Principles, Standards and Implementation

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Protective Measures and Complementary Equipment

Introduction Preventing Access Detection Devices Safety Switches Guard Locking Switches
Non-Contact Interlock Switches Hinge Switches Position (Limit Switch) Interlocks Trapped Key Interlocks Operator Interface Devices
Logic Devices Integrated Safety Controllers Safety Networks Output Devices Connection Systems
Introduction

When the risk assessment shows that a machine or process carries a risk of injury, the hazard must be eliminated or contained. The manner in which this is achieved will depend on the nature of the machine and the hazard. Protective measures in conjunction with guarding either prevent access to a hazard or prevent dangerous motion at a hazard when access is available. Typical examples of protective measures are interlocked guards, light curtains, safety mats, two-hand controls and enabling switches.

Emergency stop devices and systems are associated with safety related control systems but they are not direct protective systems, they should only be regarded as complementary protective measures.