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?
I have no idea what sort of impedance my fault had it was just a few strands of copper wire which accidentally contacted the opposite wire. Maybe it serves me right for working live I guess. Ancient mariner there was no other load on that MCB as it serves only a double socket in the disco room which is where the day bed is. I have read on another forum that there is an arc form when the bulb filaments break and acording to some measurements made currents of several hundred amps can flow for a few cycles so not surprised it trips the MCB. Why ever did they stop putting Ballotini fuses in bulbs. Incidentley does anyone know was Ballotini the name of the Italian who invented them? That name sounds Italian so guessing he was. Are those LED lights you have fitted with switch mode supply's or simple capacitive dropper ?
I have no idea what sort of impedance my fault had it was just a few strands of copper wire which accidentally contacted the opposite wire. Maybe it serves me right for working live I guess. Ancient mariner there was no other load on that MCB as it serves only a double socket in the disco room which is where the day bed is. I have read on another forum that there is an arc form when the bulb filaments break and acording to some measurements made currents of several hundred amps can flow for a few cycles so not surprised it trips the MCB. Why ever did they stop putting Ballotini fuses in bulbs. Incidentley does anyone know was Ballotini the name of the Italian who invented them? That name sounds Italian so guessing he was. Are those LED lights you have fitted with switch mode supply's or simple capacitive dropper ?
