Captive key systems do not provide full isolation of the power source, but may provide limited temporary access under controlled conditions.
They are assembled from a standardized type of components. These consist of mechanical elements that control the movement in various ways, such as, gear trains, transistor switches, belt or chain drives, linkages, cam and follower systems, brakes and clutches, and structural components such as frame members and fasteners.
Separation is a simple and effective machinery and equipment risk control and may be achieved by distance, barrier or time. • Distance separation means a person cannot reach the hazard due to distance. • Barrier separation means an effective barrier or guard denies access and controls ejection of parts, products or waste. • Time separation means at the time of access, the machinery and/or equipment is disabled.
When using fall-arrest systems, specialist assistance may be necessary to select appropriate equipment, provide effective training in use and inspection, and develop an emergency retrieval plan to recover a person suspended in a fall-arrest harness. People suspended by a fall-arrest harness for short periods of time may suffer serious health effects, or may have incurred injury during the fall prior to the fall-arrest device deploying.