BS 17353:2020 pdf download – Protective clothing — Enhanced visibility equipment for medium risk situations — Test methods and requirements
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 applied on the upper limbs only, on the lower limbs only or on both the upper and lower limbs. In the latter case, the minimum amount of Table 2 shall be used for upper limbs and also for the lower limbs.
NOTE An example of a B2 garment is shown in Annex E.
5.3.4 Type B3 – Equipment for the torso or the torso and limbs The minimum area of retroreflective material shall fulfil the requirements in Table 3. Garments and devices shall be measured flat and in their smallest configuration. Retroreflective material shall be placed on the torso so as to ensure a minimum width of 20 mm encircling the torso. Alternatively, retroreflective materials may be placed to encircle the upper arms. If a B3 garment covers limbs below the elbows or knees, then retroreflective material on the limbs is required. In this case, Type B2 requirements (see 5.3.3) for the limbs shall be fulfilled whilst the remainder of the material shall be placed on the torso. It is not necessary for a minimum 20 mm wide band to be applied on the limbs in this case. 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. NOTE Examples of Type B3 garments are reported in Annex E. Visibility from all sides shall be reached as follows:
— not less than 40 % of the minimum required amount of retroreflective material specified in Table 3 is present on both the front and the back when laid flat, and
— not less than 10 % of the minimum required amount of retroreflective material specified in Table 3 is present on both the right and left sides when laid flat on the back (respectively on the front).