help

[demkap]

hi there just wondering any calculations for working out cable size. so example i have a 9.6kw shower what breaker and cable size do i have to use?
also with wired in smoke detectors can they be wired say off a socket circuit or a fused spur in use or does it have to have its own circuit?

thanks

 

[demkap]

hi there just wondering any calculations for working out cable size. so example i have a 9.6kw shower what breaker and cable size do i have to use?
also with wired in smoke detectors can they be wired say off a socket circuit or a fused spur in use or does it have to have its own circuit?

also how much for a pir test on average?
and a consumer unit change?
thanks

 

[Octopus]

Are you sure you should be doing this work, if you have to ask such questions?

 

[demkap]

yea i am competent i just some advice because i havent done this type of work before strangely?

 

[Octopus]

Have you asked your scheme technical support?

 

[ebow72]

OSG is the way forward..for the cable calcs

 

[mhar]

Appendix 6 osg would be a good starting reference

 

[Amp David]

Easiest way would be to ring a few local electricians and get some quotes.

 

[Amp David]

yea i am competent i just some advice because i havent done this type of work before strangely?

If you never done it before, how can you be competent to do it then:6:

Amazing

 

[telectrix]

just to add a positive note. first select your cable according to the load, work out the current first. allow for derating due to whatever the installation method, then calculate the volt drop for that particular current load and length of run ( all in OSG.). if VD is within limits, then you're good to go. hint, if you don't get somewhere between 6mm and 10mm, you've done it wrong.

then , of course there's RCD protection , earthing and bonding issues to be addressed. not to mention notifying the gestapo.

 

[mhar]

Plus total load calcs. Have a customer just bought a house for mum opposite them. Wanted an 8.5kW shower installed, they have a looped 7.5kW supply!

 

[ackbarthestar]

First calculation you will need to do will be how much will a course coast to train as an electrical Journeyman
You will need to speak to your local college regarding places for next year.
Ask about C&G 2357 and NVQ.
Then after a couple of years you can then move onto C&G 2382-12

 

[ebow72]

hi there just wondering any calculations for working out cable size. so example i have a 9.6kw shower what breaker and cable size do i have to use?
also with wired in smoke detectors can they be wired say off a socket circuit or a fused spur in use or does it have to have its own circuit?

also how much for a pir test on average?
and a consumer unit change?
thanks

Have you not already posted this in the general forum?
Seriously mate, if you are a student or learner, you would have an idea in which books to have a gander in...
The post is a tad bit ambiguous too, from a cable size to PIR and then to top it off a CU change....
If you are having issues at least try and deal with one at a time, maybe, just maybe the response might be a bit more encouraging..
Demkap, over to you....

 

[Guitarist]

And most importantly, follow manufacturers instructions. They often tell you what size you should use. It is a reg requirement to follow this.

As others have said tho, if you have never installed a shower or worked out cable/mcb sizing, or even know about how to wire up smoke detectors, then I would question the use of the word "competent" regarding this type of work.

 

[Des 56]

hi there just wondering any calculations for working out cable size. so example i have a 9.6kw shower what breaker and cable size do i have to use?
also with wired in smoke detectors can they be wired say off a socket circuit or a fused spur in use or does it have to have its own circuit?

also how much for a pir test on average?
and a consumer unit change?
thanks

I dont understand why you are interested in the price of a pir

Understanding cable sizes and mcbs ratings etc, are not the type of questions that the inspector would require to ask
Why do you want opinion on this?