Wiring High bay lighting

[HandySparks]

The lights are 4 x 80w These can't be changed unfortunately, They are controlled by sensors in banks of 6 giving each bank a load of around 8.4A. With the shortest circuit being around 34meters, Within high level lighting trunking. After running the details through our magic software We are getting a cable size of 6mm!

Are you saying that, even at a circuit length of 34m, you need to use 6mm²? If so, is it cable grouping that's forcing this size of cable? It can't be volt drop at this length unless you're using a very low volt drop figure?

 

[YoungBart]

Re: Wiring High bay lighting

Originally Posted by YoungBart
After running the details through our magic software We are getting a cable size of 6mm!



Have you considered the fact that apart from the first section of cable the rest won't be carrying the full current?

Yep, That's all been taken into account, it's the first section I'm referring to.

HandySparks, unfortunately we are already tight on Volt drop due to the length of incoming cable and supply to the DB feeding the lighting.

 

[Darkwood]

Just looking at your Signature YoungBart, this is a famous Einstein quote but he was unaware at the time that there is actually a fish that does climb tree's as a survival instinct when its natural water habitat drys up - Mangrove Killifish be the strange creature and means Einstein on this occasion slipped up as that so called genius fish exists

 

[YoungBart]

Just looking at your Signature YoungBart, this is a famous Einstein quote but he was unaware at the time that there is actually a fish that does climb tree's as a survival instinct when its natural water habitat drys up - Mangrove Killifish be the strange creature and means Einstein on this occasion slipped up as that so called genius fish exists

Youll be telling me next E doesn't equal mc2 :49:

 

[davesparks]

Yep, That's all been taken into account, it's the first section I'm referring to.

HandySparks, unfortunately we are already tight on Volt drop due to the length of incoming cable and supply to the DB feeding the lighting.

If the volt drop is already tight on the distribution circuit then no amount of messing around with the lighting circuit is going to cure that and you will be stuck with big cables.


But look on the bright side, at least you don't have to worry about grouping factors

 

[YoungBart]

If the volt drop is already tight on the distribution circuit then no amount of messing around with the lighting circuit is going to cure that and you will be stuck with big cables.


But look on the bright side, at least you don't have to worry about grouping factors

That's what I figured unfortunately, Just wasn't sure if there was a certain way of wiring this type of circuit, Looks like wiring as a 2.5mm Ring has sorted it.
Thanks for all the help guys.