swa help

[rich spark]

Hi guys. Little bit of guidance required please. Have a 260m run to carry a total of 16amps. Just to supply 4 sockets.
Im done my calcs and come out with a size of 25mm 3core swa which will give me a VD of 7.28
The cpc will be plenty big enough after calcs show an 8mm required.
As 25mm impossible to terminate into a socket!!
Was wondering the best way to go about it, would a submain to a DB over half way, and two 16amp mcbs to suply 2x radials be best?
Or submains to 1st point, and then to the 2nd point? So id have two DBs on 1 SWA with one 16amp mcb in each for sockets. Any response greatly apreciated. Thanks

 

[Guest55]

r u for real? change the sockets to spurs and voltage drop does not come into it

so your saying volt drop has no relevence on a circuit over 200mtr long ?

oh dear.

 

[Guest154]

post the spec sheet for the cameras before u go out and spend over a grand for cable that is not needed

 

[Guest154]

go and read the regs for voltage drop

 

[Guest154]

GN3 2.7.19 verification of voltage drop

 

[Landril]

Wow need to buy the cable u use Cortez if u don't get VD over 200m !!

 

[Guest55]

gn3 isnt the regs is it ?

and how does changing a socket to spur make any difference to v.d. ?

 

[Plonker 3]

r u for real? change the sockets to spurs and voltage drop does not come into it

So if he used spurs he could use 2.5 mm.

Are the cable manufacturers aware of this new concept that exisits only in your mind?

 

[Guest154]

the spec sheet will tell u what the min voltage the cameras will work at , do the calcs and as long as its above that min then u are fine , as long as the sockets are for the camera use only

 

[Plonker 3]

But you said volt drop doesnt matter if he was to use spurs instead of sockets.

 

[Guest154]

yes to supply cameras and no other appliance was to be plugged in

 

[Guest154]

ie: change to spurs and no one could come along and plug something else in

 

[Plonker 3]

Volt drop applies to every electrical circuir regardless what voltage is used.or what is connected to it. A camera doesnt get special dispensation.

 

[Guest154]

is that in the regs?

 

[Guest55]

i would expect cameras to work at 220-240v just like any other piece of electrical equipment licensed for sale in the UK.
the max v.d. limit of 5% for power is set by bs7671 , not any manufacterer.

 

[Plonker 3]

is that in the regs?

Is what in the regs?