between 3 and 5 ohms. In no case should the grounding resistance be higher than 25 ohms Grounding Systems (Section 9-1.6.2) Inspect ground reels for corrosion. SM SM SM Ensure ground reels are securely mounted to a rigid base. Inspect clamps for serviceability. Replace clamp if jaws are deformed for corroded, spring is weak, or other Quarterly defects are evident that would prevent a good connection. Inspect cable wires. Replace if more than one-third of the cable wires are broken. The connections to the grounding SM SM SM system must be surveyed and verified for continuity. If a Static Grounding connection is suspected to be Systems loose, perform further testing. In Annually some occasions it is more cost effective to replace the suspected connection instead of performing diagnostic tests. Resistance measurement on static SM SM SM grounds: Measure static ground resistance of new and damaged ground rods. Static ground with a When observed resistance greater than 10,000 to be physically damaged. ohms will be removed or replaced. Static ground mechanically damaged will be repaired and retested. Electric Motors (Section 9-1.7) Lubricating motor bearings and Quarterly SM SM SM Electric inspect for vibration and Motors overheating.
between 3 and 5 ohms. In no case should the grounding resistance be higher than 25 ohms Grounding Systems (Section 9-1.6.2) Static Grounding Systems Inspect ground reels for corrosion. Ensure ground reels are securely mounted to a rigid base. Inspect clamps for serviceability. Replace clamp if jaws are deformed for corroded, spring is weak, or other defects are evident that would prevent a good connection. Inspect cable wires. Replace if more than one-third of the cable wires are broken. Quarterly SM SM SM The connections to the grounding system must be surveyed and verified for continuity. If a connection is suspected to be loose, perform further testing. In some occasions it is more cost effective to replace the suspected connection instead of performing diagnostic tests. Annually SM SM SM Resistance measurement on static grounds: Measure static ground resistance of new and damaged ground rods. Static ground with a resistance greater than 10,000 ohms will be removed or replaced. Static ground mechanically damaged will be repaired and retested. When observed to be physically damaged. SM SM SM Electric Motors (Section 9-1.7) Electric Motors Lubricating motor bearings and inspect for vibration and overheating. Quarterly SM SM SM
ufc_3_460_03_appendix_c.docx