LED lighting circuit HELP!!!

[spark e]

I work at a heavy industry as a maintenance spark!
we are having the yard area extended and some new plant equipment/ machinery installed, part of the new yard extentions is a raised metal gurder walkway 300 meters in length, there are 20 lamp post along the walkway each with 2 x 80watt LED lighting modules on every post so the total load for these lights is80 x 40= 3600 watts -13.9amps total current demand,the BOSS says he wants a 2 way switch at either end of the walkway an though i have tried to lead him down the path of photocells he will not have it.
we have been left a 32 amp isolator by a contracting company in the yard which will feed these lights at source but we will be adding a 16 amp breaker downstream.
we have had some cables dropped at work to feed these sed lights, the cable is SWA 16mm2, my first thought was this had to be wrong ,,,lol....
but after calculating the volts drop along the 300 meters it appears to be correct cable size..in the past i have done some carpark lighting circuits but we never used an cables of this size!!
we would never in a million years get these cables into the terminal housing provided by the post manufacturer so we would have to terminate into an adaptable box under the walkway under every post then come out of the post in lets say 2.5mm2 to the terminal housings....
just seems like regs gone mad to me!!!

So my question is does this 16mm2 cable seem seem right to you guys????
any information or advice would be great.....

 

[Marvo]

.....there are 20 lamp post along the walkway each with 2 x 80watt LED lighting modules on every post so the total load for these lights is80 x 40= 3600 watts -13.9amps total current demand,

Does the 80w refer to the consumption of the LED or is it the power requirement of the lamp plus driver etc? If it's just the rating of the lamp I'd investigate the total load of the fitting which may be considerably more.

 

[VoltzElectrical]

Terminate the 16mm into cut-outs for lamp posts and you will be fine.

 

[Octopus]

Watch out for high start up currents with LED fittings!

 

[VoltzElectrical]

like this. cable into bottom, cable drop into top, or have i mis-read the post?

 

[spark e]

when these lights , lamps came from germany there was no info that came with with them, the only clue was the 80 watt sticker stuck on each lamp , to be honest i know this requires further investigation and i have not done a great deal with LED lighting mods, inside there is a small transformer but i cannot remember the the rating of it..i will check tomorrow... the thing that puzzles me is the cable size , my foreman called edmundsons the supplier to question this matter and they say they have calculated the length of cable run to the design current and are convinced they have supplied the correct size, but i am convinced something may be a miss.

 

[spark e]

yes like this but they are not big enough for 16 mm2 cables

 

[Darkwood]

Amongst other things to consider here ... inductive inrush and OCPD time curve, liaise with the manufacturers of the lighting and control gear regarding start up spikes of multiple fittings.

300m ...Good luck with that personally i wouldn't let the cart push the horse here id be looking at other solutions and putting the pro's and con's forward, the suggested method may be the best but worth a look into it all the same.

Is their a local power source available at say every 75m where you could have sectioned supplies for the lighting with a common control pulling in the localised contactors?

 

[spark e]

View attachment 21070

like this. cable into bottom, cable drop into top, or have i mis-read the post?

yes we have these for the post to be fitted but they are not big enough for the 16mm2 cable so we would have to install a adaptable box of some description also under each post

 

[spark e]

Amongst other things to consider here ... inductive inrush and OCPD time curve, liaise with the manufacturers of the lighting and control gear regarding start up spikes of multiple fittings.

300m ...Good luck with that personally i wouldn't let the cart push the horse here id be looking at other solutions and putting the pro's and con's forward, the suggested method may be the best but worth a look into it all the same.

Is their a local power source available at say every 75m where you could have sectioned supplies for the lighting with a common control pulling in the localised contactors?

nope!!! i have thought of all that and we are ****ing into the wind mate...lol...i am going to have a word with my technical director tomorrow as i am no very happy with the design of this cicuit, but the walk way is up and the post are in place so options are getting slim....

 

[spark e]

Terminate the 16mm into cut-outs for lamp posts and you will be fine.

the posts are hollow underneath so that is no an option....there have been supplied terminal housings like the one post by another spark below like the one we have but they are no big enough for a 16mm2 cable ....