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tell me the operation of ELCB. How it detects a fault?
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Answer Posted / rupali burnwal
A voltage-sensing ELCB does not sense fault currents from
live to any other earthed body.so current type ELCB is used.
ELCBs have one advantage over RCDs: they are less sensitive
to fault conditions, and therefore have fewer nuisance
trips. (This does not mean they always do, as practical
performance depends on installation details and the
discrimination enhancing filtering in the ELCB.) Therefore
by electrically separating cable armour from the cable
circuit protective conductor, an ELCB can be arranged to
protect against cable damage only, and not trip on faults in
downline installations.
There are two types of ELCB.One-VOLTAGE operated & Current
Operated.A voltage-operated ELCB detects a rise in potential
between the protected interconnected metal work (equipment
frames, conduits, enclosures).They operate at a detected
potential of around 50 volts to open a main breaker and
isolate the supply from the protected premises.
The earth circuit is modified when an ELCB is used; the
connection to the earth rod is passed through the ELCB by
connecting to its two earth terminals. One terminal goes to
the installation earth CPC (circuit [[Power system
protection |protective]] conductor, aka earth wire), and the
other to the earth rod (or sometimes other type of earth
connection).
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