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Thread: Bonding

  1. #1
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    Bonding

    Hi All
    Here is something I thought I knew.
    Do all pipes at toilets basins and so on have to be bonded if the geyser hot and cold pipes are bonded and one gets a 0.2 ohm reading or less at all the mentioned pipes
    Regs 6.13.2.2 and 7.1.3.3

    Thanks

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  2. #2
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    Hi

    Took a bit of reading and rereading along with a discussion in the workshop
    When there where Municipal inspectors they used to insist on seeing a earth wire and copper clamp on the water pipes. They often refused to pass the job as 2,5sqmm Twin and Earth to a geyser has a 2sqmm earth wire , not 2,5sqmm.

    Then the actual earth wire/ bonding strap fell away with the introduction of note 2

    Having a read on 7.1.3.3 it appears that that earth wire shall be installed has now come back - It does not state that it must be at the point in the Zone and we read it that it could be in the ceiling space next to the geyser .

    Have pasted the regulations below for ease of discussion.

    One question we are still under debate on is - what if the water pipes are pvc and the taps metal ? do we need to get a separate earth wire to the tap.



    6.13 Bonding
    NOTE 1 The aim of bonding is to bring all the bonded parts to the same electrical
    potential.
    NOTE 2 No external conductor is required if compliance with the requirements for
    continuity can be proved by the test in 8.6.2.


    7.1.3.3 Supplementary equipotential bonding
    All accessible conductive parts in zones 1, 2 and 3 that may become alive
    accidentally, though not normally forming part of the electrical circuit, shall
    be bonded with a local supplementary equipotential bonding conductor,
    except where the conductive parts are protected by insulating covering or is
    otherwise enclosed. The resistance of the earth continuity circuit to earth
    shall not exceed 0,2 Ω.

  3. Thanks given for this post:

    Gtfast (05-Mar-19)

  4. #3
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    Thanks GCE.
    Would local supplementary bonding conductor not mean it has to be at the point where the pipes are exposed.
    What would happen where for egsample a toilet pipe is a distance away from other pipes.





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  5. #4
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    Hi

    Came across the clause pasted below which solves my tap issue but I am still uncertain with regards to the exposed pipes and the wording Local

    7.1.5.2 If the following are electrically isolated from earth, they need not be
    earthed:
    a) metallic baths and basins;
    b) metallic waste fittings in baths or shower trays; and
    c) other isolated metallic parts.
    NOTE A bath or basin is said to be isolated from earth if the waste pipes are nonmetallic
    and the taps are
    a) wall mounted, or
    b) bath or basin mounted and supplied by non-metallic piping.

  6. Thanks given for this post:

    Gtfast (13-Mar-19)

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