Combined and Individual Earthing Why Earthing Is Provided to All Power System Because Earthing Is very Important to all equipment's. It will Be Most Important For Industries And Power generation and substations, it will be more focus is given by Engineers. More Kilo or Mega Voltages is very dangerous for Humans, it is protected by Normal Earthing. It will advanced Protected Combined and individual earthing. In Industries and Sub-stations we install special power system like Combined and individual earthing will be checked every one year one Combined value should be greater then 3ohms and Individual value should be less than 1 ohm. Thanks For watching... our Youtube video Name: Electrical Technology Tamil Our Motto: EVERTHING WILL BE KNOWN EVERY THING....