Electrical shower

[Cj24]

Hi Iv been to someone's house who said there shower pull cord sw was smelling of fish so I opened up the pull cord to find the Neutral on the supply side was melting and the copper was all black and the switch was melting as you could see the plastic slightly disformed so the smell was surely the burning of the plastic, I remade connection off and reused the same switch as a temp measure, the guy ordered new sw and was getting back to me but not heard anything then 3 weeks later I get a call saying smells back so Iv been round and changed for new switch but the supply Neutral had started to melt again, any ideas? And do you think it will happen again? It is 8.5kw shower and 10mm cable and it's a short distance from the board do you just think it was a loose connection? As I can't see what else it could be

 

[Andy78]

i agree skelton but look at this.

when do you think this problem occurred?

not long after a ecir lol

it wasnt bad quality breakers, it is a bad company full of limp wristed spastics

I particularly like the visible sticker behind the charred breaker

 

[Geordie Spark]

i agree skelton but look at this.

when do you think this problem occurred?

not long after a ecir lol

it wasnt bad quality breakers, it is a bad company full of limp wristed spastics

Y' see .. THAT'S wot 'appens when ye divven't use yer TORQUE SCREWDRIVER ... innit??!!! :6:

Aye .. right ... bolleau 'n' shyte. :laugh:

 

[D Skelton]

look at what buddy?

Where's the shower isolator?!



Yeah, I get your point, it still doesn't explain the high number of shower isolator problems in comparison to other isolators though does it?

I've not yet had to replace a burned out cooker switch.

Funnily enough though, looking at that pic, I've replaced a few melted Square D boards due to a loose neutral connection on the main bar. Only Square D though???

 

[shanky887614]

Where's the shower isolator?!



Yeah, I get your point, it still doesn't explain the high number of shower isolator problems in comparison to other isolators though does it?

I've not yet had to replace a burned out cooker switch.

Funnily enough though, looking at that pic, I've replaced a few melted Square D boards due to a loose neutral connection on the main bar. Only Square D though???

people dont seem to check manufacturer terminals in my experience.

there is a lot more space in a cooker switch for a start so there is less stress on the cables,

how often is it a struggle to push an isolator back?

 

[Geordie Spark]

Where's the shower isolator?!



Yeah, I get your point, it still doesn't explain the high number of shower isolator problems in comparison to other isolators though does it?

I've not yet had to replace a burned out cooker switch.

Funnily enough though, looking at that pic, I've replaced a few melted Square D boards due to a loose neutral connection on the main bar. Only Square D though???

I blame insufficient length of thread in the bus bar. If the screw is (say) an 5mm then the thread in the bus bar should be at least that length but you'll be lucky to find 3mm.

Then there's the issue of what we engineers call "p!$$y slack" threads where the thread profile is so poorly formed the screw rattles about in the hole.

Put the lack of thread length and the poor fit together and you haven't a hope in hell of the screw ever staying tight - even with a magical torque screwdriver!!

Have a look at the really old stuff where they used cheese head cut thread (not rolled like todays) screws and the thickness of the busbars and the amount of extra thread that allows & you'll get what I'm on about.

 

[1stfix2ndfix]

They're not all red!

A rotary isolator would look awful in a drama studio!
And using a contactor where a simple switch will suffice is like using a sledge hammer to crack a nut!

A contactor which remains energised for weeks or possibly months on end is more likely to fail than a 45A DP switch.

The installation is pretty simple, it's a stage LX dimmer. A box which contains multiple dimmers controlled by a remote signal. They can be anything from 4x2.4KW dimmers up to 72x5KW dimmers.
In this instance I had a 6x2.4KW in mind as that is the normal basic size.

Made me laugh that did

 

[D Skelton]

I blame insufficient length of thread in the bus bar. If the screw is (say) an 5mm then the thread in the bus bar should be at least that length but you'll be lucky to find 3mm.

Then there's the issue of what we engineers call "p!$$y slack" threads where the thread profile is so poorly formed the screw rattles about in the hole.

Put the lack of thread length and the poor fit together and you haven't a hope in hell of the screw ever staying tight - even with a magical torque screwdriver!!

Have a look at the really old stuff where they used cheese head cut thread (not rolled like todays) screws and the thickness of the busbars and the amount of extra thread that allows & you'll get what I'm on about.

And there in lies the esscence of what I'm talking about!

A smorgasbord of pi$$ poor products on the market!

Sometimes, I just want to give up and get into plumbing!

They earn more, they put up with less crap, and they don't have to think about what they're doing!

 

[shanky887614]

And there in lies the esscence of what I'm talking about!

A smorgasbord of pi$$ poor products on the market!

Sometimes, I just want to give up and get into plumbing!

They earn more, they put up with less crap, and they don't have to think about what they're doing!

dont go into industrial though, was pmsl at the pipe fitting crew that wired boilers etc up wrong after 30 years experience lol and leaks everywhere

 

[DPG]

And there in lies the esscence of what I'm talking about!

A smorgasbord of pi$$ poor products on the market!

Sometimes, I just want to give up and get into plumbing!

They earn more, they put up with less crap, and they don't have to think about what they're doing!

Surely plumbers deal with more crap? Daz

 

[Geordie Spark]

And there in lies the esscence of what I'm talking about!

A smorgasbord of pi$$ poor products on the market!

Sometimes, I just want to give up and get into plumbing!

They earn more, they put up with less crap, and they don't have to think about what they're doing!

I was agreeing with you right up to the last 9 words!! :angry_smile:

 

[telectrix]

ah/ a plumber that can count up to 9. good job you've still got all your fingers then. :smilielol5::smilielol5::smilielol5:

 

[shanky887614]

I was agreeing with you right up to the last 9 words!! :angry_smile:

steel is a lot harder because you need to get bends etc spot on all the time or it wont work

 

[shanky887614]

ah/ a plumber that can count up to 9. good job you've still got all your fingers then. :smilielol5::smilielol5::smilielol5:

shhh i bet he had to use his toes

 

[Geordie Spark]

ah/ a plumber that can count up to 9. good job you've still got all your fingers then. :smilielol5::smilielol5::smilielol5:

---- off an' stick a red hot needle in yer Jap's eye ye Scouse git! :89:

 

[telectrix]

thought that'd wake you up.