Earth Bonding On A Worchester Combi Boiler

[vicvapour]

As mentioned above the gas pipe is definitely earthed its right next to the meter.
But we are still confused about the other pipes needing earthed would it be ok to link all the other pipes to the gas pipe at the boiler?

And would this then make them all earthed?

The consumer unit is a old one that still use's wire not rcd breakers.

Thanks again Steve

Supplementary bonding is not earthing. The objective is not to create a new earth path because that is what the earth in the mains cable is doing. Linking all the pipes to the gas pipe might make it a 'better' earth than the cable and I don't think that is a good idea.

The objective of supplementary bonding is to ensure that all exposed metal parts, ie. taps, etc are at the same voltage if there is a fault. Then you don't become a conductor if there is a fault and you touch both parts. As has been said it's not needed any more on modern installations.

Since your CU is so old you need to ask an electrician.

This is not actually the case

Any alteration or addition to an existing installation must comply with the current edition of BS 7671 (including any amendments). This requires any earthing and bonding arrangements upon which the alteration or addition relies for safety to be adequate.


Regulation number(s)
BS7671
132.16
633.2
411.3.1.1

 

[dumbrill]

As has been said it's not needed any more on modern installations.

This is not actually the case

Any alteration or addition to an existing installation must comply with the current edition of BS 7671 (including any amendments). This requires any earthing and bonding arrangements upon which the alteration or addition relies for safety to be adequate.


Regulation number(s)
BS7671
132.16
633.2
411.3.1.1

Can you give some examples of modern, ie. 17th edition installations in which supplementary bonding would be required?

 

[vicvapour]

As has been said it's not needed any more on modern installations.

This is not actually the case

Any alteration or addition to an existing installation must comply with the current edition of BS 7671 (including any amendments). This requires any earthing and bonding arrangements upon which the alteration or addition relies for safety to be adequate.


Regulation number(s)
BS7671
132.16
633.2
411.3.1.1

Can you give some examples of modern, ie. 17th edition installations in which supplementary bonding would be required?

Where a required disconnection time cannot be achieved, supplementary bonding shall be applied.

So for example, if there is no evidence or indeed a reading of continuity greater than 0.5 ohms for an earthing conductor that terminated in the MET for a gas pipe or water pipe, then supplemtary would be required to be used.

The Cross Sectional Area of the conductor to be used will be in referenced to table 4.3 of the On-Site guide, or the BRB.

Hope this helps.