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Can you buy LED ovens and LED hot plates and LED air conditioners and .... I ran 120m of 25mm^2 copper mains in yesterday (it was super heavy) so reducing the amount of copper in the house wiring is a moot point. My original post wasn't to start an argument. I was honestly interested in...

If you had a modest 4/2/2 you would probably use at the very most 1kg of copper in the phone/network system. The electrical would easily be 30kg of copper. So you change all the phone's/networking to fibre optic and the amount of copper you have used is... 3% less. You can't run power...

You're kidding, no?

Care to explain?