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.
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