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BS 4662-2006 pdf free download
BS 4662-2006 pdf free download.Boxes for flush mounting of electrical accessories Requirements and test methods and dimensions.
The apparatus shall be set up as shown in FIgure 16. The test apparatus shall be such that a force of (1.95 ± 0.05) N has to be applied to the face of the hammer to maintain the pendulum in a horizontal position. The test apparatus shall be fixed to a solid wall of, for example, brick, stone or concrete by means of the mounting brackets.
The specimen support shall be placed so that the point of impact lies in the vertical plane containing the suspension axis of the pendulum. It shall be possible for the specimen either to be turned about an axis perpendicular to the support, or to be turned about a vertical axis or to be moved both horizontally and vertically.
The specimen shall be placed so that the point of impact lies in the vertical plane containing the suspension axis of the pendulum.
For all tests the hammer shall fall from a height of 150 mm measured vertically between the point of impact on the specimen and the face of the hammer at the point of release.
Ten blows shall be applied to points evenly distributed over the specimen. The blows shall not he applie(t within 5 mm of any knockout. The box shall be deemed to have passed the test if the requirements of 10.1 are met.
15.4.2 Performance of screw threads
Screws of non-metallic material and metal screws threaded into a non-metallic material shall be tightened and loosened being completely removed and reinserted 10 times. In all other cases screws shall be tightened and loosened five times.
The test shall be carried out using a screwdriver that matches the size and shape of the head of the screw. The applied torque shall be as specified by the manufacturer. If no values of applied torque are specified by the manufacturer the torque values specified in Table 2 shall be applied.
The screws shall be fully tightened without being forced.
The screws shall be examined for visible signs of damage with normal or corrected V)SOI without magnification. There shall be no damage to the screw threads which impairs their further use.BS 4662-2006 pdf free download.
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