Grounding or earthing is very important for the Lightning & Surge Protection System. The proper design and installed of earthing system can safeguard both lives and sensitive electronic / electrical equipment. In general the proper earthing system which have good equipotential integrated grounding configuration will be the priority than the value of earth resistance. The grounding must have: Good corrosion resistance.- Integrated grounding of which will have the same value of earth resistance for each point. Ability to dissipate the lightning current & energy to ground.- The demension and configuration of integrated grounding is more important than the earth resistivity.

some examples of applicable grounding system

the type,dimension & the configuration of grounding is more important than earth resistance value