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UL 719 Abrasion resistance tester of jacket on flat cable
7.14 Abrasion resistance test of jacket on flat cable
7.14.1 Six straight untwisted 15 inch or 380 mm specimens are to be cut from a sample length of finished cable. They are to be laid flat and parallel to one another on a flat horizontal steel plate and are to be individually secured in place at their ends. An abrasion tool consisting of a weighted solid steel right-circular cylinder across one face of which three straight parallel teeth are machined symmetrically about a diameter (see Figure 3) is to be supported above (not touching) the center of each specimen with its teeth perpendicular to the longitudinal axis of the specimen. The support is to minimize the play of the tool at the ends of each stroke during the abrasion process.
7.14.2 The plate on which the specimens are mounted is to be made to reciprocate horizontally in simple harmonic motion at 30 cycles per minute in the direction parallel to the longitudinal axes of the specimens.
The stroke is to center on the abrasion tools, and the length of stroke is to be the 6 inches or 150 mm occupying the center portion of the specimens.
7.14.3 The test is to be started with the plate on which the specimens are mounted at rest at either end of the stroke and the stroke counter set at zero and for the beginning of a cycle. Weight is to be added to the top of each of the abrasion tools to make the combination of each tool and its added weight exert downward 3 lbf ±0.5 ozf or 13.34 ±0.14 N or 1.36 ±0.01 kgf. The abrasion tools are to be lowered gently onto the specimens and the plate is to be started reciprocating immediately. The action is to be continued without interruption until one or more of the tools wear through the outer covering on the cable or until 70 full cycles have been completed without any tool wearing through. An operator is to be present throughout the test to observe the wear, brush away accumulations of debris during the test that might influence the abrading action of the tools in subsequent tests, and to notice and record the number of strokes at which the jacket on each specimen wears through if it wears through.
