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Old Dark Coloured 30 Amp. M.C.B. Tripping.

Zoomup
Like these but in 30 Amp rating.

https://www.ebay.co.uk/itm/Mem-5A-15A-M1-Old-style-MCB/283439020125?hash=item41fe48385d:g:Jf8AAOSwhPpdQcvp


I had a job today which I completed, but when the house owner turned on his t.v. and computer the 30 Amp M.C.B. tripped off. I reset it but it seemed graunchy and rough. It did not seem to reliably reset and appeared to be holding just on a "knife edge". Probably not used for years and corroded inside or full of house mites. 


Has anyone had one of these become oversensitive?


Z.


  • 0
    I had something similar a few years ago, a call back to a kitchen job because the obsolete MCB was tripping, I load tested it using a clamp meter and kitchen appliances and found it tripped when under loaded, so I swapped it for the MCB to the lightly loaded upstairs socket ring circuit and left having told the customer it was their problem.


    Andy B.
  • 0

    Sparkingchip:

    I had something similar a few years ago, a call back to a kitchen job because the obsolete MCB was tripping, I load tested it using a clamp meter and kitchen appliances and found it tripped when under loaded, so I swapped it for the MCB to the lightly loaded upstairs socket ring circuit and left having told the customer it was their problem.


    Andy B.




    I told my customer that if it keeps tripping off that I can replace the small 3 way consumer unit with a new one and new M.C.B.s, as the old one carries obsolete M.C.Bs. and I would not trust a second hand fleabay one.


    Z.

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