BS 17353:2020 pdf download – Protective clothing — Enhanced visibility equipment for medium risk situations — Test methods and requirements 5.3 TypeB 5.3.1 General These garments or devices shall in their design use at least the minimum amount of retroreflective material according to Table 2 or Table 3. 5.3.2 Type B1 – Free hanging devices The devices shall be removable. The total area of the devices in use shall meet the requirements in Table 2. A Type B1 device shall be retroreflective from both sides. Its optical active area shall be a minimum 15 cm 2 per side. The total area shall be maximum 50 cm 2 per side. In order to achieve 360° visibility (visibility from all sides) at least two devices shall be used, these shall be used on the left and the right side of the torso. This shall be specified in the user information. The device shall be flat and its maximum thickness shall be 10 mm. The means of attachment (string, ribbon, cord, spiral, etc.) shall be a minimum 10 cm, in length between the points of attachment on the garment and that on the reflector to enable free movement of the device around its vertical axis and allow a pendulum effect. NOTE Consider additional requirements applicable for children’s products. 5.3.3 Type B2 – Equipment for limbs The minimum area of retroreflective material shall fulfil the requirements in Table 2. To ensure 360° visibility (visibility from all sides), one or more devices shall be applied to each upper and/or each lower limb. When retroreflective material is applied to a garment it shall also be positioned to achieve 360° visibility (visibility from all sides). The material shall be placed on the limbs so as to ensure a minimum width of 20 mm encircling each limb. Any gap in the lengthwise continuity of the retroreflective material shall not be greater than 50 mm, measured parallel to the direction of the material, and the total of such gaps shall not be greater than 50 mm around the limbs. Any offset not greater than the width of the material plus 5 mm is allowed. Additionally, separate retroreflective elements may form part of an applied design in conjunction with the above. The retroreflective elements shall have a minimum area of 25 cm 2 each. In the case of B2 garments covering upper and lower limbs, the retroreflective material can be...
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