Why is it important to de-energize a line before maintenance?

De-energizing a line before maintenance is crucial primarily to eliminate the risk of electric shock to workers. Working on live electrical lines poses significant hazards, such as the potential for severe injuries or fatal accidents due to electrical contact. By de-energizing the line, workers can safely handle the equipment and perform their tasks without the constant threat of electrical discharge. This step is a fundamental safety procedure in the electrical industry and is part of standard lockout/tagout practices to ensure a safe working environment.

The other options, while related to electrical work, do not directly address the most critical reason for de-energizing lines. Increasing power flow, keeping equipment stable, or reducing power costs are not relevant to the immediate safety concerns that technicians face when working on or near electrical systems. Prioritizing worker safety through de-energization is essential in preventing accidents and ensuring a safe maintenance process.