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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.

Parents
  • 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. 

Reply
  • 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. 

Children
  • 0 in reply to broadgage

    Thanks. Yes as you would presume that the faulty appliance would arc to the earthed metal casing of the appliance as it should be the path of least resistance. The Zs was around 0.3 ohms though from the cooker plate line to the hob metal casing.

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