Shower cable breaker question

[Francozola]

And from the earth term in the shower unit along the hose to the shower head just to be sure

 

[i=p/u]

can walls be chased and cables clipped into chases, i thought that the chemicals in plaster is bad for the pvc????

 

[telectrix]

used to be on the old rubber cable and horsehair & lime plaster. modern cable/plaster no problem, but capping is advisable due to plasterers being let loose with sharp tools.

 

[i=p/u]

and would this require rcd even tho capped have you got a link

 

[telectrix]

yes it would require RCD if less than 50mm deep.

 

[i=p/u]

and link for capping or isit just a piece of plastic

 

[pushrod]

can be metal or plastic - just a bit of protection for when it is plastered. Also gives the theoretical chance that you could always pull a new length of cable in

 

[SPARTYKUS]

6mm2 will take alot more than 47A


If the run is in a liquid nitrogen cooled vat

 

[pushrod]

6mm2 will take alot more than 47A


If the run is in a liquid nitrogen cooled vat

lol

Aaah but then the insulation will become brittle and shatter causing a dead short and the mcb to trip

 

[Engineer54]

6mm2 will take alot more than 47A

And there lie's the problem with DIYers We have be trained from the very start of our training, that cables need de-rating according to the environments in which the cable is installed. Whereas in reality the cable can and will draw far more than than it's de-rated calculated value. In this situation as regarding a shower installation, the over current will only generally be drawn for short periods of time... So the cable is probably not being stressed to extremes and the 32A MCB isn't receiving sufficient time to trip the over current section within the MCB... So to the householder/DIY'er
everything is Sweet!!! AS has been stated, the problems come when the usage changes, like when children become teenagers, especially of the female variety (though there are quite a few male teenagers that are more like tarts in the bathroom...lol!!)

Is the installation alright then?? ...No of course it's not, We know the very real dangers of these situations, but you try telling DIY Joe that after years of reliable service that he got it all wrong!!! It's the same old story, and your looked at as though your just wanting to make an extra few quid at his expense and for no obvious benifit!!!!....

 

[BrightSpark75]

Thanks lads this discussion has helped me with a similar problem ;

neutral at the back of the double pole switch has melted insulation & the back of the switch. 10 mt run of 6mm to a 9kw shower on a 32a mcb. So gonna replace the cable with 10mm t+e, replace double pole switch & run from a single shower rcd.

So does it need tested too?

Thanks for the input ;-)

 

[youngsparky]

Always test new circuits and old circuits!

 

[BrightSpark75]

The whole board?

 

[SimpleSimon]

No the new installation from the shower RCD to the shower itself.
Continuity.
Insulation resistance tests.
Zs test.
RCD test.
And test Ze at origin so you know you gotta a good earth.
And it's notifiable.

 

[VoltzElectrical]

melted neutral? could that be loose connection rather than the cable being too small?