240 volt AC backflow prevention

Good Morning,

I am a new member with a very specific question and design request.

I am a retired Mechanical Engineer though by working in the Pharmaceutical Industry have a basic grasp of electrical installation, though not design.

In a project that I am involved in domestically I would like to install an underfloor extension that has a 13amp plug in the floor (prongs facing up and level with the floor surface) going to a 13 amp socket in the skirting board in another room. The extension will be powered by a patch lead from an existing 13 amp socket to the floor plug. Having a socket in the floor would mean the patch lead would have two plugs on it which could expose someone to a shock if the patch lead floor plug was pulled out without switching the power off first.

I realise this is not normal and in some quarters frowned upon. I would like to fit a component in the extension lead to prevent any possibility of reverse flow causing the extension floor plug floor to become live. I have seen on the internet such devices associated with solar panels but they all seem to be for DC circuits.

Any help in this matter would be gratefully received.

The possibility of reverse flow is in my assessment highly improbable, but what do I know really?

Many thanks

Brian
 
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