# Summerhouse Electric Supply

Ban-All-Sheds wrote...
> Nevertheless, if you ar digging a trench & laying conduit, why not
> run a couple of lengths of shielded Cat6, just in case?

Same goes for in case he ever wanted alarm protection of the summerhouse, or a remote camera over IP.

People do sometimes later want alarm protection of outbuildings, and whilst wireless alarms can be reliable that comes at quite a price usually.

Not needed, as have a 54g wireless network in the house which also covers the garden. Have a cordless phone.
Nevertheless, if you ar digging a trench & laying conduit, why not run a couple of lengths of shielded Cat6, just in case?

I am only laying the 6mm SWA for the power supply, I am not laying a conduit

I will be insulating the summerhouse, to help keep it warm in winter.
Watch you don't turn it into a sweatbox in the summer.

Maybe consider an small aircon unit instead of the heater...

The summerhouse has 2 medium sized opening windows on the side of it

Here are some Pictures of the Summerhouse:

Starting to lay the base:

The finished base (Side view):

The finished base (Front view):

The Parts of the Summerhouse:

Side view of the Summerhouse:

Front view of the Summerhouse:

With the TLC calculator you used 3c, try it again with 2c as I have a feeling the calculator takes you as meaning you are using a 3 phase supply when using 3c.

It does.

Have you finsihed the kitchen now?

With the TLC calculator you used 3c, try it again with 2c as I have a feeling the calculator takes you as meaning you are using a 3 phase supply when using 3c.

Using the TLC Calculator with 3core gives:

Cable = SWA 3 Core XLPE

Voltage = 230

Length Of Run = 40m

Required Cable Size = 4mm

VD = 8.7v

PD = 3.8%

Using the TLC Calculator with 2 Core Gives:

Cable = SWA 2 Core XLPE

Voltage = 230

Length Of Run = 40m

Required Cable Size = 6mm

VD = 6.9v

PD = 3%

Yeah, so you need 6mm
Working out the volt drop, from table 4E4A in the regs, 4mm Two core cable single phase AC has a VD of 12 mV/A/m. 6mm is 7.9 mV/A/m.
Three or four core refer to 3 phase AC.
(note that if you are not using 90ºC accessories then you may want to use table 4D4A.)

From your design current 4mm gives, (21.74 x 12 x 40)/1000 = 10.44 V
Same for 6mm, (21.74 x 7.9 x 40)/1000 = 6.87 V.

The reasoning behind using the 2c VD for 3c cable is you are still only using 2 of the cores as live conductors.

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