Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Operating principles and typical forms of
  interlocking devices associated with guards
  4.1 Interlocking principles
  4.2 Typical forms of interlocking devices
  4.3 Technological forms of interlocking devices
5 Provisions for the design of interlocking
  devices (independent of the nature of the
  energy source)
  5.1 Actuation modes of mechanically actuated
      position detectors
  5.2 Arrangement and fastening of
      position detectors
  5.3 Arrangement and fastening of cams
  5.4 Reducing the possibility of
      common cause failures
  5.5 Guard locking device
  5.6 Delay devices
  5.7 Design to minimize defeat possibilities
  5.8 Environmental considerations
6 Additional technological requirements
  for electrical interlocking devices
  6.1 Compliance with EN 60204-1
  6.2 Interlocking devices incorporating
      mechanically actuated position switches
  6.3 Interlocking devices incorporating
      non-mechanically actuated position switches
      (proximity switches and magnetic switches)
7 Selection of an interlocking device
  7.1 General
  7.2 Conditions of use and intended use
  7.3 Risk assessment
  7.4 Stopping time and access time
  7.5 Frequency of access (frequency of opening
      the guard for access to the danger zone)
  7.6 Performance considerations
Annex A (informative) Guard-operated
         interlocking device with one single cam-operated
         position detector
Annex B (informative) Guard-operated interlocking
         device with tongue-operated switch
Annex C (informative) Direct (mechanical)
         interlocking between guard and start/stop manual
         control
Annex D (informative) Captive-key interlocking device
Annex E (informative) Trapped-key interlocking device
Annex F (informative) Plug and socket interlocking
         device [plug/socket combination]
Annex G (informative) Guard-operated interlocking
         device incorporating two cam-operated
         position detectors
Annex H (informative) Mechanical interlocking
         between a guard and a movable element
Annex J (informative) Electrical interlocking
         device incorporating magnetically actuated
         [magnetic] switches
Annex K (informative) Electrical interlocking
         device incorporating two proximity detectors
Annex L (informative) Pneumatic/hydraulic
         interlocking devices
Annex M (informative) Interlocking device with
         spring applied/power released guard locking
         device
Annex N (informative) Interlocking device with
         guard locking, with manually operated delay
         device
Annex ZA (informative) Relationship between
         this European Standard and the Essential
         Requirements of EU Directive 98/37/EC
Annex ZB (informative) Relationship between
         this European Standard and the Essential
         Requirements of EU Directive 2006/42/EC
Bibliography
National Annex NA (informative) Bibliography