ECN Forum Forums General Topics of the Trade General Discussion Area Is this an unsafe practice?

I am not an electrician , but was curious about this. Im working on a job where a large piece of packaging machinery is being installed. The 3 phase and ground for the equipment comes directly from the building service panel to an electrical enclosure on the machine, but there is no dedicated neutral. The electrician on site has taken one leg of the 3 phase power to ground (in the machine electrical enclosure) to derive the 120 volts for control circuitry. Is this is a normal practice and is there any related concerns, safety or otherwise?

Thanks