Which statement correctly describes a ring final circuit?

• A. It forms a loop back to the distribution board with two parallel paths
• B. It runs from the consumer unit to each outlet individually
• C. It uses a PEN conductor throughout
• D. It is only used for data cabling

Answer: (A)

A ring final circuit is designed as a closed loop that starts and finishes at the distribution board, with two live conductors running around the ring to form two parallel paths to the outlets. This dual-path arrangement means the same outlet can be fed from either side of the ring, helping to balance load and reduce voltage drop along the circuit. In practice, the ring also carries neutral and earth conductors to complete the circuit and provide fault protection. The idea of a loop back with two parallel paths captures how a ring final circuit supplies outlets from two directions, increasing capacity on a single circuit.

The other descriptions describe different arrangements or usages. A radial circuit goes from the consumer unit to each outlet without looping back. A PEN conductor is a combined protective earth and neutral conductor used in some supply arrangements, not typical for a standard ring final circuit. Data cabling is for data networks, not for power outlets.