What is the maximum resistance reading, in ohms, when checking locally fabricated temporary grounding/bonding cable for continuity?

• A. 1 ohm
• B. 10 ohms
• C. 50 ohms
• D. 100 ohms

Answer: (B)

Ensuring a solid bonding path requires a low-resistance continuity check. For a locally fabricated temporary grounding/bonding cable, you measure the resistance to verify there are no breaks and that the path remains conductive under field conditions. The goal is to have a very small resistance, with ten ohms as the maximum acceptable reading. This allowance accounts for contact resistance at clamps, connectors, and the length of the cable itself, which can add a little resistance even when the path is intact. If the reading exceeds ten ohms, the bond is unreliable and the cable should be repaired or replaced before use. Values much lower than ten ohms, such as around one ohm, are possible; reading much higher than ten ohms indicates a serious problem as fifty or one hundred ohms would not meet safety requirements.