Bathroom RCD light switching

Discussion in 'Electricians' Talk' started by Mnw, Oct 10, 2018.

  1. Mnw

    Mnw New Member


    Can someone more knowledgeable than me tell me which of the following setups is correct / most advisable?

    I'm upgrading some bathroom lighting and want to know if my light switch should operate on the feed to the (required) RCD OR operate on the load coming from the RCD?

    Many thanks

    Attached Files:

  2. Risteard

    Risteard Well-Known Member

    Are you competent to be carrying out this work?
  3. spirits are real 2016

    spirits are real 2016 Active Member

    haven't you got a RCD in your consumer unit protecting your circuits.
  4. Bazza

    Bazza Well-Known Member

    Have you?

    Have a think about these two teasers:.
    1. Why do bathroom circuits in particular need RCD protection?
    2. Switch
  5. Mnw

    Mnw New Member

    More granular tolerance of tripping on SELV circuit
    Yes, i'd like to be able to turn the light off.

    CAn anyone answer A or B?
  6. Bazza

    Bazza Well-Known Member

    I agree with Risteard. With that level of knowledge you are a danger to yourself and others.
    Please get someone who knows what they are doing to carry out this work.

    How about an answer to this?
  7. Mnw

    Mnw New Member

    Ok, so assume the question is purely hypothetical.
    Which is the correct answer?
  8. Hans_25

    Hans_25 Active Member

    Ask yourself if RCD devices need to be permanently powered in order to remain in the "on" position (think about where RCD devices in the CU are located in the circuit), and then consider the most appropriate location of the switch.
    Bazza likes this.
  9. retiredsparks

    retiredsparks Well-Known Member

    Where are you situating the RCD ?
  10. Bazza

    Bazza Well-Known Member

    There may be one in the hypothetical consumer unit. We haven’t had a hypothetical answer to this yet.
  11. Mnw

    Mnw New Member

    Yes, assume the hypothetical consumer unit is RCD protected.
  12. Bazza

    Bazza Well-Known Member

    So look at your drawings and decide which is the right one.
  13. retiredsparks

    retiredsparks Well-Known Member

    Stop playing with 'hypothetical' electrics.
    Take up a sensible collecting car number plates....on the M4.
  14. Mnw

    Mnw New Member

    How should I collect number plates on the M4?

    Which part of the M4 are you talking about?
    What sort of number plates are you planning to collect?
    Are you qualified to collect number plates on the M4?

    Thanks folks!
  15. Bazza

    Bazza Well-Known Member

    You’ve answered a question with three more questions.
    This is a bit like Wednesday lunchtime in the House of Commons!
  16. retiredsparks

    retiredsparks Well-Known Member


Share This Page