Some engineers ask for the combining of transformer neutral and body earth together … while some experts say that distribution transformer should have separate earthing for neutral and body.
What are merits and demerits of both.
There is a standard to make them seperate. please find it and u will get it. okay now lets answer your question easily , see if you have a mixed node of earthing , you will not be able to find out the circulation current path of the earthing. In this case few complexity may arise , specially if you have complex grid or in a machine yard and in swithchyard. you may face various complexity , specially yout earthing relay triping parameter.