EN 953 : 1997 + A1 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Risk assessment
5 Principal requirements for the design and construction
  of guards
  5.1 Machine aspects
       5.1.1 General
       5.1.2 Access to danger zones
       5.1.3 Containment of ejected parts
       5.1.4 Containment of hazardous substances
       5.1.5 Noise
       5.1.6 Radiation
       5.1.7 Explosion
  5.2 Human aspects
       5.2.1 General
       5.2.2 Safety distances
       5.2.3 Control of access to the danger zone
       5.2.4 Viewing
       5.2.5 Ergonomic aspects
       5.2.6 Intended use
  5.3 Guard design aspects
       5.3.1 General
       5.3.2 Crushing or trapping points
       5.3.3 Durability
       5.3.4 Hygiene
       5.3.5 Cleaning
       5.3.6 Exclusion of contaminants
  5.4 Guard construction aspects
       5.4.1 Sharp edges etc
       5.4.2 Integrity of joints
       5.4.3 Removal only by tool
       5.4.4 Positive location of removable guards
       5.4.5 Positive closing of movable guards
       5.4.6 Self closing guards
       5.4.7 Adjustable guard
       5.4.8 Movable guards
       5.4.9 Control guards
  5.5 Selection of materials
       5.5.1 General
       5.5.2 Impact resistance
       5.5.3 Rigidity
       5.5.4 Secure fixing
       5.5.5 Reliability of moving parts
  5.6 Containment
  5.7 Resistance to corrosion
  5.8 Resistance to micro-organisms
  5.9 Non-toxicity
  5.10 Machine viewing
  5.11 Transparency
  5.12 Stroboscopic effects
  5.13 Electrostatic properties
  5.14 Thermal stability
  5.15 Flammability
  5.16 Noise and vibration reduction
  5.17 Radiation protection
6 Selection of types of guards
  6.1 General
  6.2 Combination of different guards or of guards
       with other devices
  6.3 Selection of guards according to the number
       and location of the hazards
  6.4 Selection of guards according to the nature
       and frequency FOR access required
       6.4.1 Moving transmission parts
       6.4.2 Where access is not required during use
       6.4.3 Where access is required during use
7 Additional design and construction considerations
  7.1 Climbing
  7.2 Retained fastenings
  7.3 Vibration resistance
  7.4 Warning signs
  7.5 Colour
  7.6 Aesthetics
8 Verification of the safety requirements for guards
  8.1 General
  8.2 Impact strength
  8.3 Safety distances
  8.4 Containment
  8.5 Noise
  8.6 Guard operating forces
  8.7 Visibility
9 Information for use
  9.1 General
  9.2 Guard hazards
  9.3 Installation
  9.4 Operation
  9.5 Removal of guards
  9.6 Inspection and maintenance
Annex A (normative) - Guidelines to assist in the
        selection of guards against hazards
        generated by moving parts
Annex B (normative) - Guidelines for the selection of
        guards according to the number and location
        of hazards
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

Describes general requirements for the design and construction of guards provided primarily to protect persons from mechanical hazards.