Domestic Circuit Analysis

We need to evaluate each statement regarding domestic circuits to determine which are true.

Statement Evaluation

• (i) All the appliances are connected in parallel. This statement is true. In domestic wiring, appliances are connected in parallel across the main voltage supply. This ensures each appliance receives the standard voltage (e.g., 220V) and can be operated independently without affecting others.
• (ii) The live wire in the domestic circuit has green insulation on it. This statement is false. The live wire typically has red or brown insulation. Green insulation is conventionally used for the earth wire, which is a safety measure.
• (iii) A fuse connected to the circuit allows excessive current to pass through the appliances. This statement is false. A fuse is a safety device designed to protect appliances. It contains a wire that melts and breaks the circuit when the current exceeds a predetermined safe limit, thereby stopping the flow of excessive current.
• (iv) The neutral wire in the domestic circuits has black insulation on it. This statement is true. The neutral wire commonly has black or blue insulation. It completes the circuit by providing a return path for the current.

Conclusion

Based on the analysis, statements (i) and (iv) are true. Therefore, the correct option includes both (i) and (iv).