I agree disconnecting equipment to its aerial would prevent them earthing lightening. But not unplugging it from the grid. 2 different wires.
I don't think it would matter if it was turned on or off.
Is there a separate issue perhaps with the grid being affected during a storm.
Not a lightening strike on the house via aerial, but surge in power supply.
That could blow equipment if switched on. But it would not be dangerous - the lightening would not be doing it, just fluctuating current.
There are a lot of safety devices installed in the grid to keep things from fluctuation. I wonder if, in France, with its larger land mass, the system is less protected.
This is an interesting topic. Will quiz DH again.
Well Labour’s “patriotism” didn’t last very long, did it? 🇬🇧