Question regarding 400V three phase lighting connected in Delta, without Neutral.

[AReynolds]

I am in the process of designing the electrical installation of a community centre, and have a question about the provision of three phase lighting for a large function room containing 18 36W LED fittings. All of the light fittings are to be switched simultaneously. Would it be possible to connect these lights in a three phase Delta configuration using 400V LED driver units, by connecting 6 light fittings/Drivers to each line, thereby ensuring a constant balanced load on each line? Presumably, I would not need to provide a neutral for each line, and could get away with just providing earthing for each fitting? Does anyone think that this design would be unsuitable?

 

[The Ghost]

Why no neutral, surely the driver requires it. And why not put them on a single phase?

 

[Devonchris]

My thoughts as well.
Or, if the balance of the phases is that critical then a 3P contactor.

 

[snowhead]

You're proposing 400v to the drivers, where are these to be mounted?

 

[telectrix]

for 650w of lighting, that's massive overkill. it's< 3A.

 

[The Ghost]

By the way, what size is this function room?

 

[The Ghost]

it's< 3A.

could be up to 1800A with inrush currents though or even more depending on the driver characteristics.

 

[westward10]

Of course perfectly balanced single phase loads will function perfectly well without a neutral until something fails and then things don't function so well.

 

[westward10]

Is this a wind up.

 

[The Ghost]

Of course perfectly balanced single phase loads will function perfectly well

Is that a wind up?

 

[The Ghost]

Having looked at the content of previous posts..........Mhmmm

 

[westward10]

Is that a wind up?

No because three idential single phase loads will function on a three phase supply with no neutral. Bit yes thisvall seems like a wind up.

 

[telectrix]

how can a single phase load function without a neutral, unless it's 415V s.p.

 

[The Ghost]

Ok because of the phase angle/voltage difference at each 120 degree angle but I can see that on say a single circuit like a water heater but separate circuits, that works? I can't quite think this out. Mmm maybe...why not indeed or even why

 

[telectrix]

the singlephase load requires 240V. the only way to get that from a 3 phase 415V supply is Ph -N, N being the star point.