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Hi, I've been asked to install 13amp supply for a hot tub around 30m from the house.

Supply to property TN-C-S

Plan is to run a 4mm 2 core swa from a 16 amp mcb in the CU to a IP66 RCD switched fused spur (Aprox 25m from house)

Use the armour as the earth until it reaches the Rcd spur in which case I will heat shrink swa and then fit stuffing gland to terminate.

Earth rod with 10mm to the RCD spur and TT the rest.

Any advice would be great
 
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Charlie_

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Arms
What rating is the hot tub?
I usually do away with fcu option and just keep it all at 16amp..
obviously still have RCD protection
 

PEG

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What's this obsession with hot-tubs? ....are they for people who won't have a bath...unless they have a glass of plonk in their hand? ;)

Had three to look at,in last week...one out of action a while...looked like a jumbo bowl of pea soup :rolleyes:
 
N

Nigel

4mm - 13A???

Earth rod - why?

I would fit a socket if the customer is having a hot tub company deliver it as they will only want to see a socket.
 

Charlie_

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Arms
4mm - 13A???

Earth rod - why?

I would fit a socket if the customer is having a hot tub company deliver it as they will only want to see a socket.
I’ve had a few call outs where they have used a standard plug & socket, couldn’t remove the plug as it had melted onto the socket..

One of them shouldn’t have been on a 13a plug, as it was rated at about 3.2 kw.
The hire company had used a commando plug to 13a converter
 

Pete999

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Arms
Esteemed
Hi, I've been asked to install 13amp supply for a hot tub around 30m from the house.

Supply to property TN-C-S

Plan is to run a 4mm 2 core swa from a 16 amp mcb in the CU to a IP66 RCD switched fused spur (Aprox 25m from house)

Use the armour as the earth until it reaches the Rcd spur in which case I will heat shrink swa and then fit stuffing gland to terminate.

Earth rod with 10mm to the RCD spur and TT the rest.

Any advice would be great
Heat shrink the SWA? I take it you mean connect the armour to the Earth terminal in the FCU? Advice use a banjo on the SWA and use some suitably sized wire from there to the terminal, If I read your intentions correctly that is not the way to install this SWA, have you done any calculation for cable sizing. or is this a stab in the dark job. a stuffing gland is not the correct method, well you did ask.
 
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  • #10
The reason for heat shrink was to drop the pme earth at the FCU

As in the regs it recommends not to use PME earth.
 
  • Thread Starter Thread Starter
  • #12
For give me if I'm wrong on the earthing arangement.

I have around 80m of 4mm swa in my garage that needs using up should have stated that in original post.

I'm going to have to ring up the hot tub company as it only say on there website 13amp supply. Could really do with a power spec
 

Charlie_

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Arms
For that length of run you will need 6mm, based on a load towards the maximum 13 amp.
If you really want to use the 4mm then you will need to double up the cores
 

Welchyboy1

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Arms
Esteemed
For these plug in hot tubs, Is there a minimum distance the socket must be from the side of the hot tub, obviously zones apply, is it the same as a bath,
 

Welchyboy1

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Arms
Esteemed
For that length of run you will need 6mm, based on a load towards the maximum 13 amp.
If you really want to use the 4mm then you will need to double up the cores
You sure about that? 16amp supply 4mm is about 60meters off the top of my head

I may be wrong
 

Welchyboy1

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Arms
Esteemed
For that length of run you will need 6mm, based on a load towards the maximum 13 amp.
If you really want to use the 4mm then you will need to double up the cores
You sure about that? 16amp supply 4mm is about 60meters off the top of my head
 

telectrix

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you will probably find out from the tub supplier/manufacturer that it come with an integrated 10mA RCD in the mains lead. i get the VD on 4.0mm to be 4.3V so it's adequate for the job. ( 11 x 13 x 30 )/1000.
 
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  • #19
Would you drop the pme earth at socket/isolator and TT the rest or am I over thinking it ?
 
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  • #22
It will be Sat on decking with around 2/3ft surrounding before it turns to grass again
 

Midwest

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Arms
Esteemed
It will be Sat on decking with around 2/3ft surrounding before it turns to grass again
Never done one myself, but it’s a common question raised on here. As said, I read before that some advise with pms supply, to use supply earthing facility AND rod near tub.
Perhaps more learned members can comment on that?
 

robd

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Arms
Read a best practice guide on hot tubs which said TT it so I've done that on the few that I've done since.

IMG_20190430_154147816_HDR.jpg
 
  • Thread Starter Thread Starter
  • #28
Having come off the phone to a American bloke who could not not me the power raiding except it pulls 12.8 amps when pumps start.

My installation

16amp mcb from CU to a rcd ip enclosure with rcd fitting inside (drop pme at this point)

Pick up new TT earth

To 25amp rotary is lsolator to the hot tub
 
D

Deleted member 26818

Tescos and BM seem to selling a lot of LayZspa hot tubs at the moment.
The Hot tub itself is inflatable, like a large paddling pool.
The pump/heater/bubble maker is a separate unit with quite a long lead which has a 10mA in line RCD.

The pump unit is waterproof, though I have not found an IP rating. The unit has to be next to the tub to connect the pipework and so the controls can be reached.
 

remedial

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Trainee
is the TT earth just cos of the distance from the house? my mate got a jacuzzi hot tub installed a couple of years ago. they insisted on an electrician being on site when it was delivered. but i believe the standard install is just swa from the tub to an isolator switch nearby, and then fed back to the CU with RCD protection.
 
D

Deleted member 26818

Thing with these hot tubs, is you have to use chlorine, continuously heat and circulate the water and clean the filter daily.
 
N

Nigel

So if you need to TT will be based on whether if the PEN drops out is there a risk of a return path, from a fault through your body to true earth.

I have a hot tub and I have a PME but I have not TT'd it. The hot tub is all plastic and there is not extraneous conductive parts or exposed conductive parts anywhere near. The water heater is double insulated.

So if there is a fault there is no metallic parts for the live conductor to touch and bring the hot tub to live potential and the water heater is double insulated and it does not actually come into contact with water. It surrounds the plastic pipe that the water travels through.

So in my case installing an earth rod is a completely pointless exercise.
 
D

Deleted member 26818

The instructions for the LayZspa require the pump unit to be bonded.
Apparently there’s a connection point on the unit for this.
 
T

Toneyz

Hi, I've been asked to install 13amp supply for a hot tub around 30m from the house.

Supply to property TN-C-S

Plan is to run a 4mm 2 core swa from a 16 amp mcb in the CU to a IP66 RCD switched fused spur (Aprox 25m from house)

Use the armour as the earth until it reaches the Rcd spur in which case I will heat shrink swa and then fit stuffing gland to terminate.

Earth rod with 10mm to the RCD spur and TT the rest.

Any advice would be great
Thanks for the dumb all I asked was how you would get the 10mm into the spur/FCU an answer would have been sufficient if its advice you want from me then forget it.
 

Midwest

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Arms
Esteemed
I do feel these 'like, dislike, agree etc etc' icons create more negative responses, than they set out to achieve.

I mean, why is there a 'bad spelling' icon. Do I need some ---- on here to tell me, when someone has posted a reply with incorrect spelling & grammar??

I could of said, 'I mean, wheir is their a 'bid spelling' icen. Do I nead some twot on hear to till me, when someone has pisted incurrect spilling & grammer'. :D
 

telectrix

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Mentor
Arms
Esteemed
Tescos and BM seem to selling a lot of LayZspa hot tubs at the moment.
The Hot tub itself is inflatable, like a large paddling pool.
The pump/heater/bubble maker is a separate unit with quite a long lead which has a 10mA in line RCD.

The pump unit is waterproof, though I have not found an IP rating. The unit has to be next to the tub to connect the pipework and so the controls can be reached.
we have that one. it's exactly as you posted. the biggest drawback is the leccy bill.costs about £20/week.
 
T

Toneyz

I do feel these 'like, dislike, agree etc etc' icons create more negative responses, than they set out to achieve.

I mean, why is there a 'bad spelling' icon. Do I need some **** on here to tell me, when someone has posted a reply with incorrect spelling & grammar??

I could of said, 'I mean, wheir is their a 'bid spelling' icen. Do I nead some twot on hear to till me, when someone has pisted incurrect spilling & grammer'. :D
If you are referring to Pete999 I think calling him a twot is a bit strong.:p;)
 

Charlie_

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Arms
I like the look of the log burner type..
Especially for installations, only have to sort out lighting then :)
 

Spoon

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Mentor
Arms
Esteemed
I do feel these 'like, dislike, agree etc etc' icons create more negative responses, than they set out to achieve.

I mean, why is there a 'bad spelling' icon. Do I need some **** on here to tell me, when someone has posted a reply with incorrect spelling & grammar??

I could of said, 'I mean, wheir is their a 'bid spelling' icen. Do I nead some twot on hear to till me, when someone has pisted incurrect spilling & grammer'. :D
I have always said the same thing. They are a waste of time and just starts slagging off comments. I'd get rid of them if it was up to me, but the powers that be seem not to care but whinge when there is fighting in threads.
 
Last hot tub (last year) I fitted, I put a separate CU the house next to the main CU which had spare ways but they were on a split load board so I didn’t want any nuisance tripping in the house, I installed a supply to the tub with a rcbo on supply end used 6mm three core SWA at the hot tub end I installed an IP65 lock off isolator switch then the last five metres used 6mm three core flex (can’t remember the VV code for the flex)
 

UNG

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Mentor
Arms
Thing with these hot tubs, is you have to use chlorine, continuously heat and circulate the water and clean the filter daily.
You can use Bromine it is a lot more pleasant than chlorine and doesn't rot the tub and equipment.
Seen both chemicals used over the last 15 years and tubs used with chlorine generally have never ending repair bills from regularly replacing valves, seals, heaters and pumps etc.
Tubs used with bromine do seem to last longer before major repairs are needed
 
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