Based on previous discussions can you show how you are currently modeling these features and what problem you are trying to address by re-migrating them? It would be especially useful to know how or if you are making use of assemblies or non-spatial objects.
At a high level, the pad mounted transformers are going to be 3phase pad mounted transformers, and the PME is going to be a structure that contains 2 switches, 2 fuses, and the bus work between them. The connection between the junction box and the PME seems unusual in that the second bay of the PME isn't occupied and the third bay has two connections. You could model that like-for-like in the UN model using electric devices, electric junctions, and structure boundaries (for the cabinets) if you wanted to.
Just upstream of the PME there appears to be a junction box with an open point in it.
