I've just bought a 10.9kw Mira shower, whats the thickness cable i need?

Is it ok to put a short piece of wire on it with a plug and plug it into the extension lead?

 

Not really I do know better than that!

Just wanna double check its the same cable as Electric cooker applications?

Along with the double pole switch and RCD in the fuse box

Cheers lol

 

4mm twin and earth, on its own circuit breaker in the consumer unit - need to have a 16ms trip time so the breaker is a catagory B one i think - was years ago when i did all this at college

 

Yeah i knew about the breaker, so 4mm then. Cheers.

 

It needs to be AT LEAST 10mm twin and earth, depends how long the cable is going to be. (earth loop impedance) or you better get an insurance claim form ready.

Disclaimer:

Since 1st January 2005 electrical installations in domestic properties come under building regs part P.
This restricts installation of new wiring to approved contractors, or subject to building regs approval amd inspection, for a fee of course.

 

10mm twin and earth - thats way to heavy - we never used to even fit anything above 4mm armoured for 12kw machinery when i was a maintenance bod

 

i havent got my cablee tables at home with me (anyone got the 16th edition iee?) but im sure you on the edge of 10mm, but it should be fine

of cause it all depends on the cable run

 

whats that 3phase machinery though?

 

That'll be 12kw 3 Phase....think about it..

 

thats a good point - 3 different phases to distrbute the current - my excuse is i aint put any of the theory into practice in about 4 years

 

voltage drop, ambient temperature, resistence of the cable and heat generation are more of a factor in single phase from what i remember - its ages since i studdied it, might have to dig my 16th edition regs book out

 

ya its an exciting coarse isnt it

 

never did the 16th edition course - i walked out of my job, they were going to put me thru it tho - kinda wish i stayed now and got 16th edition qualified - altho i left with onc and hnc in electrical engineering - but i've forgotten nearly all of it

 

http://www.tlc-direct.co.uk/Book/4.3.9.htm

data and cable tables

 

I'm aware of the new regs, all i wanna do is the cable run to save on labour cost. I'll get a sparkie to connect it either end.

I'll ask a sparkie at work tomorrow.

 

10 mm twin and earth m8.

 

focusv8,

the mad thing is,, my boss is charman of the south wales IEE, he bought a house for his girl, the morgage company wanted a certificate to say the electrics of the house was up too spec,,,,, he wasnt alowed to write one as he wasnt approved

 

thats a bit shit really

 

I'm 99.9% sure its a 45amp rated cable tho

 

what do you think the current is of a 10.9kw heater?

 

Nearly 44 amps.

 

45.41 amps

i'd install 60 amp cable minimum to take into account the ambient temperature, voltage drop and starting current for the heater in the shower

 

i always work it out on 230 volts to be on the safer side

 

47 amps at 230v. You need 10mm twin and earth minimum. You'll never run it at full chat tho. Make sure its wired through a shower isolator/pull cord.

Part P is a pain in the fookin ass. More money scamming.

 

Oh gawd what have i started..................

 

10 mm twin & earth.
The End.

 

always a good idea...

 

WOW all this to wire up a shower.

 

And I bet it was a women who asked him to do it, thinking its a five minute job

Sometimes you have no idea