted that the extension cable was damaged and fixed by tape in places.
What went wrong
The sub-contractor personnel were unaware of the dangers of induction coil heating on mains extensions not fully unwound. The extension cable and reel had not been inspected by a qualified person before use, and given the fact that it had a taped repair, should never have been used at all.
Actions
- Thorough inspection of mains electrical cabling before use;
- Fully pay out coiled mains extension cables before use;
- Consider the use of specialist 110v electrical equipment.
Please review IMCA “Are you prepared to work safely” video #14 on Electrical hazards.
Members may also wish to review:
- Smouldering coiled extension cable
- Shipyard worker receives electrical shock [damaged section in a cable on deck]
- Use of portable electrical deck equipment
Safety Event
Published: 12 July 2021
Download: 
IMCA SF 19/21
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