Problems needing attention in heating cable construction

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Problems needing attention in heating cable construction
1. Before construction, you must understand the structure, performance and installation requirements of the heating cable used.
2. Installation, commissioning and operation of the heating cable must comply with GB50254-96 “Code for Construction and Acceptance of Electrical Installations for Explosive and Fire Hazardous Environments” and GB50257—96 “Code for Construction and Acceptance of Low Voltage Electrical Apparatus”.
3, all kinds of heating cable installation have minimum bending radius requirements, if excessive bending will damage the heating cable.
4. The heating cable laid along the pipeline in parallel is generally installed below the pipeline and is 45 with the horizontal axis of the pipeline cross section. Angle, if you use 2 heating cables, it should be laid symmetrically.
5. When installing on the container, the heating cable should be wrapped around the lower part of the container, usually not more than 2/3 of the height of the container, generally l/3.
6. For electric heat tracing of non-metallic pipes, a metal piece (aluminum foil) should be sandwiched between the outer wall of the pipe and the heating cable to improve the heat tracing effect.
7. Installation of the heating cable should fully consider the possibility of pipe fittings and equipment disassembly to ensure that the heating cable itself is not damaged.
8. When installing the accessories, the aprons, washers and fasteners are required to be installed correctly and tightly to prevent loosening or water in the box.
9. The insulation material outside the heating cable must be dry and the quality and thickness of the material must be guaranteed.
10. In humid and corrosive environments, reinforced or marine heating cables must be used.
11. After the insulation material is installed, the waterproof layer must be wrapped immediately to prevent rain and moisture.
12. When installing the cable, the tail box must be used. It is forbidden to short-circuit the core wire connection at the end.
13. The maximum laying length of the heating cable should be less than 50 meters.
14. When laying parallel pipes in parallel, ensure that the heating cable is close to the bottom of the pipe, so that it can transfer heat more effectively and reduce heat loss during work.
15. At the same time, it should be noted that the antifreeze sensor should be installed in the upper part of the pipeline (ie, the opposite direction of the heating cable); the antifreeze sensor should not be directly in contact with the heating cable, so the actual temperature of the pipeline cannot be accurately detected.
16. When using other laying methods, also pay attention to the installation position of the antifreeze sensor, and put it at the lowest point of the pipe temperature.
17. During the construction process, it is necessary to pay attention to the surface of the heating cable without scratches, cracks, etc., and replace it once it is found.
18, in addition to the installation of smart meters can control the heating cable work, the use of tropical antifreeze alone, the power input must be installed with leakage protection device, can not directly use the ordinary three-terminal plug. The grounding protection wire should be reliably connected to the pipe laying the heating cable. In this way, once there is leakage in the heating cable, the leakage protection device can reliably cut off the power supply to ensure safety.

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