If the use of multiple grounding connections results in objectionable current and the requirements of 250.4(A)(5) or (B)(4) are met, it shall be permitted to _____.

• A. Discontinue one or more but not all of such grounding connections
• B. Interrupt the continuity of the conductor or conductive path causing the objectionable current
• C. Change the locations of the grounding connections
• D. Ignore the objectionable current and leave the connections as is

Answer: (A)

When there are multiple grounding connections to the same equipment or system, different grounding paths can carry current between them, causing objectionable or circulating currents. The NEC allows you to reduce this problem by discontinuing one or more of those grounding connections, as long as the requirements of 250.4(A)(5) or (B)(4) are met. The idea is to preserve at least one solid grounding path while eliminating redundant paths that create unwanted current flow. Interrupting the actual grounding path or relocating the connections doesn’t address the issue in the same way and can compromise safety, and ignoring the objectionable current isn’t allowed because the grounding system is there to protect people and equipment. So the permitted action is to discontinue one or more, but not all, of the grounding connections while maintaining a proper grounding path.