1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Cable sizing for a shower waste pump

Discussion in 'Electrics UK' started by primetime, 20 Sep 2015.

  1. primetime

    primetime

    Joined:
    20 May 2013
    Messages:
    95
    Thanks Received:
    2
    Location:
    Bristol
    Country:
    United Kingdom
    Hi All,

    Reading through some online installation instructions for shower waste pumps they dob't specifically state what x section cable to use. If given the following information for example, what would be the minimum sq mm? Thanks.

    '230V AC power supply must be provided with a two-pole isolator switch and a dedicated circuit with a 30mA RCD device installed in accordance with the latest revision of the IEE wiring regulations BS7671. It must be wired into a fused, unswitched, fixed wiring connector fitted with a 5amp fuse'
     
  2. Sponsored Links
  3. EFLImpudence

    EFLImpudence

    Joined:
    7 Jul 2010
    Messages:
    35,750
    Thanks Received:
    3,996
    Location:
    Retired to:
    Country:
    Portugal
    1mm² T&E will be more than adequate. Minimum 0.75mm² flex from FCU to unit.

    Having said that, there is a very obscure regulation which states that 1.5mm² is the minimum allowed for power circuits - but no one knows what a 'non-power circuit' is.
     
    • Thanks Thanks x 1
  4. Steve

    Steve

    Joined:
    15 Apr 2005
    Messages:
    16,478
    Thanks Received:
    244
    Location:
    Yorkshire
    Country:
    United Kingdom
    Don't macerators come with a flex attached?
     
  5. PrenticeBoyofDerry

    PrenticeBoyofDerry

    Joined:
    30 Jun 2009
    Messages:
    21,628
    Thanks Received:
    2,383
    Location:
    Londonderry
    Country:
    United Kingdom
    Everyone I have fitted has!
     
  6. DaveHerns

    DaveHerns

    Joined:
    11 Nov 2009
    Messages:
    2,582
    Thanks Received:
    207
    Country:
    United Kingdom
    Two pole isolator and unswitched seem to contradict one another
     
  7. primetime

    primetime

    Joined:
    20 May 2013
    Messages:
    95
    Thanks Received:
    2
    Location:
    Bristol
    Country:
    United Kingdom
    I was looking at the AKW and Whale instructions. That description was from AKW however the diagram only shows the 13A isolator. Will leave it up to the sparky but was curious to know what was needed, where to position etc.

    Thanks for the replies.
     
  8. JohnW2

    JohnW2

    Joined:
    28 Jan 2011
    Messages:
    46,696
    Thanks Received:
    3,013
    Location:
    Buckinghamshire
    Country:
    United Kingdom
    I presume that what they are saying is that there should be a 2-pole isolator 'somewhere', but that the point of connection should be unswitched (to reduce the risk of it being switched off accidentally).

    Kind Regards, John
     
  9. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  10. Sponsored Links
Loading...

Share This Page