And how will this affect neutral current on wye systems?
Assuming that these things are diodes: If all light bulbs and diodes conduct on only the positive side of the voltage waveforms, then the neutral I think will get hammered, having to supply all that single direction current, for all 3 phases. Normally, if bulb on phase A is at the positive peak of the cycle, bulbs B and C will be drawing negative current of half the peak current, per bulb. Adding up to be equal but opposite of bulb A. The diodes will block that, and the neutral has to pick up the slack. Now, if you have hundreds of bulbs in the building, and the diodes are randomly pointed (so some bulbs conduct on the negative side, and the others on the positive side, then the neutral will see less burden. So tell the installers to
not be consistent when they install the diodes. Tell them to alternate the diode direction from bulb to the next bulb.
