Not another hot tub post....

goasis · Mar 22, 2021

Hi, a friend has just sent me this snippet from their hot tub instructions asking for advice.
Its a plug in hot tub. Also specified are a 30mA circuit and a 10mA PRCD.

Any thoughts? As I said, its and inflatable, plug in, temporary hot tub

[ElectriciansForums.net] Not another hot tub post....

pc1966 · Mar 22, 2021

Does it come with the 10mA RCD in the form of an RCD-plug?

goasis · Mar 22, 2021

pc1966 said:
Does it come with the 10mA RCD in the form of an RCD-plug?

I'm not sure at the moment, I'd guess so, or else you are meant to provide one.

i=p/u · Mar 22, 2021

Normally on the plug

goasis · Mar 22, 2021

i=p/u said:
Normally on the plug

Yeah thats all cool, I was more wondering about the equipotential bonding point on the pump, its "recommend" apparently, but how would go about this practically?

i=p/u · Mar 22, 2021

If it was me I'd cut the plug off and put 16A 3p plug on it, and leave as is with the 10mA trip. Never seen it ask for that before

marcuswareham · Mar 22, 2021

goasis said:
Yeah thats all cool, I was more wondering about the equipotential bonding point on the pump, its "recommend" apparently, but how would go about this practically?

I would say bonding would be unwise on tncs,

strange that it asks for bonding perhaps it is not double insulated although would have still thought it would be taken care of within the unit using the CPC from the plug, maybe it is also sold in a country which often has un-earthed exstension leads etc

marcuswareham · Mar 22, 2021

i=p/u said:
If it was me I'd cut the plug off and put 16A 3p plug on it, and leave as is with the 10mA trip. Never seen it ask for that before

I read that as 16a 3 phase ?

i=p/u · Mar 22, 2021

3 pin , blue yoke, ipx4

littlespark · Mar 23, 2021

A lot of these have the 10mA rcd on the flex, so there’s a normal 13A plug top that can fit inside an IP socket with the flap closed. No need for a blue 3 pin.

What would you equipotentially bond it to though?
A metal fence? Exposed copper pipe to outside tap?

Midwest · Mar 23, 2021

I did a thread on the Lazy Spa tubs, I recognise those instructions, I thinks. I don't think there's a need to cut off the plug, they come with a 10mA inbuilt RCD. They are US based product, supplied here in the UK, hence the thing about grounding of the pump. I can't recall what we decided about that?