It is OK to earth the gas mains to a metre long iron rod driven into the ground? This is avaliable to purchase. I can earth it to the post on the electricity meter board but running the wire to it from the gas mains, which is outside, means drilling through the outer wall and trailing the wire into the space under the stairs.
Earthing the gas supply
- Thread starter lxbn
- Start date
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As far as I know you only need to earth to the internal suppliesand why you would be wanting to earth the gas mains needs further explanation.
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Since earth bonding is the province of a gas engineer then this is the best forum.
As stated, it needs to be bonded with 10mm² cable from within 600mm of the meter outlet and to the earth tag at the electricity supply point.
Before any branches off as well.
Tony
As stated, it needs to be bonded with 10mm² cable from within 600mm of the meter outlet and to the earth tag at the electricity supply point.
Before any branches off as well.
Tony
1
1CANHELP
The Bonding as some people are referring to is actually called a main protective bond and it does not always have to be 10mm2.
The main protective bond has to be sized with respect to the neutral conductor of the main supply. For a TN-S supply it can be as little as 6mm2 upwards for a TN-C-S supply it will be in most domestic situations a minimum of 10mm2
What supply do you have? If it's a TT supply then using an earth rod would be acceptable however, if it is TN-S or TN-C-S then you cannot use an earth rod, the main protective bond requires taken back to the Main Earth Terminal.
If you were to use an earth rod on a TN supply you would be potentially introducing a differing potential into the properrty than that introduced by services connect to the man earth terminal. This you cannot do!!!!
Get an electrician to check it for you!
Whats the saying......'A little knowledge/experience is a dangerous thing'
Regards,
An NICEIC, Gas Safe, OFTEC and MCS registered business/installer.
The main protective bond has to be sized with respect to the neutral conductor of the main supply. For a TN-S supply it can be as little as 6mm2 upwards for a TN-C-S supply it will be in most domestic situations a minimum of 10mm2
What supply do you have? If it's a TT supply then using an earth rod would be acceptable however, if it is TN-S or TN-C-S then you cannot use an earth rod, the main protective bond requires taken back to the Main Earth Terminal.
If you were to use an earth rod on a TN supply you would be potentially introducing a differing potential into the properrty than that introduced by services connect to the man earth terminal. This you cannot do!!!!
Get an electrician to check it for you!
Whats the saying......'A little knowledge/experience is a dangerous thing'
Regards,
An NICEIC, Gas Safe, OFTEC and MCS registered business/installer.
1
1CANHELP
It's not the gas meter or inlet supply to the gas meter that needs a main protective bond it is the outlet from the gas meter. If it is an internal or external meter makes no diferrence at all.
The main protective bond is to be fitted within 600mm and or before any branches as the gas pipe ENTERS the building i.e the connection has to be internal.
Regards,
An NICEIC, Gas Safe, OFTEC and MCS registered business/installer.
Thanks for the lively discussion. This has gone beyond my comprehension – types of supply etc.! My plumber will be popping in to-morrow, I'll check with him.
For my part, I have zero competence in commenting on anyone’s contribution on this subject - thanks for all the advice anyway!
For my part, I have zero competence in commenting on anyone’s contribution on this subject - thanks for all the advice anyway!
1
1CANHELP
In short, if you do not live out in the sticks and are not supplied by over head lines then......you will have a TN supply.
Therefore, you cannot use an earth rod.
An electrician is who you need to speak to as the plumber can only advise and he did so correctly that the gas pipe needs a main protective bond. The size and route of this bond can only be determined/fitted by an electrician. Make sure they are NICEIC approved and that you receive a minor works cerrtficate for the work done.
As you have noticed some of the posters have disapeared! this happens when a professional who does know what they are talking about appears.
This is a dangerous site where the short course trained discuss and give out advice on matters which, they are not trained and or experienced in. Be very wary!!!!!!!!!!!!!!!!!!!!!!! when taking advice on matters such as gas, plumbing or electrics on a internet forum.
Regards,
An NICEIC, Gas Safe, OFTEC and MCS registered business/installer.
1
1CANHELP
On gas courses they give a generic size of 10mm2 as this is the min size for a TN-C-S supply. On occasions a 6mm2 will suffice on a TN-S supply.
On TN-C-S supplies, the earth bonding can on occassions carry high current loads due to the nature of this supply. Therefore, the min of 10mm2 is required.
Therefore, on the gas course where they are instructing non competent operatives with regards to electricals, thay say 10mm2 to err on the side of safety.
With all due respect to you and your tutor, you are not timeserved electricians with the relevant qualifications/experience or registrered with a competent body such as NICEIC.
Therefore, you are not competent to comment on this matter!!!!!!!!!!!!!!
I reiterate again
Whats the saying......'A little knowledge/experience is a dangerous thing'
Regards,
A NICEIC, Gas Safe, OFTEC and MCS registered business/installer.
1canhelp is spot on i was reading this in the gas installer not long ago
1
1CANHELP
Incidently,
My business is currently installing upwards of 3 oil heating installations a week on contract and the main protective bond required in most of the premises is 6mm2 on the oil supply.
We are also installing upwards of 5 NG heating installations a week where the main protective bond is 10mm2 on the gas supply.
It depends on the nature of the incoming supply as to which, size the main protective bond has to be.
Always consult a timeserved tradesman when dealing with Gas, Oil, Plumbing and electricals.
Regards,
A NICEIC, Gas Safe, OFTEC and MCS registered business/installer.
My business is currently installing upwards of 3 oil heating installations a week on contract and the main protective bond required in most of the premises is 6mm2 on the oil supply.
We are also installing upwards of 5 NG heating installations a week where the main protective bond is 10mm2 on the gas supply.
It depends on the nature of the incoming supply as to which, size the main protective bond has to be.
Always consult a timeserved tradesman when dealing with Gas, Oil, Plumbing and electricals.
Regards,
A NICEIC, Gas Safe, OFTEC and MCS registered business/installer.
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