RCD Tripping - Electric Oven

Discussion in 'Electricians' Talk' started by kathekas, Nov 12, 2018.

  1. kathekas

    kathekas Member

    Hi

    We have a rental property and the tenant complained that when they switched the oven on it tripped the RCD protecting the property.

    Suspect it being a problem with the oven we had a new oven installed.

    For a short while this solved the problem.

    The problem had recurred. If it was a circuit/RCD problem why did the new oven solve the problem short term?

    Many thanks.
     
  2. retiredsparks

    retiredsparks Super Member

    Old oven..poss more leakage
    New oven..poss less leakage.
    You may have a standing earth leakage on the system due to damp etc...(say 27 mA) which will cause problems.
    OR..a 'twitchy' RCD(technical term..lol)
    Only way is to get the installation tested correctly by an experienced sparks.
    Hope you havent thrown the old oven ?:)
    RS
     
    kathekas likes this.
  3. This is where having an all RCBO board earns the little bit of extra outlay.You would only have the cooker circuit tripping and all other circuits would still be on.
     
    kathekas and Comlec like this.
  4. retiredsparks

    retiredsparks Super Member

    Agreed now that the prices are reasonable.
    It was hard enough a few years ago to encourage customers to even change the board, never mind pay 3 or 4 times more for materials.
    Had one customer say..
    I cant afford a new fuse board..I have booked 3 holidays for this year.
    RS
     
    kathekas likes this.
  5. kathekas

    kathekas Member

    Just been to the property and been doing superficial testing.

    All appliances unplugged from sockets, all fixed appliance turned of as installation switch.

    The installation is a split board with 2 RCDs.

    On one side there are 2 lighting circuits, water heat (peak) and cooker.

    The oven is fed from cooker circuit.

    With the 2 lighting circuits and water heater circuits turned off at the board:

    With the hob not switched on at the appliance the oven was turned on and after about 1-2 minutes as it warmed up the RCD tripped.

    Does this not indicate its a fault with the oven?

    Thanks
     
  6. Comlec

    Comlec Screwfix Select

    Isolating the circuits appliances only disconnects the line (live) and the neutrals and earths remain connected. A fault between N and E will cause an RCD to trip.
    You also need to test the RCD to ensure correct operation.
    So before you blame the new oven get the circuits properly tested.

    Also, just as a comment, on a split board it is usual to have the lighting circuits distributed over both sides.
     
    kathekas likes this.
  7. kathekas

    kathekas Member

    Many thanks - I will take all the advice on board and get quotes for the recommendations.
     

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