This European Standard specifies a method for determining the fire resistance of curtain walling systems. This standard should be read in conjunction with EN 1363-1. The test method is applicable to curtain walls designed for the purpose of providing fire resistance. The test is not appropriate for testing curtain walls which incorporate non-fire resistant glazing. This test method evaluates the performance of a complete assembly for classification purposes, tested with a heated area of 3 m x 3 m. The fire resistance of curtain walls can be determined under internal or external exposure conditions. In the latter case the external fire exposure curve given in EN 1363-2 is used. Tests on individual parts of a curtain wall (e.g. linear gap seal, panel or glazing) are performed using part 4 of this European Standard.