Lyle,
Thanks for that.
Yes, harmonic currents are always in the back of my mind with these types of installations, I've had problems with them in the past.
100 points sounds a bit over the top, but I fail to see how you can have this many SMPS units on one supply(even 3phase).
I've never seen an office of this size(50x50m,by memory), having 100 PC's in it. [Linked Image]