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Couple of quick supplemental bonding questions

Discussion in 'Electrics UK' started by Paul_Thomas, 6 Oct 2007.

  1. Paul_Thomas

    Paul_Thomas

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    As part of our new extension we have a shower room (with shower, wc, basin and towel rail) and a en-suite wc (toilet, sink and towel rail).

    I have notified BC that I am installing the electrical work, they are inspecting 1st fix and getting somebody to test afterwards.

    Q1
    I appreciate that I have cross bond between all of the pipes etc, but do I have to take one of the 4mm earths back to a earth (in the light for example) - I have seen conflicting information on the internet about this point.

    Q2
    What should I do about bonding for the shower? (it's a mixer shower)

    Q3
    Is it a requirement to install suplemental bonding in a en-suite wc room?
    [/b]
     
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  3. JohnD

    JohnD

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  4. Adam_151

    Adam_151

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    with q1, you are looking at the issue the wrong way round, think of it not as taking the bond back to earth, but bonding all the cpcs just as you bonded the pipes as these too can introduce potentials to the zone.
     
  5. Paul_Thomas

    Paul_Thomas

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    Thanks guys for the replies.

    How would you normally bond the shower pipes, as they are buried in the wall and I believe the earth bonding points are supposed to be visible.

    I hadn't apprciated that all circuits in the room had to be bonded together as well, although I guess this is only really the lighting circuit anyway!
     
  6. TicklyT

    TicklyT

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    As JohnD said, you only have to bond each pipe once. If the hot and cold supplies are bonded (where they enter the room, for example), there is no need to bond them again at the shower valve.

    The object of supplimentary bonding is to ensure all metalwork entering the room is at the same potential, not necessarily at true earth potential.
     
  7. Paul_Thomas

    Paul_Thomas

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    Would I get away with bonding the pipes under the sink, which also feeds the shower at the opposite side of the wall? (All pipes are under the floor)

    Should I also bond the cold water pipe to the WC?
     
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