Can I use this earth?

[torrow]

I'm looking for a way to earth in an old 4 story building. At the front of the building is the mains supply in, with meter etc. In the ground under where the meter is situated is a good copper earth rod. A single wire runs up from the rod to a small white plastic box, on which is the tube for the electric bill. From this box, twin core (both black) comes out.

[Forkinhades]

Pictures please.

[Crossy]

Yes, we need to see photos, but I suspect it's one of the MEA/PEA grounding points in which case you should not use it (it's their property).

If you can get a wire down to that point it's only a little further to get your own rod in, Forky will let us know how far from the PEA rod this rod should be positioned.

[torrow]

Thanks for the replies. Pictures as requested

[RichCor]

The 'small' box in your second picture is a Telephone drop wire station protector (over-voltage arrestor). It and the ground spike are put in by the Telco and are considered part of their equipment.

[Crossy]

Yup ^^^, using that rod is a no-no, sorry.

You could put a clamp on that iron water pipe that goes into the ground if you can't get a rod in.

[torrow]

Thanks. Sad for me