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Cable laying of flame-retardant bridges shall comply with regulations

  • Categories:Zhongrui News
  • Author:
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  • Time of issue:2019-05-28 14:06
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(Summary description)(1) Main control project 1. Metal cable brackets and cable duct flame retardant bridges must be grounded (PE) or connected to zero (PEN) reliably. 2. Cable laying is strictly prohibited by twisting, squashing, cracking of the protective layer and severe scratching of the surface.

Cable laying of flame-retardant bridges shall comply with regulations

(Summary description)(1) Main control project

1. Metal cable brackets and cable duct flame retardant bridges must be grounded (PE) or connected to zero (PEN) reliably.

2. Cable laying is strictly prohibited by twisting, squashing, cracking of the protective layer and severe scratching of the surface.

  • Categories:Zhongrui News
  • Author:
  • Origin:
  • Time of issue:2019-05-28 14:06
  • Views:
Information
(1) Main control project
 
1. Metal cable brackets and cable duct flame retardant bridges must be grounded (PE) or connected to zero (PEN) reliably.
 
2. Cable laying is strictly prohibited by twisting, squashing, cracking of the protective layer and severe scratching of the surface.
 
(2) General items
 
1. Cable bracket installation should meet the following requirements:
 
(1) When the design is not required, the distance between the top of the vertical shaft of the cable bracket or the floor is not less than 150-200mm; the distance from the lowermost layer of the flame-retardant bridge bracket to the bottom of the trench or the ground is not less than 50-100mm;
 
(2) When the design is not required, the minimum allowable distance between the layers of the cable support is in accordance with the provisions of the table;
 
(3) When the bracket and the embedded part are welded and fixed, the weld is full; when fixing with the expansion bolt, the bolt is used for fitting, the connection is firm, and the anti-loose parts are complete.
 
2. When the cable is laid on the bracket, the minimum allowable bending radius at the corner shall comply with the requirements of the table.
 
3. Cable laying and fixing should meet the following requirements:
 
(1) Vertically laid or flame-retardant bridges with a slope of more than 45o are fixed on each bracket;
 
(2) The clamp or bracket for fixing the single-core cable or the phase-separated cable for each phase does not form a closed ferromagnetic circuit;
 
(3) The cables are arranged neatly and with less crossover; when the design is not required, the spacing of the cable support points is not greater than the provisions of the table;
 
(4) When the design is not required, the minimum clearance between the cable and the pipeline meets the requirements of the following table and is laid under the flammable and explosive gas pipeline and the heat pipeline;
 
(5) Cable trenches and shafts for cable laying of flame-retardant bridges, according to the design requirements, fire barriers.
 
4. The first end, end and branch of the cable shall be provided with a card.

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