ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Three phase lighting....... neutral too small ?

Hi there

So.... I have a question.......

I'm on a job where the lighting is 600x600 grid lights (4 28w tubes each fitting) and there are some motors around, so the lighting is spread over three phases - it's switched by a single pole switch running a 4 pole contactor (3 phases 1 neutral).

The contactor is remote - the supply cable from the contactor to the "splitter" if you will is ~30m then three flexes come out of this box to the three groups of lights. The flexes are, I would say, around 50m each.

Each "phase" is running at ~4 amps.

The supply SWA is 2.5 XLPE 4 core. The flex is 3183Y 1.5mm (3 core 1.5mm)

So whats the question?

Isn't the SWA neutral going to be working too hard ?

I've always been cautious about running a three phase supply to run 3 single phase light groups, even for stroboscopic reasons, and would love to have some comments thereon......