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Answer Posted / guest
ELCB is basically voltage operated tripping mechanism.When a
voltage exists between the earth and frame the tripping coil
is activated.If the earth connection is bad the tripping coil
will not operate.
RCCB is an improvement of the voltage operated tripping
mechanism.This is current operated. If the leakage current is
of the designed minimum amount the tripping mechanism is
activated.So if the earthing connection to the ground is bad
but the leakage occurred through a person to the ground the
RCCB will still trip.
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