For fixed equipment, how far vertically should conductors be grounded from the ground level?

The requirement for grounding fixed equipment is typically focused on ensuring that any conductive parts that could be electrically charged are at a safe distance from the ground, which is why the height specified is important. Grounding conductors at a height of 8 feet above ground level is a common standard to prevent accidental contact with energized parts and to provide a reliable connection to ground.

Grounding at this height helps to minimize the risk of electrical shock or short circuits from accidental contact with individuals or equipment that may be in the area. This is particularly crucial in environments where equipment may be frequently accessed by workers.

The other choices represent heights that are not typically specified in standards for the grounding of conductors, either being too low to effectively reduce hazard potential or unnecessarily high for general safety measures. Grounding at 8 feet balances safety requirements with practical access considerations.