3 Phase cable

[wilber]

I want to run 3 phase from one building to another a distance of roughly 30 meters.

Now I have some 3 phase cable here that is long enough, the question is its the stuff they brought the overhead line in with. Can i use this? It has 3 cores, a copper core (earth) then lots of small blue cables (neutral) can the small neutrals be fixed together at each end or does it need to be a thicker single core neutral?

Picture here to help you understand.

 

[wilber]

Anyone?

 

[Blue.]

Anyone?

By rights your supposed to use 4 core,if I was doing it myself I'd use your cable,a sparky will tell you it has to be 4 core.

 

[Steevo]

I'd expect the sparky to want new cable, right colours etc.

 

[Lincsman]

What do all the little blue ones do?.. cut down interference or something?

 

[David.]

Is your cable the stuff that the grid operator uses underground for incoming supply? By all accounts they do not use ordinary SWA cable, was told this by Western Power last week whilst sorting a meter move, shall find out in due course.

 

[f0ster]

you are allowed to use two core for supply, the armour being earth as well as protection, but only above a certain core size, there is a table listing the requirements, with the cable shown the blues join together to form the neutral,

 

[wilber]

Is your cable the stuff that the grid operator uses underground for incoming supply? By all accounts they do not use ordinary SWA cable, was told this by Western Power last week whilst sorting a meter move, shall find out in due course.

Yes it is. It will be going in ducting underground.

 

[defender]

it looks like 3 phase split concentric cable and will be fine
The idea for neutral in small wires is so that it cant be tapped to steal power before the meter
What are the 3 colours ?