13amp Hot tub supply

[HRM-ELEC]

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

 

[Welchyboy1]

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]

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]

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.

 

[HRM-ELEC]

Would you drop the pme earth at socket/isolator and TT the rest or am I over thinking it ?

 

[Midwest]

Would you drop the pme earth at socket/isolator and TT the rest or am I over thinking it ?

I’ve read here before now, that some would do both.

What surface is the hot tub being installed on?

 

[Charlie_]

Going off the top of my head too so not %100 sure..
The length of run is 80m though

 

[HRM-ELEC]

It will be Sat on decking with around 2/3ft surrounding before it turns to grass again

 

[Midwest]

The length of run is 80m though

That’s the length of cable OP has in his garage.

 

[Charlie_]

That’s the length of cable OP has in his garage.

.
Ahhh hahaha okey dokes

 

[Charlie_]

That a long garage

 

[Midwest]

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]

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.

 

[HRM-ELEC]

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

 

[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.

 

[Charlie_]

Hot tubs
Local isolation
Very drunk people
What could possibly go wrong