Power connections are usually bolt type connections. This kind of connection make wires come normal to Z axys.
Usually, the same component can be wired from different sides depending the unit it is mounted to.
Or can be wired from different sides on the same unit.
This makes that you should create as much CSYS (ports) as directions you think you will come from. Every CSYS with a different name.
But when you work with RSD an export logical informatio to Creo you usually only have one port name.
To have as much ports as directions on RSD would not be reliable.
An entry_port that could allow connecting cables 360º around the Z axys (or angle adjustable?) would solve this.
A property for entry_ports could be added to be able to chose wich kind of connection allows that port.
Example of a real connections: