In a ceiling rose, which conductor becomes live only when the switch is closed, and how is it typically marked?

• A. Neutral
• B. Switched live conductor
• C. Permanent live conductor
• D. Earth

Answer: (B)

In a ceiling rose, the conductor that becomes live only when the switch is closed is the switched live conductor. This wire runs from the switch to the lamp holder and carries current only when the switch is on. It’s typically marked with a red sleeve (older codes) or a brown sleeve (newer codes) to show that, although it may be housed with other conductors, it is live only when the switch is closed. The permanent live conductor is always live and feeds the switch loop, the neutral is always the return path for the lamp, and the earth is the protective conductor. The sleeving on the switched live helps prevent misidentification and ensures safe, correct wiring when servicing or replacing parts.