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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