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Melted Terminal Block - Why?

Sebastian J

Hi all,

I opened a junction box this morning to find the terminal strip inside had melted.

It appears the actual block for the neutral has completely melted. The block was joining modern PVC/copper cable to tin-plated VIR cable. The block itself is copper.

I've attached some images. (The other screw/half crumbled/fell away and I can't find it.)

What could have happened here?

I am guessing a poor connection that deteriorated over time, but why has the molten copper turned a silver colour? And why did the block melt but the screw just charred?

Could there have been some kind of chemical reaction that caused the failure?

Sj

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