Hot tub supply

[Paul K]

That's an old wood frame Wylex, I think. Can't be many of those still in service - I haven't seen one for years.
I think the one thing we can say for sure on this thread is that the fusegear needs upgrading as a matter of urgency.

It’s being done soon, proper mess isn’t it.

 

[brianmoooore]

Here am I, commenting on ancient wooden Wylex boxes, when I've actually fitted loads of them. Not the brown wooden ones though, only the white.

 

[Paul K]

Depending on the requirements of the actual hot tub, the cable size should be adaquate, but it is likely sitting in the attic as a flat grey twin and earth cable.
If you were to extend this to outside, you would need to use something appropriate for outside, as twin and earth can not be used externally.

We still need the electrical requirements of the hot tub to advise fully.

Can Twin and earth be used outside if it’s in conduit?

 

[brianmoooore]

It's exposure to UV light from the sun that's the problem, so putting it in conduit solves that problem, BUT, if the conduit is exposed to the sun, it will raise the temperature of the cable inside, and reduce its current carrying capacity. This might require an increase in cable size.
Not been mentioned yet, but what are the earthing arrangements of the property?

 

[Paul K]

It's exposure to UV light from the sun that's the problem, so putting it in conduit solves that problem, BUT, if the conduit is exposed to the sun, it will raise the temperature of the cable inside, and reduce its current carrying capacity. This might require an increase in cable size.
Not been mentioned yet, but what are the earthing arrangements of the property?

I don’t have a clue, I just posted a picture of the whole board if that shows anything?

 

[PS Electrics]

It's exposure to UV light from the sun that's the problem, so putting it in conduit solves that problem, BUT, if the conduit is exposed to the sun, it will raise the temperature of the cable inside, and reduce its current carrying capacity. This might require an increase in cable size.
Not been mentioned yet, but what are the earthing arrangements of the property?

Looks TNC-S from the picture. Also supply is looped?

OP Any reason for the CT Clamp on the tails? Is it because it is a looped supply?

If you are thinking of adding anything later you might want to look into getting un looped whilst you are doing this work.

You have a 60A supply so you will probably be ok if the hot tub definitely isn't an addition to the shower (with what loads are showing in the picture). Otherwise you may need an upgrade and to do that most certainly you will need unlooping.

The CT clamp makes me think there is some sort of throttling going on but then again it doesn't look like you have much connected? 4 circuits and the Shower? Storage Heaters are out but even if they were in you would discount them for Maximum Demand as they would be on over night.

The rating of your proposed hot tub will have a bearing on all the above.

 

[Paul K]

Looks TNC-S from the picture. Also supply is looped?

OP Any reason for the CT Clamp on the tails? Is it because it is a looped supply?

If you are thinking of adding anything later you might want to look into getting un looped whilst you are doing this work.

You have a 60A supply so you will probably be ok if the hot tub definitely isn't an addition to the shower (with what loads are showing in the picture). Otherwise you may need an upgrade and to do that most certainly you will need unlooping.

The CT clamp makes me think there is some sort of throttling going on but then again it doesn't look like you have much connected? 4 circuits and the Shower? Storage Heaters are out but even if they were in you would discount them for Maximum Demand as they would be on over night.

The rating of your proposed hot tub will have a bearing on all the above.

Hi, yes it’s looped and that’s being sorted as we speak. (As in national grid are aware of it and have said they’re unlooping it) I’m having an EV charger installed so that’s the reasoning behind that.

Well originally it was 8 with the storage heaters.

That clamp attached to some old British Gas ariel not sure what it’s for.

As for the hot tub supply, that’ll just be the hot tub and not shower as the shower now runs directly from the boiler.

 

[Jock from the north]

Thanks for all the helpful advice, I’m going to get a new consumer unit installed for some old fuses anyway so I’ll just change integrate that one into the new board. What I wanted to do was avoid having a new cable run from the front of the house to the back. Hopefully I can make use of the shower cabling to solve that problem.

That RCD switch controls nothing at the minute, when I first moved into the house here was no gas so that RCD was for the storage heaters which has a separate consumer unit to the right. I capped them all off when I removed them as soon as I had my gas piped in.

Really appreciate everyone’s input.

If your getting a new consumer unit pay a little extra and get one with rcbos it will cost a little more but we'll worth the inconvenience if you ever have a faulty appliance or indeed a fault with an existing circuits.if you go for a split board your on a hiding to nothing .1 fault and you lose half your lights and sockets .I wish new build
companies would stop installing them.Your sparky will keep you right with type of surge protection.

 

[Jock from the north]

Looks TNC-S from the picture. Also supply is looped?

OP Any reason for the CT Clamp on the tails? Is it because it is a looped supply?

If you are thinking of adding anything later you might want to look into getting un looped whilst you are doing this work.

You have a 60A supply so you will probably be ok if the hot tub definitely isn't an addition to the shower (with what loads are showing in the picture). Otherwise you may need an upgrade and to do that most certainly you will need unlooping.

The CT clamp makes me think there is some sort of throttling going on but then again it doesn't look like you have much connected? 4 circuits and the Shower? Storage Heaters are out but even if they were in you would discount them for Maximum Demand as they would be on over night.

The rating of your proposed hot tub will have a bearing on all the above.

I to have a looped supply because they were to lazy to dig an extra track in 1981.i get paid 11 pound or so a year and it was back dated 16 years .was through a company who sent a letter out the blue and they took commission to .wish I never replied to them cos dno will prob say 'well you signed something saying it was OK so we are not removing it" it's a total mess as well they way its run in ,big loops and kinks ,through creep holes un cleated.if a rat chewed it and it burnt down my house or I accidentally damaged it ,who takes responsibility?

 

[mainline]

Hi everyone,

I have a redundant 40amp fuse on its own breaker which was originally for a shower. It’s capped off in the loft, can I use this supply to power a hot tub?

Cheers in advance.

Where is the hot tub going to be located ?
Does the manufacture say anything with regard to earthing.

 

[Jock from the north]

Looks TNC-S from the picture. Also supply is looped?

OP Any reason for the CT Clamp on the tails? Is it because it is a looped supply?

If you are thinking of adding anything later you might want to look into getting un looped whilst you are doing this work.

You have a 60A supply so you will probably be ok if the hot tub definitely isn't an addition to the shower (with what loads are showing in the picture). Otherwise you may need an upgrade and to do that most certainly you will need unlooping.

The CT clamp makes me think there is some sort of throttling going on but then again it doesn't look like you have much connected? 4 circuits and the Shower? Storage Heaters are out but even if they were in you would discount them for Maximum Demand as they would be on over night.

The rating of your proposed hot tub will have a bearing on all the above.

Where is the hot tub going to be located ?
Does the manufacture say anything with regard to earthing.

I know some insist on tt others just make a statement on instruction manual all works to be carried out in accordance with the latest bs7671 wiring regs etc.

 

[Paul K]

Where is the hot tub going to be located ?
Does the manufacture say anything with regard to earthing.

It’s going on my patio at the back of the house, I’m in the process of having the garage shortened to come into line with the back of the house. The car doesn’t fit in it so it’s just storage really. I haven’t got the hot tub yet, we’re looking at some the weekend.

 

[mainline]

I know some insist on tt others just make a statement on instruction manual all works to be carried out in accordance with the latest bs7671 wiring regs etc.

The stipulation by some manufacturers in having to have a TT supply can make it very difficult to comply.
Where there is metal work connected to the pme in proximity, for instance.

 

[Jock from the north]

The stipulation by some manufacturers in having to have a TT supply can make it very difficult to comply.
Where there is metal work connected to the pme in proximity, for instance.

I agree.plus if the tub is close to proximity of house driving down a rod could lead to problems to say the least

 

[littlespark]

Ask the question again AFTER you’ve decided on which hot tub you are buying.

Some come with a 13A plug… a lot don’t.


If you are getting an electrician in to do the work, they may insist on running a new cable right back to board anyway.
One less joint is one less point of failure….