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  • Electrically-heated shower? 10A won't be enough for one of those (even on 230V I have a 30A breaker for mine), so how's it connected? Breakers, like most components, can fail in various ways, some more likely than others. An old design in a country where electrical standards are weak could easily have failed closed, even though Siemens know how to make things properly.
    – Chris H
    Commented Jul 4 at 13:46
  • Insulation melting on a wire can be from a loose connection. The loose connection causes heat, melting the insulation. It might not even trip a new breaker, if the amps do not go much above the breaker rating.
    – crip659
    Commented Jul 4 at 13:58
  • " My lights began flickering when the shower was on" is pretty scary.
    – Wastrel
    Commented Jul 5 at 14:31
  • For interest, what country?
    – Russell McMahon
    Commented Jul 6 at 11:21
  • 1
    Because breakers are not "Everything Detectors". You had series arcing and you did not have an Arc Fault Detector installed. Eaton has taken a swing at making an Everything Detector, but only in the US market and only on 120V 15-20A circuits. However, we Yankees know why this happened. We have the science to prove that screw torque matters on all terminals. As such, we require torque to be set with a torque setting tool.
    – Harper - Reinstate Monica
    Commented Jul 6 at 21:12