Do I need a 20amp fused spur supply for a Hot Tub installation ?

Ray wrote:

Do I need a 20amp fused spur supply for a Hot Tub installation ?

Whats the rating plate on the hot tub heater say? I suspect the
answer will be no though, as a 20A load on a spur on a ring isnt
really a good idea..


NT

Have not bought the hot tub yet just getting the electrics sorted.

Supply is coming direct from the CU, it is 4mm armoured cable going to an
outside log cabin.


wrote in message
ps.com...
Ray wrote:

Do I need a 20amp fused spur supply for a Hot Tub installation ?

Whats the rating plate on the hot tub heater say? I suspect the
answer will be no though, as a 20A load on a spur on a ring isnt
really a good idea..


NT

On Sep 26, 3:15 pm, "Ray" wrote:
Have not bought the hot tub yet just getting the electrics sorted.

So, do you think we're all clairvoyants? Why not ask the hot tub
supplier what kind of supply it needs?

I can see from my crystal ball that you'll probably top post again.

MBQ

On Wed, 26 Sep 2007 15:15:36 +0100, Ray wrote:

Have not bought the hot tub yet just getting the electrics sorted.

Supply is coming direct from the CU, it is 4mm armoured cable going to an
outside log cabin.


wrote in message
ps.com...
Ray wrote:

Do I need a 20amp fused spur supply for a Hot Tub installation ?

Whats the rating plate on the hot tub heater say? I suspect the
answer will be no though, as a 20A load on a spur on a ring isnt
really a good idea..


Might be limited on Voltage drop. Max length is 4% of 230V = 9.2V
4mm² is 11mV/A/m which makes 9.2V/0.22V = 41m. So probably OK.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

Distance from CU is 20 metres.


"Ed Sirett" wrote in message
...
On Wed, 26 Sep 2007 15:15:36 +0100, Ray wrote:

Have not bought the hot tub yet just getting the electrics sorted.

Supply is coming direct from the CU, it is 4mm armoured cable going to an
outside log cabin.


wrote in message
ps.com...
Ray wrote:

Do I need a 20amp fused spur supply for a Hot Tub installation ?

Whats the rating plate on the hot tub heater say? I suspect the
answer will be no though, as a 20A load on a spur on a ring isnt
really a good idea..


Might be limited on Voltage drop. Max length is 4% of 230V = 9.2V
4mm² is 11mV/A/m which makes 9.2V/0.22V = 41m. So probably OK.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

On 26 Sep, 15:15, "Ray" wrote:
Have not bought the hot tub yet just getting the electrics sorted.

Supply is coming direct from the CU, it is 4mm armoured cable going to an
outside log cabin.

What earthing system are you using for that Log Cabin?

On Wed, 26 Sep 2007 11:13:16 +0100, Ray wrote:

Do I need a 20amp fused spur supply for a Hot Tub installation ?

Have you thought to ask the supplier/manufacturer?

--
the dot wanderer at tesco dot net

On Sep 26, 4:01 pm, "Ray" wrote:
Distance from CU is 20 metres.

"Ed Sirett" wrote in message

...



On Wed, 26 Sep 2007 15:15:36 +0100, Ray wrote:

Have not bought the hot tub yet just getting the electrics sorted.

Supply is coming direct from the CU, it is 4mm armoured cable going to an
outside log cabin.

wrote in message
oups.com...
Ray wrote:

Do I need a 20amp fused spur supply for a Hot Tub installation ?

Whats the rating plate on the hot tub heater say? I suspect the
answer will be no though, as a 20A load on a spur on a ring isnt
really a good idea..

Might be limited on Voltage drop. Max length is 4% of 230V = 9.2V
4mm² is 11mV/A/m which makes 9.2V/0.22V = 41m. So probably OK.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is athttp://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQhttp://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQhttp://www.makewrite.demon.co.uk/BoilerChoice.html- Hide quoted text -

- Show quoted text -

My crystal ball was correct.

MBQ