Main gas bond to TT earth rod

[lilman]

What Code for a 10mm bonding cable that is directly connected to the properties earthing rod (TT) - ie. gas meter position is directly beside rod. Cable from rod to MET is 6mm.

 

[green-hornet]

No code required as it is up to regulations.

Thats rubbish I have just read properly

 

[green-hornet]

Proper answer.

Bonding should not go to the rod just to the MET. This is so everything can be disconnected and checks made for continuity etc.

I would presume there is a MET apart from the rod?

I really have difficulty in coding something that is afterall connected to the main point of earthing.

So my first answer really should be ok, not ideal but within the regulations (just).

Could be argued that this is the met.

 

[initforthemoney]

Bonding can be connected to the CU, rod or met.

All that needs to be ensured, is that it can be easily disconnected for testing.

 

[ianmacd]

Bonding should be back to MET. MET is not MET if Earth is not in it. Given that its also different sizes we can assume its not continuous either so removing the gas bond will loose the Eath all together.

Code 2?

 

[lilman]

Bonding should be back to MET. MET is not MET if Earth is not in it. Given that its also different sizes we can assume its not continuous either so removing the gas bond will loose the Eath all together.Code 2?

6mm earthing conductor from board to rod. Next to rod is gas meter position - 10mm bond from rod to gas pipe.

 

[sparkytim]

Should not the MET be A common point (at the same location) for connection of ALL protective conductors, CPCs, Bonding, and Earthing conductor?

 

[SLIPSHOD & SLAPDASH]

Bonding should be back to MET. MET is not MET if Earth is not in it. Given that its also different sizes we can assume its not continuous either so removing the gas bond will loose the Eath all together.Code 2?

What if the rod is the MET

 

[sparkytim]

But then CPCs would not be connected at SAME location.

Bit of a Grey area this one I think.

 

[ianmacd]

The Earth bar in a CU can be a MET but also may not be. That is fine. The MET is the first Earth Block after the Earthing method. The same appropriatly sized Earth conneciton is used from the MET to both Source of Earthing in the property and the CU('s).

In this example, it clearly has no MET. How can a Ze reading be done?

 

[ianmacd]

What if the rod is the MET

How can it be? Is the CU directly connected to it? If anything the Gas pipe is the MET but the cable sizes still should be the same.

 

[ianmacd]

I read that round the other way (as in MET-pipe-rod).

Rereading it then thats just lazy. Still agree its a code 2 and there should be a 10mm to the pipe and 16mm to the rod (assuming the supply cables are >15mm).

 

[steptoe]

I read that round the other way (as in MET-pipe-rod). Rereading it then thats just lazy. Still agree its a code 2 and there should be a 10mm to the pipe and 16mm to the rod (assuming the supply cables are >15mm).

16mm tails would allow a 10mm to the rod from MET, but require a 16mm from MET to CU,

(weird I know?!)

personally its not ideal, but perhaps a 2 at most.

for a remedial I would run a 16 from rod to MET,

a 10mm from gas to MET,

and a 16 from MET to CU.

HTH