Mineral insulated cable summary of laying experience
Ordinary cables are usually very flexible and easy to lay, but mineral insulated cables have metal sheath so laying up a little difficult. Let VGCABLE intorduce Mineral insulated cable summary of laying experience.
1. There are industry technical specifications for mineral insulated cable laying. Please refer to technical specifications JGJ 232-2011 for mineral insulated cable laying. Below the main share some mineral insulation cable laying construction experience.
2. The mineral insulated cable shall not be directly bent into a right Angle when placing the cable. The metal tube in the cable is easy to be deformed. For example, after annealing, the minimum bending radius of BTTZ rigid mineral insulated cable is only 2~6 times of the outer diameter of the cable. So it's a pretty easy turn. The minimum bending radius of YTTW cable is 6~15 times of the outer diameter of the cable, the minimum bending radius of BTLY cable is 12~15 times of the outer diameter of the cable, and the minimum bending radius of BBTRZ cable is 12~15 times of the outer diameter of the cable. The specific understanding of bending radius is shown in the figure below:
Minimum bending radius of BTTZ mineral insulated cable
3. When laying the cable, a certain inflection point needs to be repeatedly bent, and the metal tube of the bending part needs to be heated with a blowtorch, so that the metal tube of the cable will not be broken so easily, except that the BBTRZ cable has no metal tube.
4, mineral insulation cable laying as far as possible in the construction of sunny days, rainy days cable joints easy to be affected by moisture, affecting the fire performance to play a role, if the construction environment is a little damp can use the torch baking terminal joint, and measure the cable insulation resistance to reach 100 Megabyte before installation and use.
5. If the ordinary cable and the mineral insulated cable are in a bridge, they should be left and right, with a baffle in the middle, because the mineral insulated cable can normally work at 250°C, because its surrounding is calorific.
6, put BTTZ mineral insulated cable to calculate the length of each section in advance, and the location of the intermediate joint, because it has the limit of the longest production meters, the location of the intermediate joint should be reasonably set for the convenience of cable maintenance and inspection in the future.
Mineral insulated cable summary of laying experience
In addition, BTTZ cable can be directly buried or laid in plain application, while other types of mineral insulated cable can be laid in closed bridge or through pipe. More about the mineral insulation cable laying cable knowledge please pay attention to wintek electric, do not reprint.