Supplementary bonding

[sleepy]

I have just replaced the radiator in bathroom and noticed there is no bonding on pipework. Hot and cold water pipes and metal bath are all bonded. As the bathroom is protected by RCD, if the resistance between the radiator and the cpc is less then 1667 ohms then no supplementary bonding is required. Am I correct?

 

[Theorysparky]

What is the resistance reading between the radiator pipes and the hot/cold pipes ??

The bonding of the radiator should be to the other pipes....

 

[Revved Up Sparky]

If there is a Main Protective Conductor clamped onto the services (within 600mm of entry where practicable) then any such reading between cpc and radiator will be very low- almost zero. In fact if a) all final circuits of the location comply with the requirements for ADS, B) all final circuits of the location have RCD protection and c) all extraneous- conductive parts are effectively connected to the aforementioned Main Protective Conductor/s then supplementary bonding is not required (check 701.415.2).

 

[steptoe]

even under 16th it was very seldom required for bathroom rads to require bonding,

a lot of people only done it for one of 2 reasons

A they didnt understand when it required bonding, and under what resistance it should be

B monkey see, monkey do,

I have never in my life bonded a bathroom radiator except where specified by the company/person ordering the work.

 

[kerching]

Back in the day....if it was required to bond a Rad we were advised [by an Architect flipping flipper] to drill the bottom flange/seam of the Rad and fit a nut and bolt!

I asked him to demonstrate as I could not understand him!!, gave him a drill, nut, bolt and sat backed and wet myself...not as wet as he was though! See my previous posts on Architects and what the word actually means. I love baiting them, top sport............... :coat

 

[sleepy]

On checking resistance between hot & cold pipes and radator, found very high. Did a physical check of central heating system and found that although pipes where bonded going into combi boiler I found that the cental heating pipes leaving the combi passed through ceiling, two plastic connecters where used, so none of central heating pipes or radiators are bonded/earthed.

 

[froria]

Back in the day....if it was required to bond a Rad we were advised [by an Architect flipping flipper] to drill the bottom flange/seam of the Rad and fit a nut and bolt!I asked him to demonstrate as I could not understand him!!, gave him a drill, nut, bolt and sat backed and wet myself...not as wet as he was though! See my previous posts on Architects and what the word actually means. I love baiting them, top sport............... :coat

Brilliant!