hot tub supply in domestic dwelling 32A, 100A supply

[ian w j]

Help Needed !!
The wife has just purchased a hot tub off eBay! I am a spark but not a bright one!! I was just looking into what's required for the supply and they are stating 8-10kw load 32-40amp supply. To an an isolator and have Rcd protection.. yeah ok so far. I know about the zones regarding position of isolator and other equipment as per the regs, but I am stressing about the demand and diversity of the installation. I'm going to do the work and get a friend to pass it off and certify.

Currently I have a 100amp single phase domestic supply.

The dis board has:
2 x 32a rings
1 x 32a radial cooker supply with single socket(cooker is 13a socket)
3 x 6a radial light
1 x 6a smoke
1 x 6a water(no immersion heater)

I've done a diversity calc not taking into account the smoke and the heating time clock and come up with 103amps using a 32 amp supply to the hot tub.
My supply is 100amps !! Is this right??

 

[Bobster]

Your an electrician, that is going to get someone else to pass it off and certify?

Pull the other one, it's got bells on it!

 

[ian w j]

Thanks for your constructive advice! And it will, as all the work is being done under a building notice with the local Building Control!
Constructive answers please!

 

[Darkwood]

Firstly 100amp is the DNO carrier rating, it may have a lower rated fuse in it.

If your holding the title of Electrician then basic domestic diversity should be well within your knowledge and if you need a reminder check your OSG for a reminder.... If you claim to be an Electrician then state your not too bright then its just a matter of time you put yourself or someones life at risk or property for that matter.... I seriously hope it was a jovial comment and not an admit!

PS Welcome to the forum ... emoticons help a lot when expressing sarcasm, comedy anger etc and saves us misinterpreting your post

 

[Bobster]

No problem.

Ok then. If you show me how you got to that staggeringly wrong diversity calculation. I'll tell you where you've gone wrong and how to get it right.

How's that?

 

[ian w j]

Cooker 10 A plus 30% plus 5amp for socket
32amp full load of hot tub.
Help is much appreciated

 

[ian w j]

SORRY HALFTHE POST MISSING!
What is was supposed to say was :
1st 32amp 100%
2nd 32amp 40%
light 6amp 66 %
light 6 amp 66%
light 6 amp 66%
cooker 10a plus 30% plus 5amp
32amp full load of hot tub

 

[irn-brue]

Move this question to the diy thread.Thats a constructive answer.

 

[ian w j]

Just to confirm I am an Electrician but the knowledge learnt about domestic is all in the back of the grey matter! I have worked for the last 10 years on pumping stations and control panels so dont really get to use diversity and demand of circuits as they are designed and never really changed! They normally have 3 phase star delta controls with a small dis board which supplies 1 light, 1 rcd socket and a small tube heater.
If you are ever stuck with these I may be able to help!!!:stooge_curly:

 

[ian w j]

thanks irn-brue:willy_nilly:

 

[martinh89]

whats your cooker rated at ?

You can diversify diversity, you just need to look at a few things closely, like lighting, is it incandescent or fluorescent ect ....

 

[ian w j]

Its run off a 6mm radial B32 , to a socket outlet 13A/cooker switch to a socket outlet behind the cooker. Could I change this for a B16, as the wall the socket is on is going to be knocked down, so only need a supply for the cooker. Sorry to confuse the matter!irate:

 

[martinh89]

And there is always the fact that whilst your using the hot tub , it is highly unlikely that your cooker and hob will be on whilst all your lights are switched on and all plug sockets in the house will be under load .......

 

[martinh89]

Its run off a 6mm radial B32 , to a socket outlet 13A/cooker switch to a socket outlet behind the cooker. Could I change this for a B16, as the wall the socket is on is going to be knocked down, so only need a supply for the cooker. Sorry to confuse the matter!irate:

That's a different story all together mate, if you want to supply your cooker on an independent circuit of its own youll need you current design current and then choose a protective device with a suitable rated current ect ect ect ....

 

[Guest77]

:smilielol5:103 amps? lol