What type of machine guard is used when a worker needs to access the guarded area?

The correct answer is interlock guard. An interlock guard is designed to provide both safety and accessibility. It allows access to a guarded area while ensuring that the machine cannot operate when the guard is open or removed. This mechanism prevents accidental injuries that could occur if the machine were to operate while the worker is in the guarded area. Interlock guards are often used in situations where regular access is needed for maintenance or operation but must be carefully managed to protect workers from hazards.

In contrast, fixed guards are stationary barriers that provide a permanent separation between the worker and the machine. They do not allow for access without removal, making them impractical when frequent access to the guarded area is necessary. Removable guards can be taken off for access but may not provide the same level of protection or safety assurance, as they rely on the user to replace them correctly. Adjustable guards can be modified in position and are useful for covering different machine parts but are not specifically designed for situations where access is frequently required.