Earth bonding question

[Welderpaul]

We have had a new gas meter fitted at work, to power workshop heating. There is no outgoing pipework yet, that will be done by the fitters when they turn up.

Presuming the pipework on the outgoing side of the meter requires earth bonding, what size earth is required? 6mm?

Where does the earth need to come from? The supply is PME so I can't get to the earth terminal in the cut out and there is no separate earthing block next to it. I presume I can just come straight out of the earth bar in the 3 phase distribution board?

 

[Robotstar5]

PME installations, earth bonding sizes are determined by the neutral conductor size, need MK with his regs book, think it's section 544

Copper equivalent cross sectional area of the supply neutral conductor in relation to minimum copper equivalent cross-sectional area of the main protective bonding conductor
35mm2 or less = 10mm2
35mm2 up to 50mm2 = 16mm2
50mm2 up to 95mm2 = 25mm2
95mm2 up to 150mm2 = 35mm2
Over 150mm2 = 50mm2

Probably need to get DNO to install MET (main earth terminal) near intake

 

[gaz1]

normally its from the meter paul if you cannot get to the main earth then an earth block can be used to connect all the earths up to it

or as quoted a main earth terminal

 

[Welderpaul]

This is what we have.

Gas (and water) incoming mains are MDPE. The earth comes out of the cut out and into the DB.
Just been for a wee and note that the copper pipes in the building are earthed (Earth tag on copper side of stop tap.)

 

[Spark plug]

That supply only appears to be a standard 60kva supply, I witch case 10mm will be fine but 16mm will be overkill if you want to be sure.

On the other hand that seems a very small supply for your needs.