Earthing..confirmation

[gixxer1100]

Hi
I have a question regarding eathing.
I have two cosumer units about 3 feet apart one for a loft coversion 2 way and a 4 way for the ground and first floor

It is earthed as follows.

main earth from loft consumer unit is 10mm and connected to main earthing teminal block.
Main earth from ground and first floor consumer unit 16mm connected to the same 16 way earthing terminal block.
From suppliers tn-s sheath clamp connected to main 16 way earthing terminal block in 16mm.
Also on main earth terminal block are 10mm gas bond and a 10 mm water bond.

Is this correct arrangement?

In case of corrosion of the armoured sheath clamp would it be bad practice to fit an additional earth to 16 way earth terminal.

 

[gixxer1100]

Forgot to say,

Thank you any advise would be appreciated

Regards

 

[Pensdown]

Although you have 2 consumer units, assuming they are both fed via Henley blocks the earthing arrangements should be done as if they were one.

The 10mm should be up-graded to 16mm to the MET if your supply is 100A.

You can't go adding earth clamps to the supply cable, that's a job for the DNO.

If you're worried about corrosion you could ask for a PME conversion.

 

[gixxer1100]

Thank you for the fast reply

Yes the consumer units are both fed by henly blocks.

The recent wiring and consumer was inspected and tested by certified electrician who provided a report to the local council and electrical body.

I would assume that the main earth terminal would have been checked and metered as part of this inspection.

the old main earth bond consisted of a green 6mm wire that was wrapped around one of the screws on the main body of the incomming supply so the situation now must be safer.

Regards