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

 

[keniff]

I think it will be much much lower

 

[rich spark]

I may have missed something so i could have it wrong. Its also in ducting. Think i had 16mm at a loss of 11.6v. Which may affect the operating of camera. So i jumpd to the nextsize and calcd.

 

[Silly Sausage]

If you get it down to 12A, by my quick calcs (too early for me!), you could use two 6mm cables (6A per circuit).

 

[rich spark]

Ive got 8amps and then 4amps at last point being drawn.

 

[Silly Sausage]

Take 2A off the longer run to feed some of the mid point gear, perhaps...6A/cct.


edit...
Or,
Another quick check, 8A 6mm for 175m
4A 4mm for 260m

 

[rich spark]

Thanks, will look into that. Both from same 16amp rcbo? Or better on individual breakers.

 

[Silly Sausage]

Separate circuits.

 

[Knobhead]

If you run the first ⅔ in 10mm and the final ⅓ in 6 mm @ 6A per drop the cumulative VD at the end will be 5.69%. RCD to suit the smallest cable.

 

[rich spark]

Thanks all. Thinking of 16mm radial carrying 12amp. Wired in 16mm swa. Terminated into a galv enclosure and downsized to the sockets. protected by an rcd at DB.
Would give me an 8v drop. And 1 more question, the best way to join the cores?

 

[Octopus]

Thanks all. Thinking of 16mm radial carrying 12amp. Wired in 16mm swa. Terminated into a galv enclosure and downsized to the sockets. protected by an rcd at DB.
Would give me an 8v drop. And 1 more question, the best way to join the cores?

I'd be tempted to use Wiska boxes and Wago's

 

[telectrix]

16mm wagos???

 

[Octopus]

16mm wagos???

The new ones! OK, bad suggestion!

That said I prefer Wiska boxes!

 

[Guest154]

holy **** !!!!!! 25mm -16mm swa to supply 4 cameras am i the only one that thinks this is crazy , 4 CAMMERAS ARE THESE MOVIE CAMERAS

 

[rich spark]

Normally a 4mm max i use, but VD has caused a 16mm cable im afraid. Thanks for all advice.

 

[Guest154]

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