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FFS .....There is no such thing as a "main Earth". It is called the Earthing conductor.
FFS .....There is no such thing as a "main Earth". It is called the Earthing conductor.
They do make up loads of carp.
An NIC spark had kicked off on a job I was on because a feed to a boiler had been piggy-backed off a 16A circuit feeding one socket.
When I suggested it was fine and showed him the OSG, he snorted,
"WE don't follow that piece of rubbish. Only the regs."
He was adamant it was non-compliant.
It’s always easier to snipe from the sidelines than actually contribute something.There is no such thing as a "main Earth". It is called the Earthing conductor.
You were correcting the poster about Earthing and bonding but using incorrect terminology nonetheless.It’s always easier to snipe from the sidelines than actually contribute something.
If you connect an TN-C-S earth to a gas pipe before the isolation block, and the TN-C-S earth is lost, then it can rupture the gas pipe with explosive results, one does need to be careful that a gas pipe can't become the earth for the whole street.
There's obviously at least some sense in that. However, if one of the intermediate connections 'loosens' (to the extent of there not being an electrically satisfactory connection between conductor and pipe), then one of the pipes will lose it's effective connection to the cable, even if it's not the pipe at the end of the cable!I learnt at college in the 80s that if you are running from one pipe to another (eg gas to water) then best practice is to make an unbroken loop around the screw so that if the connection loosens, you don't lose the connection to the pipe at the end of the cable.
What sort of "isolator" are you talking about - and what do you regard as being "the correct side"?In my old house there was an isolating block, so was just a case of ensuring the earth wire is connected to correct side. I have not as yet found a house without the isolator so never needed to worry about what to do if missing.
That goes without saying. The point is that, were it done with two separate conductors in the first bonding strap and that point came loose, BOTH would lose their connection.if one of the intermediate connections 'loosens' (to the extent of there not being an electrically satisfactory connection between conductor and pipe), then one of the pipes will lose it's effective connection to the cable, even if it's not the pipe at the end of the cable!
Yes, that might be the case. However, the point surely is that one doesn't want any pipe to end up unbonded (i.e. one, rather than two, unbonded extraneous-c-ps is still not acceptable), so one needs to address the quality of the connections to the pipes, regardless of how the cables are arranged (even if each pipe had a separate cable back to the MET, one of them could 'become loose' if not done properly).That goes without saying. The point is that, were it done with two separate conductors in the first bonding strap and that point came loose, BOTH would lose their connection.
You might be interested in this (click here) . Although it may be a 'recommendation', rather than a 'requirement' (both words appear in the title), it appears that, since 2015, it has been recommended/required that ...One such thing might be inserting a length of plastic pipe in the water supply (again, not the gas) so that main bonding is not required at all.
... but this one seems to be a 'requirement' ...ENA Engineering Recommendation G12 Issue 4 Amendment 1 December 2015 Requirements for the Application of Protective Multiple Earthing to Low Voltage Networks said:...Provision of earth terminal requires that where a metallic gas service is provided to a consumer’s premises with a PME earth terminal, an insulated insert should be fitted in the gas service.
I wonder if this is now being done routinely with new gas installations?IGEM/G/5 Edition 2 document said:Clause 11.2.1 states: …insulating fittings shall be installed in all metal pipe, whether gas carrying or containing a PE liner, capable of providing electrical continuity between earth and the above ground pipework.
Clause 11.2.2 states: Insulation fittings shall be installed in an accessible location as close to the pipes entry into the building or, in the case of external pipework, as close as possible to the pipes exit to the ground and upstream of any ECV. The uninsulated section of the exposed pipe shall be as short as possible.
Yes, but then up until and including the BYB 544.1.2 said "insulating section" and required the Main Bond to be on the customers side of that insulating section.You might be interested in this (click here) . Although it may be a 'recommendation', rather than a 'requirement' (both words appear in the title), it appears that, since 2015, it has been recommended/required that ...
... but this one seems to be a 'requirement' ...
I don't know.I wonder if this is now being done routinely with new gas installations?
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