What could cause this?

[Dixon]

Hi

This is a junction / isolate / led / fused box that supplies a digital shower mixer. it does not heat water, it just regulates the flow.
The shower stopped working and the led was off on the switch.
So i opened it to investigate.
I was surprised to so so many wires.

What would cause this burning to the wires? see photo

Thank you for any advice.

 

[Cadgey123]

Looks like a slack neutral connection.

Could be a multitude of things. Better get a sparky to once it over.
How big is the shower flow power supply? ( in kWs)

 

[Squid]

As above, loose neutral arcing, the sheathing on one of the neutrals has been burnt back/melted quiet far.

 

[Octopus]

I wonder what else isn't working?

 

[Pete999]

Hi

This is a junction / isolate / led / fused box that supplies a digital shower mixer. it does not heat water, it just regulates the flow.
The shower stopped working and the led was off on the switch.
So i opened it to investigate.
I was surprised to so so many wires.

What would cause this burning to the wires? see photo

Thank you for any advice.

Loose connections would cause burning

 

[telectrix]

Loose connections would cause burning

as did joan of arc.

wonder if that's where the term arcing came from.

 

[Pete999]

as did joan of arc.

wonder if that's where the term arcing came from.

Got it from a reliable source Tel, Arcing is derived from the exclamation, "Arc it that something on fire, or Ark at that crackling noise coming from that switch" nothing to do with the Maid of Orleans.

 

[plugsandsparks]

Suspect the ring ? could be poorly, also could have been caused by ring current rather than shower mixer.

 

[PEG]

What circuit is that riding on?

 

[NDG Elecs]

And why oh why when there is a loose connection on a shower is it always the N!! Granted, the OP is probably not drawing much.

I would happily wager £500 that on the next 'my shower isn't working' call that it will be the neutral.

I did read a possible explanation once on IET website, think resonance was something to do with it, but cannot recall correctly. But it wasn't necessarily to do with N's not being tightened enough...

Sorry, gone off on a little tangent there!

I am wandering what the blackish marks are on the metal link between the two mounting screws??

 

[Risteard]

And why oh why when there is a loose connection on a shower is it always the N!! Granted, the OP is probably not drawing much.

I would happily wager £500 that on the next 'my shower isn't working' call that it will be the neutral.

I did read a possible explanation once on IET website, think resonance was something to do with it, but cannot recall correctly. But it wasn't necessarily to do with N's not being tightened enough...

Sorry, gone off on a little tangent there!

I am wandering what the blackish marks are on the metal link between the two mounting screws??

I know where you're coming from but the last one I had (two days ago) was on the phase conductor.

 

[telectrix]

I am wandering what the blackish marks are on the metal link between the two mounting screws??

corrosion caused by condensation.

 

[NDG Elecs]

I know where you're coming from but the last one I had (two days ago) was on the phase conductor.

Liar Liar pants on !! Don't believe a word of it Risteard!! that's my 500 nicker gone!!

 

[SparkyChick]

I am wandering what the blackish marks are on the metal link between the two mounting screws??

corrosion caused by condensation.

I'd say PVC fire/vapour residue.

 

[Pete999]

A bad connection would be my option, all this Scientific Carp, next we will be saying it's Phaser burn, or a blast from a Klingon Disrupter, or is that a Romulan weapon?

 

[Squid]

A bad connection would be my option, all this Scientific Carp, next we will be saying it's Phaser burn, or a blast from a Klingon Disrupter, or is that a Romulan weapon?

Nah, its the whatcamacallit thingymagic that makes it all go around that has failed.

 

[Dave OCD]

It's always amusing to see the screw caps still parked in the back of accessories which have been ignored

 

[NDG Elecs]

It's always amusing to see the screw caps still parked in the back of accessories which have been ignored

They weren't fitted because of the colour of them! It's disgraceful, they should be white too match the fronts....!

 

[NDG Elecs]

Nah, its the whatcamacallit thingymagic that makes it all go around that has failed.

I do love some technical terminology!

 

[ruston]

I do love some technical terminology!

A few expletives in there and it would almost pass as a Geordie assessment of the situation.