Question about hot tubs

[Craig2022]

Hey, I’ve been asked to put power for a hot tub.

I was sent a manual from the customer which is called “AllegroMagicOwnersManual” after looking into this they say it needs a minimum of 48AMP for their products. Meaning this will need a brand new supply pulled in.

My only issue is I haven’t worked with hot tubs before and I’ve spoke to couple people that are saying this sounds way to much Amp for a hot tub?

Has anyone any advice on hot tubs or worked with the model in question?

Thanks

 

[bigspark17]

Maybe you could post a link to the manual, it does sound very high 48A, it could be the inrush/starting current.
Some MI state Must be TT others dont specify.

 

[buzzlightyear]

maybe you should hand it over to some one that know what they are doing .it may be out of your comfort zone .considering you are a trainee,

 

[Marvo]

Yes, they have a 5.5kw heater plus pump etc. Install it on it's own 50 or 60 Amp circuit same way you would with a shower.

 

[Nigel]

Some tubs have an either or function with their heater and pump. Some have the ability to have both on. Sounds like you have the later.

 

[Nigel]

Maybe you could post a link to the manual, it does sound very high 48A, it could be the inrush/starting current.
Some MI state Must be TT others dont specify.

MI would be stupid then.

 

[bigspark17]

MI would be stupid then.

Why?

 

[Craig2022]

http://swimolympic.com/images/spas/07AllegroMagicOwnersManual.pdf

Yeah I don’t believe I’m going to go forward with the job, with it needing a new supply. But there’s no harm me looking for the information to make sure I was on the right track.

Thanks for all the replies so far

 

[Wilko]

Hi - manufacturer's instructions seem to be 240V, 48A and RCD. If the house was PME and the tub is on the ground remote from the house, I'd be inclined to TT the new installation. But that's just me .

 

[Nigel]

Why?

Because blanket statements like that can sometimes be incorrect.

 

[Nigel]

Hi - manufacturer's instructions seem to be 240V, 48A and RCD. If the house was PME and the tub is on the ground remote from the house, I'd be inclined to TT the new installation. But that's just me .

Even if it was on wooden decking with nothing else around?

 

[Strima]

Even if it was on wooden decking with nothing else around?

Wet decking can be conductive... I would cover the whole garden in copper sheet bringing the area to the same potential.... {joking}...

 

[telectrix]

Wet decking can be conductive... I would cover the whole garden in copper sheet bringing the area to the same potential.... {joking}...

better get your ladders up to the church roof then

 

[Nigel]

Why anyone would TT a hot tub with no extraneous metallic parts available to touch is beyond me.

 

[Devonchris]

Why anyone would TT a hot tub with no extraneous metallic parts available to touch is beyond me.

Maybe because IET guidance says that when outdoors you should?

(Extract from wiring matters)
All electrical work should comply with BS 7671. There are no specific requirements for electrical installations associated with hot tubs in BS 7671. However, where a hot tub is located outdoors in the open air, for example a garden, IET Guidance Note 7 Special Locations recommends that the requirements of Section 702 (swimming pools and other basins) should be applied. The requirements for swimming pools are given in Section 702 of BS 7671:2008+A3:2015. IET Guidance Note 7 also sets out the risks.

But it's only guidance and down to risk assessment at design stage by whoever is designing and installing I suppose.

My understand, for what its worth as it was imparted a long time ago, is that any metallic parts of the installation would be earthed. The extraneous conductor in this case would be the ground especially when wet and with bare feet.