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Hello Guys. Wondered if anyone can give me some advice on the best way to fix new 12x8 slates at the verges (other than just usual nailing) as my roof is very, very exposed to high winds and I don't want to risk of them being lifted off. Also, is it usual practice at a valley, to bed and...

I am not an electrician and wondered if anyone can explain why voltage drop is an issue in the following case:- A 50mm sq two core cable (earth rods at each end), 500m long from the remote meter box to my Farm supplying 230Vac single phase. If all my equiptment will work fine at 220Vac (and...