Electrical conduit testing instrument KGN-3 type conduit heat resistance test device

1Preface to the heat resistance test device for casing

This testing machine is suitable for conducting heat resistance tests on various plastic pipes and plastic corrugated pipes, determining the required heat resistance value of the pipes, and thus determining their heat resistance strength. It meets the requirements of GB/T14823.2 "Special Requirements for Electrical Installation Conduits - Rigid Insulated Material Flat Conduits", JG3050 "Insulated Electrical conduit and accessories for Buildings", and ZBG33008 "Polyvinyl chloride Plastic Corrugated Wire Conduit".

IITechnical parameters of heat resistance test device for casing:

Dimensions: 19.5cm × 10cm × 24cm

Host weight: 5.26KG

1 # Weight: 0.965KG

2 # Weight: 1.921KG

Total weight: 2.886KG

IIIMeasurement method for heat resistance test device of casing

1. Take three 80mm long hard sleeves and accessories, cut them into two pieces along the axis of the sleeve, and take one piece from each as a sample. Accessories can be made from the accessories depending on the specific situation. Place the sample and JG3050 "Insulated Electrical Sleeves and Accessories for Buildings" ball pressure heat resistance tester together in an oven at a temperature of 60 ℃± 2 ℃. Place the sample on the flat plate of the ball pressure heat resistance tester, and place a steel ball cone with a diameter of 5 mm at the lower end on the sample. Hold it under a pressure of 20 N (for the sleeve, it should be pressed on its concave surface) for 1 hour. After reaching the specified time, take out the sample, cool it at room temperature, and measure the indentation diameter d with a vernier caliper. The value should not be greater than 2mm.

2. Take three 100mm long samples of semi-rigid and corrugated sleeves, and place them together with the heat-resistant testing device for semi-rigid and corrugated sleeves in an oven. The temperature control inside the oven is as follows:

-5 type, -15 type, -25 type sleeves, with an oven temperature of 60 ℃± 2 ℃; 90 type and 90/-25 type sleeves, with an oven temperature of 90 '℃± 2 ℃.

Table 7 Heat resistance test load

3. The sample and the semi-rigid and corrugated sleeve heat resistance test device are kept in the oven for 4 hours, and then the sample is placed on the semi-rigid and corrugated sleeve heat resistance test device. A steel rod with a diameter of 6 mm is placed on the sample, and the axis of the steel rod is orthogonal to the axis of the sleeve. The sample is subjected to the specified load in Table 7 through the steel rod.

4. After being loaded, the sample is kept for 24 hours, and then cooled to room temperature while maintaining the load. The load is removed, and the sample is immediately erected. The corresponding gauge is selected, and it is required that the gauge can slide freely from the sleeve under its own weight.

5. Heat resistance test load