It is designed and manufactured in accordance with the standard requirement of BS1363 Figure 8 and Cl. 12.12.
12.12 The degree of flexibility of mounting of the plug pins or the angular movement of the pins in the base shall be not greater than 3° 30´ in the directions shown in Figure 8 from an axis which is perpendicular to the plug engagement face when the pins are subjected to a force as shown in Figure 8.
12.12.1 Compliance shall be checked by inspection and in case of doubt by the following test.
NOTE Plugs may be checked using an apparatus similar to that shown in Figure 8. (Other methods of measuring the 3° 30´ deflection may be used.)
The plug is clamped in the mounting block by means of any two of the plug pins in such a manner as toensure that the face of the plug, from which the plug pins project, is supported and in contact with the corresponding flat surface of the mounting block. The back of the plug is not supported and does not come into contact with the fixture. The axis of the clamped pins is horizontal.
The unclamped pin shall be tested for declination from the horizontal by applying a force of N,
mm from the engagement face of the plug and parallel with it in the four directions shown in Figure 8. The test shall be repeated in turn on the other two pins of the plug.
During each test the declination from the horizontal measured on the scale shall not exceed 3° 30´. After all tests have been completed the plugs shall fit the gauge shown in Figure 5 when used in the manner as described in 12.2.1.