gas meter earthing

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kenr0991

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Just like to say hi to everybody first as i am new to this forum.

Hoping somebody out there can help me with the following query.

House has just been rewired, however my gas meter is situated outside at the front of the house.

This has an earth electrode attached about 600mm after the tap inlet, is this adequate to satisfy 17th edition, or must i disconnect this and run a 10mm earth cable back to the suppliers earthing link.

OR, have the earth electrode and also connect an earth cable back to supplers earth link.

Yous in anticipation
kenro991
 
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To clarify, you mean earth electrode as in an earth stake hammered in the ground?
 
You say there is a supplier's earth link, so I assume an earth electrode does not supply your main earth?
 
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How has the water supply been earthed?

Would it have been difficult for the electrician to have run a 10 mm from the mains to the gas supply? Doesn't seem very good...
 
I've seen this a few times before.
Have been told it was done on a Warm Front Gas heating job. on TN systems instead of main bonding.

Obviously by someone who does not know their Amp from their Elbow.

Seems they think that an Earth is an Earth is an Earth so to speak.
Clueless.

Not only is it not fulfilling requirements but could also be creating a potential danger where none previously existed.
 
Also, to add to ebee's comments, it doesn't help when those both asking for and giving out advice don't understand the terminology they are using. :rolleyes:
 
This is dreadful!

There could now be a pd between the gas pipe and the rest of the installation.

All PEB's must be connected to the MET.
 
securespark said:
There could now be a pd between the gas pipe and the rest of the installation.
Click to expand...

There is often a pd between the gas meter ( bonded to MET ) and the ground. Slight tingles being felt by meter readers if they touch the meter.

This is what happens when one extends the equipotential bonding to something outside the house and into close proximity to the real ground.

The equipotential bonding makes it safer (?) inside the house no matter what voltage happens to occur on the "earth" imported from the electrical supply wire. That is only true provided the house structure does not allow any possible connection to true ground to enter the house unless it is bonded to the (false) "earth" of the electricity supply via a cable able to carry heavy currents. How soon will it be before incoming telephone cables from the exchange have to be bonded to the MET.

This false "earth" on gas pipes seems to be a point of concern as page 18 of the nationalgrid booklet "Step-by-step guide to altering your gas service pipe" has a diagram showing a requirement to fit an insulation joint in the pipe before the meter and then the pipe up-stream from the insulation joint "to be wrapped to provide electrical insulation. Oddly it seems OK for the the meter and the mounting plate to remain un-insulated as these are the parts that the meter reader is likely to touch.
 
sparkwright said:
How has the water supply been earthed?

Would it have been difficult for the electrician to have run a 10 mm from the mains to the gas supply? Doesn't seem very good...
Click to expand...

Sorry Sparkwright i was in the middle of replying to your question when my computer crashed, have just got up and running again.

Anyway back to the subject. The water supply has been connected with 10mm earth cable from just after the stopcock back to the suppliers earthlink.

Re-the gas i think the supply used to be in the house but for some reason re-sited outside probably hence the earth electrode rather than run a cable right through the house.

i have run a 10mm earth cable through the house from gas inlet to the suppliers earth link (as house is empty at the moment) but have not connected it. As unsure whether to connect it with earth electrode (stake) already connected.
 
Assuming the gas meter is in a standard wall-mounted cabinet (either recessed, semi-recessed or surface-mounted) then it should be OK to fit a bonding strap to the pipe inside the cabinet (within 600mm of the meter) and run the cable back to the MET.

If you prefer, you could connect the strap to the gas pipe where it enters the property (inside), as long as this is accessible.
 
securespark said:
Assuming the gas meter is in a standard wall-mounted cabinet (either recessed, semi-recessed or surface-mounted) then it should be OK to fit a bonding strap to the pipe inside the cabinet
Click to expand...

The nationalGrid state their prefered position for the bond is in the house, in the meter box is the non prefered position
 
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