Which of the following is NOT a conductive body that extends the ground connection?

The option that is not a conductive body that extends the ground connection is ungrounded branch-circuit conductors. While grounding electrodes, bonded metal conduits, and grounding wires are all intended to provide a conductive path to the ground, ungrounded branch-circuit conductors do not have this same function.

Grounding electrodes are physical components, like rods or plates, that are driven into the earth to provide an electrical connection to the ground. Bonded metal conduits create a continuous metallic path for grounding by connecting various metal components within a system to the grounding system. Grounding wires are specifically designed to provide a low-resistance path for fault current to reach the ground, ensuring safety and equipment protection.

In contrast, ungrounded branch-circuit conductors typically do not make any connection to the earth or grounding system. Their purpose is to carry voltage to devices without providing a direct path for fault currents to ground, which is why they do not serve to extend the ground connection. Understanding the different roles of these components is fundamental in grounding and bonding practices.