What distance must exposed non-current-carrying metal parts of fixed equipment be connected to an equipment grounding conductor if they are likely to become energized?

The correct answer indicates that exposed non-current-carrying metal parts of fixed equipment should be connected to an equipment grounding conductor if they are within a specified distance, which in this case is 8 feet. This requirement is rooted in safety standards that aim to ensure that any metal parts that could unintentionally become energized do not create a risk of electric shock.

The distance of 8 feet is significant because it allows for sufficient separation between electrical components and areas where grounding is necessary. In situations where these parts are located within this 8-foot range, grounding becomes critical in minimizing the risk of electric shock in the event of a fault that could energize the metal parts.

The other options propose distances that do not align with recognized safety codes, which typically stipulate a maximum distance of 8 feet for this grounding requirement. By adhering to this guideline, the safety of personnel and equipment is prioritized, ensuring that any potential electrical hazards are effectively mitigated. This is why the 8-foot criterion is the accepted standard in this situation.