Which of the following lists two common safety features of domestic electrical systems?

• A. Fuses only
• B. Earthing; Fuses or circuit breakers
• C. Insulation with grounding
• D. Surge protectors

Answer: (B)

Two important safety measures in homes are earthing and rapid interruption of current. Earthing provides a low-resistance path to the earth so any exposed metal parts stay at a safe, near-zero voltage, making shocks unlikely even if a fault occurs. Protective devices like fuses or circuit breakers automatically disconnect the supply when current is too high or a fault happens, preventing overheating and fires. Together, earthing and a protective device form the standard two-feature safety package in domestic systems. Surge protectors guard against voltage spikes and are useful, but they aren’t the primary two-feature safety setup. Insulation helps reduce the chance of contact, but by itself it doesn’t guarantee the current will be cut off during a fault, so it isn’t described here as the two main safety features.