Limitations of ELCB

Some limitations of ELCB are listed below:

  • Failure to respond at certain conditions.
  • As we know the disadvantages of ELCB as that ELCB needs a sound earth connection, for the load protects.
  • ELCB does not detect a fault that doesn't pass current through CPC to earth rod.
  • ELCB does not allow a single building system to easily split into multiple sections with independent fault protection because the earthing system is bonded to the pipework.
  • Some electrical leaky appliances water heater, washing, machine, and coolers may cause CKL to trip.
  • ELCB may be tripped by the external voltage from something connected to the earthing system such as a metal pipe.
  • This breaker may be tripped by external voltage from something connected to the earthing system such as metal pipes.
  • If the electrical installation earth rod is placed close to another or the same of the earth of a building, then a high earth leakage current from other buildings can raise the local ground potential and cause a voltage difference across the two earth, again tripping to the ELCB.
  • They introduce additional resistance and an additional point of failure into enough voltage to cause it to trip.
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