On Jun 14, 12:14*pm, GC wrote:
On Jun 14, 8:33*pm, stevelup wrote:



On Jun 14, 6:50*am, GC wrote:

Sorry.....Also has a 3 KW heater..

Are you on 230V there?

Your total load is 8.45kW which is 36.74 amps. You would need 6mm
cable to meet the minimum voltage drop requirement here in the UK.

But - having said all that, I don't think you have listed the specs
correctly. Are you sure it really has two pumps rated at 2.25kW each?
That seems excessive to say the least - are you sure it doesn't have
two *heaters* rated at 2.25kW each? That seems more likely...

Assuming the extra 3kW you added on there at the end is a mistake,
your total load would be 5.45kW which is 23.7A which would be fine
with 4mm cable over 27M

Steve

Steve

Hi Steve

Thanks for your reply...Yep..The supply is 230V / 50 Hz give or
take... Rechecked the specs - Pump 1 - 2.25Kw, Pump 2 - 2.25Kw, Blower
for Air Jets - 700w, Circulation Pump - 250 W and heater - 3Kw...

Now from further research I don't ' think' you run the 2 pumps AND the
air jet pump at the same time...Its one or the other...

But yes, definintely 2 main pumps rated at 2.25Kw each...It seats upto
8 people...A big beast of a spa...

I don't understand the manufacturers rating then - they quote 32A
supply required yet it is going to draw almost 37A. It looks like the
advice your importer gave was correct rather than the manufacturers
information.

Cable run is 23 to 25 metres max..Into an IP56 rated switch and out
into the Spa connection. The total length quoted includes the 2 metres
on the spa side of the switch. So roughly 22 metres from fusebox to
switch and a couple from switch to spa..

Am I correct in thinking that the 4mm is being pushed to its max...It
is generally clipped to top of joists in loft space, and run down
plastic trunking inside a cupboard before exiting the building into
the switch.

It's outside of regulations here in the UK. The voltage drop would be
too great over that length on a 40A MCB. The regulations may differ
where you are and that may be why your electrician is saying 4mm is
OK.

You could ask him for his calculations - ie. on what basis is he
asserting that 4mm is adequate.

Steve