What is the minimum distance from which guards are NOT required from exposed moving parts?

The correct choice indicates that guards are not required from exposed moving parts when the minimum distance is 7 feet. This regulation is based on safety standards that aim to minimize the risk of injury from machinery operation.

The reasoning behind setting a minimum distance is to create a safety barrier, allowing individuals to work in proximity to moving parts without being at risk of accidental contact. A distance of 7 feet provides a buffer zone to ensure that workers can operate safely and effectively around moving machinery.

In practice, this distance helps to mitigate hazards associated with machinery, such as being caught in moving parts or struck by objects in motion. If workers maintain this safe distance, additional physical barriers like guards may not be necessary, as the risk of injury is significantly reduced.

When understanding these parameters, it is crucial for mine foremen and other safety personnel to ensure that all personnel are aware of and adhere to such safety distances to comply with regulations and protect worker safety.