Bonding gas service ... or not!

[zap]

I'm working at a friend’s place and trying to keep costs down so here goes...

The gas meter is external and it feeds a boiler under the bungalow. (built on a hill).
The boiler ignition is fed via class II accessories and there is no prospect (I think) of an earth fault posing a threat.
There is no gas supply within the dwelling i.e. living areas.
The water supply is bonded to the met and tests satisfactory.

Does the gas service still require bonding? and if so, why.

Any help will be hugely appreciated.

 

[Geordie Spark]

geordie, on this one. i'd |IR the metal part og the gas pipe to the MET. >22kOhms, then i'd consider it not to be extraneous.

Thanks Tel.

That's what I did and found no need to bond, so didn't.

The really hard part was convincing the "Gas Person" and the customer (my mate as it happens) that there was no need, and I'm not sure if I succeeded there !!

 

[telectrix]

OK, you have a safe limit of 10mA through your body without the prospect of injury. so 230V/0.01A = 23kOhms. the reistannce of your body is 1K0hm, so there you get 22K.

 

[zap]

OK, you have a safe limit of 10mA through your body without the prospect of injury. so 230V/0.01A = 23kOhms. the reistannce of your body is 1K0hm, so there you get 22K.

Thanks for that Tel, it makes sense now.

 

[Guitarist]

Yet another long post lost to the ongoing problem. Thought it was sorted!

 

[Geordie Spark]

Yet another long post lost to the ongoing problem. Thought it was sorted!

Just when you thought it was safe to jump back into the water ........

 

[telectrix]

rather jump into as beer barrel. at least you drown happy.

 

[Deleted member 9648]

If I'm reading this right the advice given in this thread is incorrect. If both the gas and boiler are external and there is no gas service into the property then there is no reason to bond the gas. Metallic heating pipes/services from the boiler to the property will require main bonding at the point of entry to the building.

 

[nickblake]

Im always sceptical about main service bonding especially on a TNCS system , you loose the neutral at the met , it then sticks around 150 volts down every metallic part that's bonded including the gas pipes as well as causing hell on 3 phase systems ,evry metallic part is live radiators cooker fridges sinks baths if metal taps ,do bond mind religiously

 

[44ALLAN]

If I'm reading this right the advice given in this thread is incorrect. If both the gas and boiler are external and there is no gas service into the property then there is no reason to bond the gas. Metallic heating pipes/services from the boiler to the property will require main bonding at the point of entry to the building.

And...................

If the incoming services are plastic.................then copper after that.............then the copper should be bonded.............or words to that affect lol.
Equipotential/touch voltages etc etc ................it's late

 

[Capra]

Just about to do a CU change at a property. Recently had a smart meter installed for gas and elec. The earth bonding as been disconnected from the gas (and clamp removed) and also disconnected from MET. Any ideas why this is?

 

[Taylortwocities]

Unskilled meter changer? Complain to the company.

PS It would have been better to start a new topic, rather than hijack an ancient 3-year old one.

 

[Capra]

Thanks. Thought it may be that. Excuse my lack of forum manners.. I'm new to this.

 

[telectrix]

Thanks. Thought it may be that. Excuse my lack of forum manners.. I'm new to this.

it's possible that there is a fault on the installation and some donut has dissed the bonding. thorough testing before you change the CU is advised.

 

[Taylortwocities]

Its in your interest. New topics get looked at by everyone.
Old one often only get noticed by anyone who contributed to the old topic (assuming they are still alive).