The Australian Standards provide information on machinery and equipment safety systems and reflect the current state of knowledge and best practice. The AS4024 Safety of Machinery series of publications provides specific information for commonly used machine types in industry, such as woodworking or metalworking machinery.
Equipment has a wider definition, which basically refers to things needed for a certain task. They act as a set of facilities used in the mechanical works or any other works. The equipment can also be said to be a set of tools used by a human being for a specific task.
The two buttons must be pushed at the same time and are located at a distance from each other that prevents simultaneous operation by one hand. The operation should be designed so that if either or both of the buttons are released, the hazardous action of the machinery and/or equipment cannot be reached, or if it can be reached, the mechanism returns to a safe state.
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.