Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p10
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 10/43)
Character Range: 172101–174594

and N other than M1, the centre of the rectangle shall be inside a circle having a radius of 10 cm centred on the projection of point 0;
2.3.2.3. For agricultural and forestry tractors and for construction-site vehicles, the position of the visibility zone shall be indicated in the test report.
2.3.2.4. The height of the above rectangle may be reduced to 15 cm for windscreens which are less than 44 cm high.
                     2.3.3. Zone FIII:  Intermediate zone, not more than 5 cm wide, between zones FI and FII.
2.4. Test method
 The method used shall be that described in Annex 3, paragraph 1.
2.5. Points of impact (see Annex 17, Figure 2)
2.5.1. The points of impact shall be selected as follows:
                       Point 1: in the central part of zone FII in an area of high or low stress,
                       Point 2: in zone FIII, as near as possible to the vertical plane of symmetry of zone FII,
                       Points 3 and 3': 3 cm from the edges of one median of the test piece; when there is a tong mark, one of the breakage points shall be near the edge bearing the tong mark and the other near the opposite edge,
                       Point 4: at the place where the radius of curvature is smallest on the longest median,
                       Point 5: 3 cm from the edge of the test piece at the place where the radius of curvature of the edge is smallest, either to the left or to the right.
2.5.2. A fragmentation test shall be performed at each of the points 1, 2, 3, 3', 4 and 5.
2.6. Interpretation of results
2.6.1. A test shall be deemed to have given a satisfactory result if fragmentation satisfies all the conditions given in paragraphs 2.6.1.1., 2.6.1.2. and 2.6.1.3. below.
2.6.1.1. Zone FI:
2.6.1.1.1. The number of fragments in any 5 cm x 5 cm square is not less than 40 nor more than 350; however in the case of a count of less than 40, if the number of fragments in any 10 cm x 10 cm square containing the 5 cm x 5 cm square is not less than 160, this shall be acceptable.
2.6.1.1.2. For the purposes of the above rule, a fragment extending across a side of a square shall count as half a fragment.
2.6.1.1.3. Fragmentation shall not be checked in a strip 2 cm wide round the edge of the samples, this strip representing the frame of the glass, nor within a radius of 7.5 cm from the point of impact.
2.6.1.1.4. A maximum of 3 fragments of an area exceeding 3 cm2 shall be allowed. No two of these fragments shall be contained within the