Method and device for testing fire resistance of cable trough box

The invention provides a cable trough box fire resistance testing method and device, and the method comprises the following steps: S1, laying a cable in a to-be-tested cable trough box, arranging the cable in a U shape, and arranging a temperature measurement element; s2, installing the cable trough box to be tested in a fire-resistant test furnace chamber; s3, the resistance measuring instrument measures the cable insulation resistance value of the cable; the temperature measuring instrument is used for detecting the temperature of the cable trough box and the cable; s4, operating the fire-resistant test furnace chamber, and starting to test; s5, recording the temperature of the to-be-tested cable trough box, the temperature of the cable and the insulation resistance value of the cable, judging that the cable is invalid, and ending the test; and S6, analyzing the fire resistance of the to-be-tested cable trough box by combining the temperature of the to-be-tested cable trough box, the temperature of the cabl