Which of the following is an extraneous conductive part?

• A. Metallic water pipe
• B. Live conductor
• C. Insulation
• D. Plastic conduit

Answer: (A)

An extraneous conductive part is a conductive item that isn’t part of the electrical installation itself but can become electrically connected to it and potentially carry fault current or pose a shock risk. A metallic water pipe fits this well because it’s outside the electrical installation boundaries yet is usually bonded to earth or can become connected to the wiring system. If a live fault were to reach the pipe, current could flow through it, creating a danger if someone touches the pipe. In contrast, a live conductor is already part of the installation, so it isn’t extraneous. Insulation and plastic conduit are non-conductive materials, so they don’t count as extraneous conductive parts.