Tonights Callout.

[Snapester]

Got called out to a burnt out fuse carrier on Wylex rewireable CU! Classic! It was a 1361 carrier with a 30amp fuse that hadn't blown but the board was melted pretty good!
R1+R2 the circuit to find out which one it was, located it to the shower circuit, which tested good 0.11 from board to shower, but the isolation switch was broken possibly burnt out i expect having never been turned off in its life duration.
No signs along the circuit of over heating although the cable was 4mm undersized for its use.

What could of coursed such an overload do you think, i could only put it down to bad connection in switch or shower not been correctly turned off after use? Ideas?

Cheers

 

[spark 68]

In my experience the burning is usually confined locally to the weakest link, be it the cable itself, or a high resistance joint, I would expect it to be either at the fuse to board interface itself, or possibly to the terminations to the fuse carrier terminal.

See what others think.

 

[telectrix]

as above. bad connection at the fuse.

 

[Snapester]

Yeah well I usually would say most resistive joint but it was locked tight into the carrier! Strange but I guess it would have to be as the overheating was only there!

 

[1shortcircuit]

Perhaps there was a nail in place of the fuse?

 

[oldtimer]

Yep weakest part of a heavy load circuit I have lost count of the burnt out shower switches I have had to replace plus a CU as above all due to slack connections

 

[Lucas]

And that is why I hate rewireables. Should be outlawed across the country. Horrible things and lethal. If I was a millionare i would get a campaign agaist them going, only place they should be is in the bin!!

 

[trev]

So if you were doing an EICR in a property with one Lucas, how would you code it?

 

[oldtimer]

Just to add if you look at the picture that was the second time it happened plus me thinks the owner did a quick repair but with a blunt screwdriver mind should not complain its good business for me