Discussion
A voltage operated ELCB trips when the potential difference between the protected metal work of the installation and the general mass of earth exceeds ______.
Answer: D
A voltage-operated earth leakage circuit breaker has a coil connected between the metal work of the installation and a separate earth electrode, and it trips when the potential of the metal work above earth reaches a set value. The key gives that value as 24 V for the purpose of safety, so option (D) is the answer. The values 2 V, 6 V and 12 V are lower than the setting, and the breaker would then trip for small harmless voltages. The item is a recall question and the key is followed.
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