Everything you want to know about TT earthing form the IET Wiring Matters an be found here
Everything you want to know about TT earthing form the IET Wiring Matters an be found here
Agree, I'd not spotted that. The water table is the level a well will fill to not the earth being damp enough to let the ions move which is much nearer the surface. Clearly unless you live in a valley the water table could be someway down…
Here for example all those red triangles indicate bore hole depths of 30m plus, green is 10-30m blue is 10m or less, black is not measured .. Spot the valleys..
Not to worry, 4 ft rod is typically 50 to 100 ohms here, actually if the hole fills with water it usually means you hit something driving it in, not the water table - and building control like soakaways which would not work if the water was that near the surface.
Mike.
Agree, I'd not spotted that. The water table is the level a well will fill to not the earth being damp enough to let the ions move which is much nearer the surface. Clearly unless you live in a valley the water table could be someway down…
Here for example all those red triangles indicate bore hole depths of 30m plus, green is 10-30m blue is 10m or less, black is not measured .. Spot the valleys..
Not to worry, 4 ft rod is typically 50 to 100 ohms here, actually if the hole fills with water it usually means you hit something driving it in, not the water table - and building control like soakaways which would not work if the water was that near the surface.
Mike.