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Fuse blowing

So just now I was adding an extra light over my day bed  it's a vintage 60 watt bulb looks like an old radio valve it even has the little glass pip on top. Anyhow as I was wiring it up two whiskas of wire touched there was barely any sound but it popped the 5 amp fuse in the plug adaptor and tripped 16 amp MCB how is this even possible even under partial short circuit conditions surely a 5 amp fuse should clear before a 16 amp  MCB?
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  • John Peckham:

    I have seen recently a sparks drilling a hole in trunking hit a cable inside and blow the MCB on the board and the MCCB back at the main panel. He also needed a new drill bit.




    Please allow me to rephrase that.


    I stood there with my hands in my pockets watching a sparks drill through a live cable. ?

Reply

  • John Peckham:

    I have seen recently a sparks drilling a hole in trunking hit a cable inside and blow the MCB on the board and the MCCB back at the main panel. He also needed a new drill bit.




    Please allow me to rephrase that.


    I stood there with my hands in my pockets watching a sparks drill through a live cable. ?

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