When assessing machinery and equipment for possible non-mechanical hazards, consider how machinery and equipment can affect the area (environment) around them. People must be provided with safe access that is suitable for the work they perform in, on and around machinery and equipment.
Interlock guarding occurs when the act of moving the guard (opening, sliding or removing) to allow access, stops the action of the hazardous mechanism. Interlock guarding works by: • disconnecting the drive mechanism mechanically (e.g. applying a brake or disengaging a clutch or geared mechanism) • isolating the power source of the drive mechanism (e.g. stopping the motor) • a combination of mechanical and power disconnection.
High integrity/fail-safe control. All safety control systems should be designed and built to prevent failure or, in the event of failure, de-activate the operation of the machinery and equipment. The extent to which a safety control system should tolerate faults is a function of risk (likelihood and consequence), and is described fully in AS4024.1501 Safety Related Parts of Control Systems, which explains the categories of control required as a function of increasing risk.
There are legal requirements that must be observed prior to allowing people to enter a confined space. • Training in confined space entry. • Issue of entry permits. • Continuous monitoring and supervision.