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AAaaahhhhh. The Bonding Question Again.

Zoomup
Do we main bond up an installation if a new gas boiler is to be installed when the old one is removed?


What are extraneous-conductive-parts, and what are not?


Now, to put a spanner into the works, do any issues arise if the copper pipes are "bonded" with solderless copper bonding?


Otto von Guericke would have known this for sure.


Over to you?


Look......




Z.


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    Chris Pearson:




    Zoomup:

    Now, to put a spanner into the works, do any issues arise if the copper pipes are "bonded" with solderless copper bonding?



    Leaks I should think. Who in his (or her) right mind would glue water pipes together? ?

     




    Back in the 1970’s I was doing some plumbing in a large country house that st one time had belonged to the Players who made cigarettes, then had been a boarding school and during the war a military hospital, before becoming a family home again.


    Under the floors were a ridiculous amount of pipes from when it had been a school and hospital with communal washrooms and bathrooms. There were lead gas pipes that distributed gas from an acetylene bank that had been by the back door, as well as lead, copper, cash iron and black mild steel with all sorts of fittings.


    However the section I was working on was thick copper pipe with gunmetal fittings screwed together with a gene thread. I asked the customer for the key to his workshop to let myself in to use the bench grinder to thin a piece of the thick down so I could solder a modern copper end feed coupler onto it to use so an adapter.


    The customer was really impressed and said the previous guy who had worked on the plumbing in the house had glued fittings on with Araldite. There were several places where this had been done and I ended up with the job of making adapters yo replace those as well.


    Andy Betteridge 

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    O.K. Hands up who bonds earthy extraneous-conductive metal radiator pipes at each location where they emerge from the ground  floor, say from concrete or from under quarry tiles? 



    I'd want to be convinced that it was effectively bonded (if really extraneous - modern concrete floors should have a plastic DPM underneath them) - I'd probably consider that being buried in an internal solid floor would be sufficient precaution against the joints being modified (e.g. being replaced by plastic or glue) so if there was continiuity now, I'd be happy just bonding one end (e.g. where it goes down into the floor near the boiler) rather than where it emerges at each of the radiators. Joints accessible 'above ground' I wouldn't want to rely on. Yes I have bonded CH pipework for that reason - even though it didn't exter/exit the premises.


    Judging by the bonding in a utility room I saw the other day, where the same lead water supply pipe was bonded in both places it emerged though the floor, others (at least one) seem to think similarly too.


      - Andy.
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    OMS:

    Do you test them, Z ?


    OMS




    Testing is very important. 131.1 is concerned with safety to persons, livestock and property. So, yes I do test as required to ensure safety. I come across oil boilers that are fed from oil storage tanks in gardens some distance away, perhaps up to 30 or 40 metres in some cases. The oil feed pipe can then appear as a bare copper pipe or may be a copper pipe inside a plastic protective pipe, but the copper pipe is exposed at the ends. At the house a fuel filter is installed on the outside of the house at low level, the bare copper pipe then enters the house through a wall or underground. I definitely main bond the copper pipe at the entry position. This copper fuel pipe may test as non-extraneous but in damp or wet conditions may test as an extraneous-conductive-part.


    An I.E.T. publication once suggested that dry radiators yet to be filled with water may test as a non-extraneous-conductive-part, but once filled with water and rust inhibiting chemicals may become an extraneous-conductive-part, even if fed by plastic pipes, so testing dry may give different results to testing when filled.


    Safety first.


    Z.







    Z.

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