Why is it important to de-energize electrical circuits before working on them?

De-energizing electrical circuits before working on them is a critical safety measure primarily to prevent electrical shock or arc flashes. When a circuit is energized, there is a risk of current flowing through the body if contact is made, which can lead to severe injury or even fatality. Additionally, electrical arcs can occur when there is a discharge of electricity across a gap, which can result in burns, blast injuries, and other hazards. By ensuring that the circuit is de-energized, workers can significantly minimize these risks and protect themselves when performing maintenance or repairs.

This safety practice is fundamental to electrical work, ensuring that the environment is safe before personnel approach or manipulate any components. Using proper lockout/tagout procedures alongside de-energization further enhances safety by preventing accidental re-energization while maintenance is taking place.