Principles, Standards and Implementation

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Prevention of Unexpected Power Up

Introduction Lockout/Tagout Safety Isolation Systems Load Disconnects Trapped Key Systems Alternative Measures to Lockout
Introduction

Prevention of unexpected power up is covered by many standards. Examples include ISO 14118, EN 1037, ISO 12100, OSHA 1910.147, ANSI Z244-1, CSA Z460-05, and AS 4024.1603. These standards have a common theme: the primary method of preventing unexpected power up is to remove the energy from the system and to lock the system in the off state. The purpose is to safely allow people to enter a machine’s danger zones.