Earth resistance measuring with 4 terminal earth tester malayalam(എർത്ത് വാല്യു കണ്ടുപിടിക്കുന്നത്?)

earthing most important part of an electrical installation.Minimaum value of an domestic installation is 3 to 5 ohm .in industries maximum ohm but in transformer earthing maximum .0.5ohmsThis measuring processes easy and very less time required. 1,#earth tester 2.#earth testing 3,#waco tester 4,#earth value measuring malayalam 5,#soil resistivity 6,#4terminal earth tester 7,#house wiring