What is one safety rule related to the operation of machinery?

One important safety rule related to the operation of machinery is to avoid wearing loose clothing around machinery. This is crucial because loose clothing can easily become caught in moving parts, leading to serious injuries or accidents. By keeping clothing fitted and ensuring that any accessories are secured, workers can significantly reduce the risk of entanglement while operating machinery. This practice is vital for maintaining a safe working environment and protecting employees from potential hazards that come with machinery operation.

In contrast, the other options pose safety risks. Operating machinery without safety guards can increase the likelihood of accidents by removing essential protective barriers. Using both hands for controls might not apply universally and could lead to distraction or loss of control under certain conditions. Using equipment only after hours may not be safe or appropriate, as proper supervision and lighting conditions are crucial for safe operation.