I'm a EE working on a scientific instrument that is large in scale, like a building. The structure is all metal and will have many server cabinets and electronics equipment, motors, sensors spread all over it. It is not yet built.
Power is supplied from a local utility feed to the instrument as 3-phase AC power where both 3-phase and single phase can be utilized. The 3-phase includes L1, L2, L3, N, and PE. PE is tied to earth ground and Neutral at the utility feed.
There is a strange requirement to keep the PE from the power source isolated from the structure itself. Equipment with a metal chassis must either have its PE-connected chassis isolated from the structure or the equipment's chassis can be bolted to the structure if PE is disconnected inside. They say this is to reduce noise and ground loops.
For example, if I installed a rack computer, I would need to either isolate the chassis from the structure or remove any PE connection from its power plug to its chassis to isolate it. Then ensure the chassis is bolted to the rack which is bolted to the instrument chassis for safety ground.
I believe that they're confusing PE with an actual current carrying conductor. They keep calling it Ground. I can't make any sense of it. Perhaps I'm misunderstanding the requirement. Have any of you ever heard of something like this?