Which of the following three terminals used in domestic wiring?

Explanation:

Domestic Wiring Terminals

Definition: In domestic electrical wiring, it is essential to connect various terminals correctly to ensure safe and efficient power distribution. The primary terminals used in domestic wiring are Line (Live), Neutral, and Earthing (Ground). These three terminals work together to form a complete electrical circuit, ensuring that electricity is safely delivered and any faults are grounded to prevent hazards.

Correct Option Analysis:

The correct option is:

Option 3: Line, neutral and earthing

This option accurately identifies the three terminals used in domestic wiring. The Line terminal carries the current from the power source to the load, the Neutral terminal completes the circuit by carrying the current back to the power source, and the Earthing terminal provides a safe path for fault currents, protecting both the equipment and individuals from electrical shocks.

Additional Information

To further understand the analysis, let’s evaluate the other options:

Option 1: Line, neutral and phase

This option is incorrect because it mentions "phase" instead of "earthing." In electrical terminology, "phase" typically refers to the Line (Live) terminal in a single-phase system. Therefore, mentioning both Line and phase is redundant, and it misses out on the critical Earthing terminal.

Option 2: Line, phase and ground

This option is also incorrect as it repeats the mistake of referring to both Line and phase, which are essentially the same in a single-phase system. It does include ground (earthing), but the redundancy and missing Neutral terminal make it an incorrect choice.

Option 4: Phase, ground and earthing

This option is incorrect because it mentions both ground and earthing, which are the same. It also misses out on the Neutral terminal, which is essential for completing the circuit in domestic wiring.

Conclusion:

Understanding the correct terminology and the roles of various terminals in domestic wiring is crucial for ensuring safe and efficient electrical installations. The correct terminals - Line, Neutral, and Earthing - work together to form a complete and safe electrical circuit. Line carries the current to the load, Neutral completes the circuit by returning the current, and Earthing provides a path for fault currents to prevent electrical hazards. Correctly identifying and connecting these terminals is fundamental in domestic wiring practices.