Professional Custom Lamp Holder Accessories Manufacturer

Self-ballasted electrodeless fluorescent lamp holders should have sufficient heat resistance. The insulating member of the external insulating member against electric shock of the lamp and the fixed charging member should have a sufficient heat resistance.
The ball pressure test apparatus shown in Figure 4, to verify that it is qualified.
The test shall be carried out in the heating box, the inside temperature should be 25 ° C ± 5 ° C higher than the Chapter 9 parts normal operating temperature. For the insulating member is fixed live parts should be at least 125 ° C, the other components should be 80 ° C. Surface level of the tested components superimposed with the 5 mm diameter steel ball 20 N beat on the surface of the part to be tested.
Before the test, the first test load and the support means is placed in the heating cabinet is heated for sufficient time to ensure that they reach a stable test temperature.
Subjects components to be placed in a heated box heating for 10 min before application of the test load.
Test, if the test surface is curved, it should be the Ball pressure parts support. To this end, if not a complete sample to be tested, the appropriate part to be tested can be removed therefrom.
The sample thickness at least 2.5 mm, if the sample to reach such a thickness may be more than two samples are placed together.
After 1 h, taken away from the tested components, steel balls, and test parts in a pan of cold water and soak for 10 min, cooled to near room temperature, measuring the indentation on the parts, its diameter should be no more than 2 mm.
If the curved surface so that the indentation oval, it should measure its minor axis length of the indentation diameter.
If in doubt, the indentation depth is measured and calculated using the formula diameter of the formula, P is the depth of indentation.
The porcelain lamp holders do not perform this test.