Resistance to short-circuit electric arcs Visible light transmission > 50% and < 75%* Protection against electric arcs up to 4 kA Protection against electric arcs up to 7 kA Visible light transmission ≥ 75% Resistance to short-circuit electric arcs EN 170 — Ultraviolet protection filters In the standards for special product requirements, the standard EN 170 sets out levels of protection and transmission requirements for ultraviolet protection filters. Excessive exposure to ultraviolet light can cause the lens of the eye to lose its transparency, which may cause visual impairment or loss of vision. Visor lenses in accordance with EN 170 therefore meet performance requirements to protect the eye from ultraviolet radiation during hazardous work. GS-ET 29 When working on energised electrical systems and equipment, the risk of a short circuit electric arc must be assessed. Short circuit electric arcs are usually caused by a short circuit between the electrical lines. The GS-ET 29 test principle is an additional requirement for the testing and certification of electrician face protection. These visors are a category 3 product, which means there is a risk of physical injury and death. With regards to different intensities of short circuit electric arcs, the certified products must be assessed for their suitability for the respective application. Here, there are distinctions between two classes, Class 1—up to 4 kA—and Class 2, up to 7 kA. EN 1731 — Mesh face protection The European standard EN 1731 describes all requirements for personal eye and face protection made of mesh material. EN 1731 visors consist of frames and lenses. Technical information on the frame and the lens are specified according to EN 1731 in the following order: • Identification of the manufacturer • Number of European standard • Symbol for mechanical strength Certification according to GS-ET 29 Mechanical strength none without mechanical strength (filters only) S increased strength (filters only) F low energy impact (45m/s) B medium energy impact (120m/s) A high energy impact (190m/s) T tested at extreme temperatures (-5°C and +55°C) Previously According to 7 kA short circuit electric arc Labelling and norms *It is obligatory to use an additional illumination, to reach a minimum illuminance of 30 lux behind the faceshield. IEC 60417-6353 (2016-02) Protection against the thermal effect of the electric arc 8 1 0 8 2 1 147
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