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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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  • Concerning selectivity, that is all for faults of negligible impedance, so perhaps faults of not so negligible impedance behave differently?


    Concerning GU10s, filaments blew much more often than standard (non-halogen) ones. CFLs seemed to go dim before failing far too soon. LEDs have been much the best - I don't think that I have had to replace one yet.
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  • Concerning selectivity, that is all for faults of negligible impedance, so perhaps faults of not so negligible impedance behave differently?


    Concerning GU10s, filaments blew much more often than standard (non-halogen) ones. CFLs seemed to go dim before failing far too soon. LEDs have been much the best - I don't think that I have had to replace one yet.
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