Hot Tub G.F.C.I.

Zoomup: 
 

I inspected a hot tub today. It is situated outside and was warming the outside air nicely, even with its covers on.

Anyway, a plate required it to be protected by a Class A G.F.C.I. Does anyone know the specs on such a beast please?

Ground fault circuit interrupter = RCD.

ETA, “class A” may not be the same as we know it.

Chris Pearson: 
 

Zoomup: 
 

I inspected a hot tub today. It is situated outside and was warming the outside air nicely, even with its covers on.

Anyway, a plate required it to be protected by a Class A G.F.C.I. Does anyone know the specs on such a beast please?

Ground fault circuit interrupter = RCD.

ETA, “class A” may not be the same as we know it.

So, exactly what is Class A?

Z.

Well, certainly not what I was in when I were at skool that's for sure! 

Zoomup: 
So, exactly what is Class A?

Uncle Google is your friend. It seems to be a Canadian thing.

Chris Pearson: 
 

Zoomup: 
So, exactly what is Class A?

Uncle Google is your friend. It seems to be a Canadian thing.

I didn't know that Norfolk was a Canadian Province.

Uncle Google he do say (notice the Norfolk dialect)

“Ground Fault Circuit Interrupter, Class A (Class A GFCI) – a ground fault circuit interrupter that will interrupt the circuit to the load, within a predetermined time, when the ground fault current is 6 mA or more but not when the ground fault current is 4 mA or less (see Appendix B).”

Where do I find one of those then?

Z.

Is it the Zoom`s Weekend Quiz under another name ?

You don't Z, you fit protection as defined in BS7671. This is a case where “manufacturer's instructions” are not relevant to our completely different electrical system and regulations.  It is likely that this product should not be sold here labelled in this way, does it have a CE mark, or a CSA one? Is the product marked for a 230V supply? You may well find many other inconsistencies, but that does not stop you from using your knowledge and experience to check the product installation safety. 

davezawadi (David Stone): 
 

You don't Z, you fit protection as defined in BS7671. This is a case where “manufacturer's instructions” are not relevant to our completely different electrical system and regulations.  It is likely that this product should not be sold here labelled in this way, does it have a CE mark, or a CSA one? Is the product marked for a 230V supply? You may well find many other inconsistencies, but that does not stop you from using your knowledge and experience to check the product installation safety. 

The hot tub is rated at 32 Amps 230 Volt. It is supplied via a 30mA R.C.D. and a B32 M.C.B. The submain supplying it to the boathouse consumer unit is perhaps 80 metres long and is 16.0mm2 S.W.A. I was adding new circuits in the boathouse so was considering loading and Voltage drop.

Z.

In my view this requires a 10ma RCD and not the more common 30ma type.

One could reasonably argue that full compliance with the Canadian regulations is unreasonable when installing the appliance in the UK. BUT IMHO, one should meet those regulations “so far as is reasonably practical” which means a 10ma RCD as being the nearest readily available equivalent.