• What are the requirements for fire protection for cable holes?

    What are the requirements for fire protection for cable holes?

    19-01-2019

    Answer: For larger cable through holes, such as cables running through the floor, etc., when using fireproof blocking materials, according to the actual situation, first apply four to six layers of fireproof coating on the cable surface, the length is about 1.5m below the hole, and then The refractory material is processed into a fireproof blocking material with a certain strength, which ensures t...

  • How to carry out moisture treatment before construction

    How to carry out moisture treatment before construction

    12-01-2019

    Making yellow wax ribbons, black glass paint strips, alkali-free glass ribbons for cable joints, etc. How to carry out moisture treatment before construction? Answer: (1) Constant temperature drying method: roll the insulating tape into a small roll with a diameter of 25~30mm, put it in a constant temperature drying oven at 110~120 °C for 4~5h, cool it out and put it into a dry sealed cylinder. (2...

  • What are the rules for cable protection?

    What are the rules for cable protection?

    05-01-2019

    Answer: (1) When the cable needs to be laid with protective tube, the inner diameter of the pipe should not be less than 1.5 times the outer diameter of the cable. The inner diameter of concrete pipe, clay pipe, asbestos and cement pipe should not be less than 100mm; (2) The bending radius of the cable tube shall comply with the requirements for the bending radius of the cable to be penetrated; (3...

  • Cable insulation and sheath material performance test

    Cable insulation and sheath material performance test

    29-12-2018

    Including thermal weight loss, thermal shock, high temperature pressure, low temperature bending, low temperature stretching, low temperature impact, flame retardant properties and so on. These are the properties of plastic materials for insulation and sheathing. For example, the thermal weight loss test is to detect the degree of degradation and volatilization of materials after high temperature ...

  • Cable selection

    Cable selection

    25-12-2018

    Commonly used power cables include oil-immersed cables, PVC insulated cables, and cross-linked polyethylene cables. They are extended to different types of special cables depending on the application. Now, with the continuous improvement of production skills and production processes, XLPE cables have become the most widely used cable products. When selecting cables, they should be selected accordi...

  • Cable mechanical performance testing

    Cable mechanical performance testing

    18-12-2018

    Mainly to test the tensile strength and elongation at break of insulating and sheathed plastic materials, including before and after aging, as well as flexural test, bending test, load breaking core test, insulated core tear test for finished soft cable, Static bending test, etc. Tensile strength before and after aging, and elongation at break before and after aging are the most important and most...

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