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Reg 434.4 allows for omissions against fault current under certain circumstances, one being - For a conductor connecting a generator, transformer, rectifier or battery to its associated control panel.
I hope this helps you understand.
In the drawing, a transformer appears on the pillar feeder counter in a new structure with a grounding ground.
A mass cabinet feeds the main board which feeds four cable sub-boards as shown in the drawing.
Assuming that the planner chose TNCS as the method of protection in the structure, the sectional area required for the reset conductor in the drawing is: "70 mm copper conductor"
Thanks for replying however i don't think the answer is relevant to the question.
You could have the same arrangement with the gen set as it's in parallel with the LV supply - again, typically with REF looking back into the set windings and with a through fault short circuit tripping the set
You ideally need the switchboard circuit breakers to be set up for directional overcurrent as well - you don't want, for example, the LV mains supply feeding back into a gen set winding short circuit.
It would be more usual to have a gen set with source and receiving end protection (if you also need an island mode operation) and receiving end with the mains and basic reliance on the HV breaker
I think you are mixing up the requirements for control functions to those of the "raw" power.
Ideally, you would have protection on both directions for both supplies - the G59 protection being an add on via a separate relay to the mains CB along with any reverse power export criteria.
Or have I misunderstood the question ?