A-A-52208
with the hardness requirements of 2.2.2 through 2.2.5, as applicable. Base the hardness on the average of three readings. Test the hardness of the jaws on the bevel, .125 inches from the cutting edges. Test the hardness of the straps, handles and bolts at any location on the surface. Test the hardness of the rubber bumper in accordance with ASTM D 2240 to determine compliance
with the hardness requirements of 2.2.8.
4.2.3 Compressibility. Test the compressibility of the rubber bumper in accordance with ASTM D 395 to determine compliance with the compression requirements of 2.2.8.
4.2.4 Drop. Drop the cutter from a height of 3 feet, plus or minus 1/16 inch, on a concrete floor with the hooks of the groping hook guide facing downward. Repeat the test three times to determine compliance with the hook guide drop requirements of
2.2.6.
4.2.5 Dielectric strength. Immerse the insulated handle of the cutter in 1 percent salt water solution, 2 to 2 1/2 inches from the jaw end edge of the hand guard projection of the handle insulation. If no hand guard protection is furnished, the handles shall be immersed not less than 4 inches on the handle grip. The metal part of the handle shall be one electrode and the salt solution shall be the other electrode, preferably as the ground terminal. The potential between the electrodes shall be raised at a rate of 3,000 volts per second until the final test voltage of
14,000 RMS volts, 60 hertz, AC potential is reached. Maintain the test voltage for a period of 1 minute. During this period,
voltage and current readings shall be observed to determine conformance to requirements of 2.2.10 (1). The test equipment shall have a capacity of not less than 1 kilovolt ampere.
4.2.6 Resistance to moisture absorption. Immerse the insulated handle in water for a period of 30 minutes, then wipe dry with a cloth and immediately test as follows. Place two metal foil electrodes on the insulated portion of the handle so their inside edges are 1 inch apart. A potential of 7,000 RMS volts peak, 60 hertz, AC potential shall be applied to the electrodes at a rate of 3,000 volts per second. Apply the test voltage for a period of
1 minute to determine compliance with 2.2.10 (2).
4.2.7 Resistance to impact. Rigidly mount the insulated handle. Swing a hardened steel cutting edge, suspended as a pendulum, to impart a blow to the handle insulation, equivalent to 5 foot pounds of energy. The cutting edge shall strike the insulation at right angles to the longitudinal axis of the handle to determine compliance with 2.2.10 (3). The cutting edge shall consist of a
90 degree wedge, 0.010 inches wide and 1 inch long.
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