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Induction hob spark fault

Jimi

Went to a call out. I was told that the induction hob sparked while in use which tripped the RCD. It's a hob and oven on a circuit together. Apparently the same thing happened before (last year I think) so the hob and oven were replaced (student property). Any ideas what may have caused this? The only thing I thought of was loose connections (causing an arc which creates a surge in the hob?). The cooker plate connections were loose so I tightened them. Any other ideas? Maybe:

Loose connections or cable damage (limiting the current flow to the appliance or creating arcs?)

Faulty appliance

Incorrect polarity?

Incorrect voltage?

Thanks.

  • 0 in reply to mapj1

    I've never heard of this. The cooker connection unit / plate Zs was 0.28 ohms. Then there was 240V between line and the metal casing of the hob and oven showing it is connected to earth / cpc. Doesn't the Zs reading prove the earth fault loop path...hold on I think I get you...as in the earth connection at the distributors transformer could be broken? So you test from true earth to make sure? It could just go down the boding though to gas and water? You disconnect these?

    They just said the hob sparked when they were using it and it tripped the RCD. Why would no earth connection cause a spark anyway out of interest?

    Just had an email from the company - “Half of the hob isn’t working following a visit from the electrician and when we try to turn the stove off at the switch there is a sparking noise”

  • 0

    Could be almost anything from static electricity at the harmless end , up to the horrific possibility that the house is off-earth, and the whole lot floats relative to true earth. Where was the spark, and did anyone get a shock off something and if so what ?

    Eliminate the worst possibilities by bringing a wander lead in from true earth (screw driver in the lawn style, and verify that the cases of the units are really at earth voltage not just connected together) Then check  between the MET  and all the things that should be earthed .

    Mike

  • 0

    Faulty appliance, possibly IMHO.

    Incorrect polarity, most unlikely, there are still supplies in Europe with BOTH sides live. And polarity is a bit random in other places, standard appliances are used in such places. And of course in the USA 208 volt or 240 volt circuits have both sides live.

    Incorrect voltage, most unlikely as such appliances are sold internationally including places where the voltage varies varies a lot more than it does here.

    In student housing do not ignore the possibility of misuse or rough use. Try to find out WHAT EXACTLY arced. Any arcing outside the appliance suggests a faulty appliance AND lack of earthing/bonding. 

  • 0

    What actually sparked?

    Z.

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