Ring main help

[Mark.W]

Hi

I was wondering if someone could give me some guidance on a ring main please?
The ring consists of 21 CCTV columns drawing 5A each. The total length of the ring will be 1600m.

Is there a calculation I can use to calculate correct cable size and breaker rating?

Many Thanks
Mark

 

[dean.diy]

davesparks... I thought it funny at the time after some Guiness. Bit stupid now I read it again. Still feel the OP was getting a liitle too much flack.

 

[Lucien Nunes]

If they have LED illuminators then driver inrush might be a problem, and although the running current isn't 5A it might be necessary to design as though it was, unless sequential on-delay timers can be fitted.

 

[Engineer54]

You being misunderstood Eng.?????

I find that hard to believe.

It happens, my fault on occaisians, especially first thing in the mornings before i've had my second wake-up coffee!! lol!!

 

[Knobhead]

It would work out a damn site cheaper to hire a consultant!

 

[GB.Kayak]

It would work out a damn site cheaper to hire a consultant!

What would 'work out cheaper'? ... and would it? It is interesting how we all scramble over each other to help one moment, and the next suck our teeth and say get an expert in. Besides which, in my experience consultants borrow your watch to tell you the time and often charge an exorbitant rate to do so!

 

[Knobhead]

Savings on material costs alone would more than offset the consultant fees.

 

[shanky887614]

What would 'work out cheaper'? ... and would it? It is interesting how we all scramble over each other to help one moment, and the next suck our teeth and say get an expert in. Besides which, in my experience consultants borrow your watch to tell you the time and often charge an exorbitant rate to do so!

of course it would work out cheaper the fools are asking for 100amps to feed the pillars not accounting for vd over 1.6km

im guessing around 95mm ring lol

 

[Leesparkykent]

of course it would work out cheaper the fools are asking for 100amps to feed the pillars not accounting for vd over 1.6km

im guessing around 95mm ring lol

And maximum EFLI lol

 

[shanky887614]

And maximum EFLI lol

i meant 95mm 4c swa lol was randomly chucking numbers in a random calculator to get 95mm
4% vd at middle of the ring lol


just for a laugh 4c 185mm swa works out at 4% vd over 1600m for a radial

 

[Silly Sausage]

if he has then it will be the most over specced rfc ever. just imagine a few cctv cameras powered by a 95mm rfc.

im guessing around 95mm ring lol

Is there an echo in here, or you being ignored again Tel?!?!

 

[shanky887614]

Is there an echo in here, or you being ignored again Tel?!?!

tel who? didnt see his post