Before working on an electric furnace, what should a technician do?

Before working on an electric furnace, it is crucial for a technician to prioritize safety and preparedness, making the choice "All of the above" the most comprehensive and correct answer.

Reviewing the diagram of the electric furnace is essential for understanding the system’s layout, components, and the sequence of operations. It helps the technician identify key parts and avoid any potential issues when performing maintenance or repairs.

Removing jewelry is also a safety measure. Jewelry such as rings or bracelets can conduct electricity and may pose a risk of electric shock or can get caught in moving parts while working on the equipment. Therefore, it is a critical step to ensure personal safety.

Following safety procedures is fundamental in any HVAC repair or installation task. This includes wearing appropriate personal protective equipment (PPE) and adhering to lockout/tagout protocols to ensure that the equipment is de-energized before beginning any work. Following these procedures minimizes the risk of accidents and injuries.

Together, all these actions contribute to a safe working environment and effective service on the electric furnace.