Lights keep tripping... | on ElectriciansForums

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N

Newbie90

Hi all

Has anyone got any ideas why a lighting circuit would randomly trip the mcb?

The maximum Zs tested was 1.07 ohms.

Its only ever happened (3 or 4 times) when the 2 wall lights in the front room are switched on. They both have energy saving light bulbs and none of them ever blow.

It doesn't trip the rcd, just the mcb.

Thanks
 
Do energy saving lamps ever cause nuisance tripping?

I did a full insulation resistance test on the individual circuit and measured >299 on L - N, L - E and N - E.

The only other possibility is that the tv amp has been tapped off the lighting circuit but that has a perminant feed and not being switched.
 

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