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??

 

[ian w j]

Yeah get that, just no need for a 6mm 32amp radial running a 13amp single socket.

 

[trev]

1 x 6a smoke

I'm putting in some Aico smokes tomorrow, Ei 141. 40 milliamps each. so there's a saving for you straight away.

 

[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:

So what your saying is your cooker isn't on its own circuit but on a radial socket circuit ?

 

[ian w j]

Confusing myself now! It's on its own circuit, it is a radial, to a cooker control unit which incorporates a single socket. The feed from the cooker control goes behind the cooker into a 13amp socket outlet not a cooker connec tion point. (the cooker is on a plug top, as per when it was built in 2002. Hope this is a bit clearer!

 

[ian w j]

Thanks for that, it may help! Plus all the energy efficient lighting in the house, considering they were designed with 100watt per lamp holder.

 

[DPG]

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:

Dropping MCB size will not reduce the current drawn! Daz

 

[ian w j]

No but if you remove the fit a cooker control unit with out a socket you are limiting it to 13amp!

 

[ian w j]

Think we are going off the subject in hand now though! Can anyone give me a true estimate from experience what the current load is likely to be using diversity for the installation? I've seen a post saying a good rule is take the largest breaker and add 40% for the total if the remaining! This gives me about 90 amps

 

[Andy78]

Have you found out what size DNO fuse you have yet ?

 

[trev]

Ian, apart from anything else it's your house! You know the usage patterns on this one mate. That's more use than anything you'll get out the OSG.

 

[dazza1981]

Dear god help me !!!!
This is year 1 college stuff and amature at best. Seriously mate i dont want to have a dig here but you should be able to figure this stuff out naturally if your a sparks ????
Let your "mate" who is going to sign it off do the whole install if he is any good and get it done properly!!!!

 

[ian w j]

It's a 100 amp, type 2 b 1361 without cutting off the seals, that's what it says on the tin!irate:

 

[trev]

What it says on the tin isn't necessarily what's inside it mate.

 

[Guest77]

It's a 100 amp, type 2 b 1361 without cutting off the seals, that's what it says on the tin!irate:

now look fella pull yourself together, if you look at what you have posted again you will see you have the same as everybody else in your street except some of them have 10kw showers as well, come on man get a grip.

 

[Andy78]

It's a 100 amp, type 2 b 1361 without cutting off the seals, that's what it says on the tin!irate:

So it could be a 60A then ......

I think Dazza has given the best advice of asking your mate for advice. You just seem to be confusing the forum and yourself at the moment .....