well, on that picture I cant see where any of the earths come from or go to so I couldnt possibly say.
sorry.
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it is quite likely though that you have a TNS and they have took the earth next door via the concentric/split, that would be my first guess as to why the earth enters the cutout from the ISCO
I think its a TNS with a loop feed to next door . Earth comes from the cable sheath on that strap, the one from the side of the cut out is ,as said, is the Split-con earth to next door.
So they havn't exported PME ....Phwew !!! ... that was a close one ; ) :coat