Which component is important for ensuring worker safety while using machinery?

Interlocked barrier guards play a crucial role in ensuring worker safety while using machinery. These guards are designed to prevent access to hazardous areas of a machine when it is operating. The interlocking feature ensures that the machine cannot be started or operated unless the guard is securely in place. This protects workers from accidental contact with moving parts, reducing the risk of injuries. By automatically shutting down or preventing operation when the guard is removed or tampered with, interlocked barrier guards create a safe working environment.

While other options like flywheel speed monitors, access control systems, and power sources may contribute to safety in specific contexts, they do not provide the direct protection during operation that interlocked barrier guards offer. Flywheel speed monitors, for example, may help detect unsafe conditions but do not physically prevent access to danger zones. Access control systems regulate who can enter certain areas, but they do not directly shield workers from machinery hazards. Power sources are necessary for operation but do not inherently enhance safety for the user. Thus, interlocked barrier guards are a fundamental component of machine safety protocols.