How to measure good earthing and bad earthing using multmeter | How to measure current or voltage linkage at your house ,office or industry

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Voltage (an electromotive force or potential difference expressed in volts) is the pressure from an electrical circuit’s power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light

An electric current is a flow of electric charge. Electric charge flows when there is voltage present across a conductor. In electric circuits this charge is often carried by moving electrons in a wire.

  By using multmeter can know good earthing or bad earthing

How can do?
Set multmeter in  AC voltage measuring mode.

 Measure voltage as follows,

MEASURING
 VALUE
  Live with Neutral (L-N)
 230V
 Live with earthing (L-E)
 230.1V
 Neutral with Ground/earthing (N-E)
 0.8V

 Voltage leakage = (L-E) – (L-N) + (N-E)
                           =230.1V-230V+0.8V
                           =0.9V
So earthing is good (OK)
MEASURING
 VALUE
  Live to Neutral (L-N)
 230V
 Live to Ground/earthing (L-E)
 17.1V
 Neutral to Ground/earthing (N-E)
 0.7V
 Voltage leakage = (L-N) – (L-E) + (N-E)
                           =230V-17.1V+0.7V
                           =213.6V
So earthing is bad (NOT OK)

NOTE;

EARTHING IS BAD (NOT OK) WHEN VOLTAGE LEAKAGE IS GREATER THAN 5V 

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