Hot tub help!

[Pauldicker]

I have been asked by a customer to quote for the wiring to a hot tub. I have not done one yet so some advice would be appreciated.

consumer unit is a lewden, i plan on using 6mm 3core swa (max distance 20m) to a weatherproof isolator, then to a female blue commando socket required by the company. Can only find ip44 at present looking for an ip56 as it will be outdoors albeit under a lean too.

so here's the question the company want provided a 16A mcb/rcbo type c,
I cannot seem to find a type c Lewden rcbo , is there a compatible brand?
Am I correct in thinking that the commando socket has to be at least 2.5 m away from tub as per 17th edition for swimming pools. Or more than 2.5 m high?

Anything else I need to consider.

 

[Pauldicker]

This is obviously where I have gone wrong! As referring to my on site guide 7.2.5 I was not aware that swa was exempt as I just believed it would protect the cable from mechanical impact. However I also thought that it was not more than 3mm thick and could be damaged, but on reflection as it's clipped direct, it's unlikely to be damaged. My bad. However I still don't see the harm protecting the whole circuit, and finding a compatible rcbo is a cheaper way of doing it as believe that modular commando sockets are quite expensive.

If I'm wrong it's something new that I have learned.

 

[Richard Burns]

This is obviously where I have gone wrong! As referring to my on site guide 7.2.5 I was not aware that swa was exempt as I just believed it would protect the cable from mechanical impact. However I also thought that it was not more than 3mm thick and could be damaged, but on reflection as it's clipped direct, it's unlikely to be damaged. My bad. However I still don't see the harm protecting the whole circuit, and finding a compatible rcbo is a cheaper way of doing it as believe that modular commando sockets are quite expensive.

If I'm wrong it's something new that I have learned.

If you consider that SWA has an earthed metallic covering (so long as you earth the armour!) and then read 7.2.5 in the OSG again and see the requirements that do not relate to cables with earthed metallic covering this may help.
As you say no problem with protecting it with an RCD, you just need to be aware that it may well not be required.

 

[Pauldicker]

If you consider that SWA has an earthed metallic covering (so long as you earth the armour!) and then read 7.2.5 in the OSG again and see the requirements that do not relate to cables with earthed metallic covering this may help.
As you say no problem with protecting it with an RCD, you just need to be aware that it may well not be required.

Richard thank you for explaining that.

 

[davesparks]

This is obviously where I have gone wrong! As referring to my on site guide 7.2.5 I was not aware that swa was exempt exempt from what? as I just believed it would protect the cable from mechanical impact. However I also thought that it was not more than 3mm thick what on earth has 3mm thickness got to do with anything? and could be damaged, but on reflection as it's clipped direct, it's unlikely to be damaged. My bad. However I still don't see the harm protecting the whole circuit protecting it from what? RCDs dont protect cables!, and finding a compatible rcbo is a cheaper way of doing it as believe that modular commando sockets are quite expensive.

If I'm wrong it's something new that I have learned.

What exactly do you think an RCD protects?

 

[davesparks]

If you consider that SWA has an earthed metallic covering (so long as you earth the armour!) and then read 7.2.5 in the OSG again and see the requirements that do not relate to cables with earthed metallic covering this may help.
As you say no problem with protecting it with an RCD, you just need to be aware that it may well not be required.

Earthed metallic covering is irrelevant, no cable requires RCD protection purely due to it being clipped direct.

 

[infinity]

You probably don't even need a modular commando! One I done recent required a commando,
So I supplied a rotary isolator, then a flex out of that with a commando plug on the end to plug into the hot tub. Job done and the flex and plug are hidden under/ inside the hot tub