this post was submitted on 12 Jan 2025
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Electricians

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Post mortem - What was the cause? (feddit.nl)
submitted 3 weeks ago by [email protected] to c/[email protected]
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I want to know what do you think?

What was probable cause?

Before that, for last 2-ish years I must replaced 5 LED bulbs.
No other symptoms.

Right before failure, one or two LED bulbs started blinking. I heard "scorching" sound.
And smell of burned electric/electronic (isolation).

Then I disconnected all circuits and opened all surrounding boxes...
Over-current breakers or RCD/GFCI didn't tripped.

Extra photos:

(ignore temporary jumper - fixed now)

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[–] [email protected] 1 points 3 weeks ago* (last edited 3 weeks ago)

Now the big question is, why didn’t the breaker trip on its own?

Not enough angry pixies to trip a breaker I think.
16 A, so at least 3.5 kW power needed → block with loose connection will burn, not melt.

Summary

Avoid Legrand brand at all cost:

  • block bus screws are shit, soft metal
  • 3 separated block bus, metal link(s) are not provided

.

About consumer unit:

  • "hot" phases: link cables used instead of bus bars
  • maybe second neutral cable should be used instead of wire link
  • no one checks wiring inside unit; only RCD/GFCI is checked

.

I had a small UPS on top of the unit - shit...