is it okay to extend shower cable or should i do new run.

[paulthemagpie]

Hi guys,

im installing a electric shower and at same time removing an immersion heater.

I was going to use the cable for the immersion heater as its big enough and on its on circuit.

Only thing is its about 2 meters short of were the shower is to be located. It would save an arful lot of messing if i could use this cable. so im asking is it okay to extend this cable (as per regs) with the likes on a junction box in the loft?

thanks

 

[telectrix]

what's the shower rating, and what cable is on the immersion?

 

[Octopus]

Why not replace the cable from the Immersion FCU?

 

[Jonny66]

Strange question, is it alright to extend a cable? It can be, depends on how you extend it and what with. See above, shower rating?, existing cable size? etc etc.....

 

[telectrix]

hope it's not 10.5kW shower going on 2.5mm. bonus of a heated towel drier.

 

[Jonny66]

Bet its a shower pump and 2.5mm immersion circuit.

 

[paulthemagpie]

yeah just opened it up and it only 2.5mm

with it being on it own circuit and being an immersion i was expecting it to be bigger for some reason

 

[telectrix]

2.5mm is the standard size cable for immersion heaters, ever since some numpty decided to do away with 7/029.

 

[paulthemagpie]

yeah its a 10.5kw shower.

Another quick question.

if they anything stopping me from having a bigger than needed cable incase i want a more powerful shower in the future?

 

[telectrix]

nope. bang in a 10.0mm.

but how anybody would even consider > 10.5kW is totally beyond comprehension.

 

[Jonny66]

No, as long as its big enough to take load, volt drop, Zs etc woops too late

 

[paulthemagpie]

so what if i banged in 10mm but i later got a 8.5kw.

 

[Jonny66]

I,m confused

 

[Knobhead]

Out of interest, who's signing this work off?

 

[SPARTYKUS]

so what if i banged in 10mm but i later got a 8.5kw.

? Not a problem. Same as if you wanted to just fit a single socket on the end of the 10mm2 radial at some point in the future. It's over engineered and will be a tight fit in the terminals .... bit suprised you ask that ... ?

 

[Knobhead]

I,m confused

Read some of his previous posts, you'll be even more confused.

 

[drew35]

I'm fifty percent confused and fifty percent scared for the person who ends up in the shower!

 

[SPARTYKUS]

My best mates 10.8kW shower ran off a 40Amcb in the airing cupboard, spurred off the immersion, spurred off a 16a radial socket circuit...for a bit. JB under landing went off like a grenade apparently

 

[ipf]

My best mates 10.8kW shower ran off a 40Amcb in the airing cupboard, spurred off the immersion, spurred off a 16a radial socket circuit...for a bit. JB under landing went off like a grenade apparently

Did he keep resetting the 16amp ?

 

[telectrix]

it was probably welded closed. like a 63A i had to replace some time ago. was constantly running at 100+A.