November 1995 Danger to trailer boats from overhead power lines
In recent years a number of people have been killed or seriously injured when their boats, whilst being manoeuvred on land, have come into contact with overhead electric-power lines.
Safe practice tips
It is essential to ensure that the masts or stays of your boat will not come into contact with any overhead electric-power lines which may be in the vicinity of your launching point.
Always check the area through which you are handling your boat for any overhead power lines.
It is not always necessary for the masts or stays to touch a conductor as with high-voltage lines electric shock may be caused by a flashover in air. To avoid this danger it is important to allow plenty of clearance between overhead electric-power lines and any part of your boat.
IF IN DOUBT SEEK ADVICE FROM THE LOCAL ELECTRICAL SUPPLY COMPANY.
Original source content - Boat Notice 061995, November: Danger to trailer boats from overhead power lines.