Wandering round the net to see if somebody else had done the hard work on heat loss calculations I found this,
physics.stackexchange.com/questions/282465/what-happens-in-a-tightly-wound-up-cable-reel-under-ac-power
Whilst it is not totally definitive, it supports the view that heat issues are the primary problem.
Maybe the answer to improving safety amongst a non technically literate population is the introduction of a Wimshurst machine at Key Stage 1. That could teach some respect :)
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