NEN EN 1873 : 2014 + A1 2016

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Requirements
  5.1 Degree of total luminous transmittance ( tau[D65])
  5.2 Durability
       5.2.1 General
       5.2.2 Variation of total luminous transmittance
             tau[D65] and yellowness index YI (deltaYI)
       5.2.3 Variation of mechanical properties with ageing
  5.3 Water tightness
       5.3.1 Roof lights with upstand
       5.3.2 Roof lights without upstand
  5.4 Mechanical performances
       5.4.1 Resistance to upward loads
       5.4.2 Resistance to downward loads
       5.4.3 Impact load
  5.5 Reaction to fire
  5.6 Resistance to fire
  5.7 External fire performance
  5.8 Air permeability
       5.8.1 Roof lights with upstand
       5.8.2 Roof lights without upstand
  5.9 Thermal resistance
       5.9.1 Roof lights with upstands
       5.9.2 Roof light components
  5.10 Airborne sound insulation
6 Testing
  6.1 Light transmission
  6.2 Durability
       6.2.1 Conditions for accelerated ageing
       6.2.2 Variation of light transmittance
       6.2.3 Variation in yellowness index
       6.2.4 Variation of mechanical properties with ageing
  6.3 Watertightness
       6.3.1 Principle
       6.3.2 Procedure
       6.3.3 Apparatus
  6.4 Mechanical performances
       6.4.1 Resistance to upward and downward loads
       6.4.2 Impact load
  6.5 Number and dimensions of test specimens
  6.6 Test report
7 Evaluation of conformity
  7.1 General
  7.2 Initial type testing
  7.3 Factory production control (FPC)
       7.3.1 General
       7.3.2 Equipment
       7.3.3 Raw materials and components
       7.3.4 Design process
       7.3.5 Product testing and evaluation
8 Designation
9 Marking
Annex A (informative) Guidelines for safety, application, use
                      and maintenance
  A.1 General
  A.2 Guidelines for safety
  A.3 Guidelines for application and use
  A.4 Maintenance
Annex B (normative) Alternative test method for the
                    determination of light transmission
  B.1 General
  B.2 Apparatus
  B.3 Test pieces
  B.4 Procedure
  B.5 Expression of results
Annex C (informative) Information regarding luminous
                      transmittance
  C.1 General
  C.2 Material characteristics
  C.3 Transmission
  C.4 Reflectance factor
  C.5 Absorptance
  C.6 Solar gain
       C.6.1 General information
       C.6.2 Illuminance
       C.6.3 Solar factor
Annex ZA (informative) Clauses of this European Standard
                       addressing the provisions of the EU
                       Construction Products Directive
  ZA.1 Scope and relevant characteristics
  ZA.2 Procedure(s) for attestation of conformity of roof lights
       ZA.2.1 Systems of attestation of conformity
       ZA.2.2 EC Certificate and Declaration of conformity
  ZA.3 CE marking and labelling
Bibliography

Defines requirements for rooflights made of plastic materials (e.g. GF-UP, PC, PMMA, PVC) and rooflights with upstands made of e.g. GF-UP, PVC, steel, aluminium or wood for installation in roofs.