Bonding Q

[RickH]

On my house I had boiler with earth bonding to gas pipe at boiler.
When boiler was replaced, the GasSafe fitter removed bonding cable advising regs no longer requires this as copper gas pipe provides the earth.
OK …. I thought odd, but they signed off safety so I accepted it.

On a rental property which also has a gas pipe bonded at boiler, the certificate has a comment that “incorrect size bonding cable use”
As this also has a contiguous copper pipe to gas meter (which is bonded) ….why is it required in one house and not in the other?

 

[muggles]

Bonding should be within 600mm of the meter and before the first junction, on all properties. It's not required at the appliance

 

[Jurassicspark]

Pictures?

 

[Murdochcat]

On a rental property which also has a gas pipe bonded at boiler, the certificate has a comment that “incorrect size bonding cable use”
As this also has a contiguous copper pipe to gas meter (which is bonded) ….why is it required in one house and not in the other?

What certificate is that?

 

[Murdochcat]

Bonding should be within 600mm of the meter and before the first junction, on all properties. It's not required at the appliance

Not sure I agree with that.

IIRC its within 600mm of the gas pipe entering the building wherever practical ...............

 

[denso13]

why is it required in one house and not in the other?

Only required if the incoming service is an extraneous conductive part. The gas person should really have referred it to a competent person if unsure.

 

[RickH]

What certificate is that?

Landlord Gas Safety Record

 

[RickH]

Only required if the incoming service is an extraneous conductive part. The gas person should really have referred it to a competent person if unsure.

He just put a comment in the 'Landlord Gas Safety Record' that boding conductor is insuffienct size .... and a photo of erath bonding wire ion boiler.
As I understood (and confirmed above as gas is primary bonded at the meter (within 600 mm of entry) there is no need for this bonding at appliance. Gas pipe is contiguous copper form from the meter to boiler.

 

[denso13]

there is no need for this bonding at appliance

Correct, not required.

 

[endecotp]

“incorrect size bonding cable use”

It's worth noting that the required size of the earth wire at the incoming gas pipe has increased at some point in the past, and many properties will now have wires that are thinner than current regulations require. Was your report definitely referring to the connection at the boiler, not at the incoming pipe / meter?

 

[RickH]

What size conductor is required ? As you say may now need to be larger, I can check when I visit.

 

[EFLImpudence]

10mm².

 

[RickH]

Pictures?

There were 2 pictures attached to the certificate - one entitled 'gas test' showing manometer, the other pic of the top of the boiler entitled 'as left'

 

[RickH]

It's worth noting that the required size of the earth wire at the incoming gas pipe has increased at some point in the past, and many properties will now have wires that are thinner than current regulations require. Was your report definitely referring to the connection at the boiler, not at the incoming pipe / meter?

Interesting that there was a full EICC test & certificate last month, no mention of any bonding issue.

 

[endecotp]

Interesting that there was a full EICC test & certificate last month, no mention of any bonding issue.

There should be a box on the form for something like "bonding of extraneous conductive parts - gas". What does it say?

It's hard to tell from your photo but I'd be a bit surprised if the wire in your gas meter photo is 10mm².