On Wednesday, January 4, 2017 at 12:58:25 PM UTC-5, James Wilkinson Sword wrote:
Somebody in one of these two groups recently said that a concrete based house means you're earthed. Concrete is a bloody good insulator!

Sorry, can't find the post it was mentioned in.



Wrong as usual. Concrete that's been cured and then dried out,
kept away from moisture, may not be a good conductor. But building
concrete, a foundation is such a good conductor, it's the preferred
ground for the building electrical service. An electrode is placed
inside it before the pour.