When placing test leads on ground rod S and air terminal N during a bonding resistance test, which three bonds are NOT being tested?

The correct choice identifies bonds that are not being tested during the bonding resistance test when placing test leads on the ground rod S and air terminal N.

In a bonding resistance test, the focus is on ensuring that the electrical connections within a system are effective and safe. Such tests typically measure the resistive connections between major components involved in grounding and bonding, particularly between ground rods and air terminals.

By examining the selected bonds (B, H, P), it becomes clear that these particular connections may not contribute directly to the path of conductivity the test is measuring. This could be because they are either not involved in the connection between the specific components being tested or are part of a different grounding circuit. Therefore, those specific bonds are excluded from the assessment being conducted in this context. This is crucial in electrical safety, as understanding which paths are being evaluated helps to identify and isolate any potential issues that might arise in the system being examined.

Understanding these distinctions is vital for ensuring that electrical systems are safe, reliable, and compliant with safety standards. Thus, recognizing which bonds are evaluated and which are not helps to maintain the integrity of testing procedures and overall electrical safety practices.