Now that winter is approaching, it is a good idea to run an electric blanket through a 30mA RCD Powerbreaker Safety Adaptor (the sort they use with lawn mowers etc), in addition to the usual council safety inspection checks etc...
No point as the person in bed has no route to earth.
The main dangerous failure mode in electric blankets is a hot spot where the element has been abraded thinner than the rest of the element. This will not be detected by RCD or fuse and may lead to a fire.
Another dangerous fault is when two parts of the element have lost their water proof insulation. In the event of bed wetting the two bare areas may lead to a currrent flow through the wet bedclothes and this may affect the person in the bed. Again there is no path to earth so the RCD will not be tripped.
I agree with Bernard, as the majority of electric blanket related accidents are caused by fire not by electrocution, the use of an RCD will not prevent this.
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