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My kitchen light seems to trip the house ring main trip when switching the light off. I have replaced the switch. But sometimes about once a month same thing happens. The lighting elcb does not trip.

  • So presumably you are in the UK. Is the lighting circuit a branch off the main ring? Or is this light plugged into a receptacle in the main ring and the light has an elcb (aka in USA as GFCI ?) in the plug of its cord? Is the main ring breaker 30-A 230 V and does it have ELCB (aka in the UK as RCCB) function? Can you tell when the main breaker trips if it is over-current or RCCB that is causing the trip? Some reading cycloflow.com/2014/03/why-doesnt-uk-use-afcis.html#guess. – Jim Stewart Nov 29 '16 at 10:48
  • Is the kitchen lighting circuit a radial circuit which goes back to the service panel (called 'consumer unit' in the UK) and so is not fed from the 'ring mains' circuit? – Jim Stewart Nov 29 '16 at 11:41
  • Is it a switch-start fluorescent fitting? (is there a plug-in starter in the side?) – RedGrittyBrick Nov 29 '16 at 14:37

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