jerryatric
Member
- Location
- florida
These questions are pertaining to utilizing a shore power system (480 volt ungrounded delta ) to power painting , blasting and hvac equipment on a construction site. While I have installed these systems I have never used one in this manner. I believe said usage would be code compliant : all equipment grounding conductors will be in place and the building has an extensive ground grid with many grid to building steel connections , transformer case to ground grid to building steel to EGC's will be verified , double ended sub station has a ground detector at each end , signage as per code will be
installed. Electrical personnel will be on site at all times . Some vendor supplied temporary panels will be utilized , installed breakers in panelboards are straight 480 or 600 volt rated. Worker safety is my greatest concern , however if I understand correctly this system would be comparably safe to a grounded wye system providing all equipment grounding is installed as per code. On reading older posts it seems damage to electronics can be more of a problem on this system , which is a concern since most of said equipment employs vfd or soft start control. The substation has surge suppressors at each end ; these we will upgrade . Any thoughts , help or advice is greatly appreciated.
installed. Electrical personnel will be on site at all times . Some vendor supplied temporary panels will be utilized , installed breakers in panelboards are straight 480 or 600 volt rated. Worker safety is my greatest concern , however if I understand correctly this system would be comparably safe to a grounded wye system providing all equipment grounding is installed as per code. On reading older posts it seems damage to electronics can be more of a problem on this system , which is a concern since most of said equipment employs vfd or soft start control. The substation has surge suppressors at each end ; these we will upgrade . Any thoughts , help or advice is greatly appreciated.