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600mm is recommended by OSG - but the regs actually say it should be buried deep enough to avoid any foreseeable damage. I think I have seen recommendations of 600mm for general locations or 1m for ground likely to be ploughed or dug over????? I believe you could avoid burying where you have a...

I believe that these types are insulated differently (?) CH

I believe the regs state that ZE on TT should be as low as possible - but that anything above 200 ohms may not be stable (due to ground freezing or drying out). The 21 ohms is sometimes recommended by the DNO as per the previous post. Hope this helps CH