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SWA cable to a swim spa

 
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scott123



Joined: 07 Jun 2008
Posts: 3
Location: UK
PostPosted: Sat Jun 07, 2008 9:50 am    Post subject: SWA cable to a swim spa Reply with quote
I am putting a swim spa in the garden in a purpose built shed, regarding the power it needs a supply of up to 55 amps

What thickness of SWA cable will I require to run in to the shed?
Would 16mm do it, it does say on a page that I was looking at that the 16mm cable is rated to 94amp so would this be as sufficient as it sounds.

I would also be looking to have a low voltage light and power socket in the shed.

I shall be getting an electrician to fit/wire it up but wanted to get the cable in ready before hand.
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scott123



Joined: 07 Jun 2008
Posts: 3
Location: UK
PostPosted: Sat Jun 07, 2008 10:13 am    Post subject: Reply with quote
ok I have done some more research, I would like this checked and verified but I will explain it incase someone else comes across the same problem.

There is a calculator here:
http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

However that calculator needs the load in watts, which I don't know, however after reading here:
http://www.powerstream.com/Amps-Watts.htm

it seems it can be worked out.

amps x volts = watts

I need 55 amps
Volts would be 220
If so 55x220 = 12100 watts

If I put 12100 into the calculator and choose 3 core xlpe cable over 55 metres then it says 16mm is fine, that doesn't take into account a light or a socket mind so I woudl still like someone to comment if possible.
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vince knight
Moderator


Joined: 04 Mar 2004
Posts: 1270
Location: Essex/East London
PostPosted: Sun Jun 08, 2008 11:34 pm    Post subject: Reply with quote
The biggest factor would be the length of run to be able to calculate the volt drop.

Vince
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scott123



Joined: 07 Jun 2008
Posts: 3
Location: UK
PostPosted: Mon Jun 09, 2008 7:20 am    Post subject: Reply with quote
Hi Vince, the run would be around 50 metres.
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vince knight
Moderator


Joined: 04 Mar 2004
Posts: 1270
Location: Essex/East London
PostPosted: Mon Jun 09, 2008 7:56 pm    Post subject: Reply with quote
16mm it is then Very Happy
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