What safety measure should be taken prior to working on gas lines?

Prior to working on gas lines, shutting off the gas supply is crucial for ensuring safety. This measure prevents the potential for gas leaks, which can lead to hazardous situations such as fires or explosions. By turning off the gas, you create a safer environment for yourself and anyone else in the vicinity. This action minimizes the risk of gas exposure or ignition while performing maintenance or repairs.

While proper ventilation, personal protective equipment like gloves and eye protection, and notifying local authorities are important safety practices in various situations, the immediate priority when working on gas lines is to eliminate the source of gas flow. This is a fundamental step before undertaking any work, as it establishes a baseline level of safety.