R 408.41728 Grounding and bonding.

Rule 1728. (1) A grounding circuit shall be continuous, be capable of carrying the current imposed on it, and have a resistance low enough to permit sufficient current to flow to cause the fuse or circuit breaker to interrupt the current. (2) Non-electrical equipment. The metal parts of the following non-electrical equipment shall be grounded: (a) Frames and tracks of electrically operated cranes. (b) Frames of non-electrically driven elevator cars to which electric conductors are attached. (c) Hand-operated metal shifting ropes or cables of electric elevators. (d) Metal partitions, grill work, and similar metal enclosures around equipment of over 1 kV between conductors. (3) Driven rod electrodes, either singly or connected, shall have a resistance to ground of not more than 25 ohms. (4) Conductors used for bonding shall be capable of carrying the imposed current. The bonding clamps shall have a secure and positive metal-to-metal contact. Editor's Note: An obvious error in R 408.41728 was corrected at the request of the promulgating agency, pursuant to Section 56 of 1969 PA 306, as amended by 2000 PA 262, MCL 24.256. The rule containing the error was published in Michigan Register, 2013 MR 1. The memorandum requesting the correction was published in Michigan Register, 2013 MR 12.