Which statement best describes bonding?

• A. It isolates all exposed parts.
• B. It bonds live parts to neutral.
• C. It adds protective insulation.
• D. It connects extraneous conductive parts to each other and to the main earthing terminal.

Answer: (D)

Bonding is about making conductive parts that could be touched share the same electrical potential by linking them together and connecting them to the main earthing terminal. This creates a low-impedance path to earth so that, if a fault occurs, any fault current doesn’t cause dangerous voltage differences between exposed or extraneous metal parts. By keeping these parts at the same potential, the risk of electric shock is greatly reduced.

That’s why the description of bonding as connecting extraneous conductive parts to each other and to the main earthing terminal is the best fit. The other options describe isolation, insulation, or an incorrect connection between live parts and neutral—none of which achieve the protective, equipotential purpose of bonding.