AS NZS 62841.2.5:2015 pdf download.Electric motor-operated hand-held tools,transportable tools and lawn and garden machinery- Safety Part 2.5: Particular requirements for hand-held circular saws.
19 Mechanical hazards
This clause of Part 1 is applicable, except as follows:
19.1 Replacement of the first paragraph. Moving and dangerous parts other than the rotating blade shall be so positioned or enclosed to provide adequate protection against personal injury. The guarding of rotating blade is covered in 19.1.101.
19.1.101 Saws shall be so guarded as to minimise the risk of accidental access to the rotating blade. Guarding systems shall not be removable without the aid of a tool. There are four commonly used guarding systems for saws, as shown in Figures 101, 102, 103 and 104. Guarding systems can be designed with the blade on the right or on the left side of the saw. These guarding systems shall comply with the requirements of 19.101 and
19.102. Each one of these guarding system types can be designed with or without the riving knife (item 6 in the figures). — If a guarding system is designed with a riving knife, it shall meet the additional requirements of Annex AA. — If a guarding system is designed without a riving knife, it shall meet the additional requirements of Annex BB. Compliance is checked by inspection.
19.3 This subclause is not applicable. NOTE The requirements for accessibility of dangerous moving parts through dust collection openings are specified in 19.101.2.1.
19.101 Guarding above the base plate
19.101.1 For saws using a guarding system as shown in Figures 101, 102 and 103, the upper guard shall meet the requirements of 19.101.2.
19.101.2 Specific requirements
19.101.2.1 Apertures in the guarding system above the base plate, unless otherwise specified in 19.101.2.2 to 19.101.2.5, shall be designed to prevent contact with the cutting edge zone of any specified blade diameter in accordance with the marking required by 8.3. Compliance is checked with the test probe ‘a’ of Figure 105, which is inserted at any angle and to the depth possible. The test is performed with the saw set for 00 bevel angle and maximum depth of cut.
19.101.2.2 On the motor side of the upper guard, adjacent to the cutting edge zone at the front of the blade an aperture may be provided for viewing the line of the cut. This viewing aperture shall either meet the requirements of 19.101.2.1, as illustrated in Figure 106, or it shall be limited by proximity and height restrictions (see Figure 108). • Proximity restriction
Any unobstructed straight line distance between the cutting edge zone of any specified blade diameter in accordance with the marking required by 8.3 and the designated measuring points of the following grasping areas shall be at least 120 mm:
— the auxiliary handle, if provided;
— if no auxiliary handle is provided:
• the motor casing, if the motor casing is designed as grasping area;
• the switch trigger grasping surface, if the motor casing is not designed as grasping area. Compliance is checked by the following measurements, which shall be conducted with the base plate set to maximum depth of cut and 90 °.
a) To establish the measuring points on the auxiliary handle or the motor casing (as shown in Figure 107), follow the procedure outlined below.
Establish the closest (A) and the most distant (B) points on the auxiliary handle or motor casing defined grasping surface from the blade. For the motor casing, the closest (A) point to the blade is assumed to be in the plane of the main handle farthest from the blade. Equidistant between points (A) and (B), but not more than 45 mm away from point (A), draw the vertical intersecting line of the plane parallel with the blade and the surface of the auxiliary handle or motor casing, as applicable. Then establish the closest (C) and the most distant (E) point from the plane of the base plate on the auxiliary handle or motor casing defined grasping surface. Equidistant between points (C) and (E), draw the horizontal intersecting line of the plane parallel with the base plate and the surface of the auxiliary handle or motor casing, as applicable. The intersection of the vertical and horizontal lines drawn on the applicable surface is the defined measuring point.
Then measure from this defined point to the cutting edge zone.
b) For the switch grasping area: Measure the distance from the cutting edge zone to the geometric centre of the switch trigger grasping surface with the switch in the“off” position. ●Height restriction The height of the viewing aperture (H) measured from the bottom plane of the base plate, as shown in Figure 108a，is limited to the point where the line of sight, from the ordinary operator’s head position to the tip of the saw blade cutting the wood, is intersecting the outer surface of the upper guard. The maximum permissible height H, in millimetres, is given by the formula
19.101.2.3 Except as specified in 19.101.2.4, the perpendicular projection of the upper guard on to the blade shall cover at least the cutting edge zone of the smallest specified blade. The space between the upper guard and the blade diameter in accordance with the marking required by 8.3 shall be designed to prevent contact with the saw blade teeth tips of that specified blade.
Compliance is checked with the test probe ‘a’ of Figure 105, which is inserted at any angle and to the depth possible, as illustrated in Figure 106. For the test, the saw set is fitted with a 2 mm thick steel disc with the smallest specified diameter in accordance with 8.3, set for 00 bevel angle and maximum depth of cut. The test probe shall not be able to contact the edge of the steel disc.
19.101.2.4 For saws having an inclinable base plate for the purpose of bevelling, the distance ‘x’, along any line perpendicular to the plane of the base plate between:
— any plane that is parallel to the bottom of the base plate that makes contact with an upper edge of the base plate nearest to the blade,and
— the edge of the lateral side of the upper guard on the side opposite to the motor and adjacent to the front cutting edge zone of the blade, as shown in Figure 109,shall not exceed:
a) 38 mm for circular saws with a maximum blade diameter less than 265 mm;
b) 45 mm for circular saws with a maximum blade diameter equal or greater than 265 mm;
c) 55 mm for circular saws with a maximum blade diameter equal or greater than 265 mm and where the lower guard is not provided with any retracting handle and the only means for operating the lower guard is remotely from the motor side of the upper guard.AS NZS 62841.2.5 pdf download.

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