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the following types of earthing connections are practiced:
TT>> Earth-Earth Connection
TN>> Earth- Neutral Connection
TN-C >> Earth-Neutral Combined
TN-C-S>> Earth-Neutral Combined Segregated
one moe thing is for telecommunication
TT is the best pacticed grounding system for the facotories
TN is normally used for residential bulding in may areas/countries
the other grounding systems are installed purposely; grounding system also depends also on GFCI (Ground Fault Current Interruption) or RCD (Residual Current Device) installation requirements.
but the safer and convenient is TT.
thanks
it is all depend on your application
