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Post mortem - What was the cause? (feddit.nl)

submitted 2 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] 11 points 2 weeks ago (1 children)

Came here to say this.

This is why it's a bad idea to put stranded wire directly in a screw terminal. over time the bundle squishes and the connection sparks and overloads. If only the installer had put a ferrule on the other end.

[–] [email protected] 3 points 2 weeks ago (1 children)

There are remnants of a ferrule on the other end.

[–] [email protected] 2 points 2 weeks ago

Yeah.