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Electric Bulb and Electric Fuse

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What is the use of earth leakage circuit breakers?

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Solution

An Earth $-$ leakage circuit breaker $(E L C B)$ is a safety device used in electrical installations with high Earth impedance to prevent shock $.$ It detects small stray voltages on the metal enclosures of electrical $.$ equipment $,$ and interrupts the circuit if a dangerous voltage is detected $.$

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Q. In an household electrical circuit:
a) Where is the MCB ( Miniature Circuit Breaker ) connected?
b) What is the function of ELCB ( Earth Leakage Circuit Breaker )?

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Which of the following correctly presents the sequence of operations of isolator circuit breaker and earthing switch while closing a circuit :

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