Section 1 General Provisions Article 6.1.1 Before laying the cable (wire), it shall be checked for appearance and conduction, and the insulation resistance shall be measured with a DC 500 volt megger. The resistance value shall not be less than 5 megohms; when there are special regulations, it shall be complied with Provisions. Installation of the second bracket Article 6.2.1 The material shall be corrected and straightened when making the bracket. There should be no curling or burrs at the cut. The prepared bracket should be firm, straight, and accurate in size. Installation of the third section of the sink Article 6.3.1 The prepared wire trough shall be flat, the interior shall be smooth and burr-free, and the processing dimensions shall be accurate. everyone enjoys luck , https://www.eeluck.com
Article 6.1.2 shall be laid in the shortest way, horizontally and vertically, neatly and beautifully, and shall not be crossed.
The line of 6.1.3 shall not be laid in areas susceptible to mechanical damage, discharge from corrosive media, moisture, and interference from strong magnetic fields and strong electrostatic fields. When it is unavoidable, protection or shielding measures should be taken.
The line of 6.1.4 shall not be laid in a location that affects operations and hinders equipment maintenance, transportation and pedestrians.
Article 6.1.5 When the ambient temperature around the line exceeds 65 °C, heat insulation measures shall be taken; when there is a fire source place that may cause fire, fire prevention measures shall be added.
The line of 6.1.6 shall not be laid in parallel under the high-temperature process equipment, the pipeline and the process equipment and pipeline with corrosive liquid medium.
The distance between the line of the 6.1.7 line and the adiabatic process equipment and the surface of the pipeline insulation shall be greater than 200 mm, and the distance between the line and other process equipment and the surface of the pipeline shall be greater than 150 mm.
Article 6.1.8 When laying overhead lines from the outdoors, there shall be waterproof measures.
Appropriate margins shall be left at the terminal wiring of the line of Article 6.1.9 and through the expansion joints and settlement joints of the building.
Article 6.1.10 shall have no intermediate joints. When it is unavoidable, it shall be wired in the junction box or junction box. The joints shall be crimped; when welding is used, non-corrosive flux shall be applied. The compensation wire should be crimped. Coaxial cables and high-frequency cables should use special connectors.
When laying out the line in Article 6.1.11, it is not advisable to install holes in the concrete beams and columns, and the anti-corrosion layer should not be damaged in the anti-corrosion workshop.
After the line is laid in Section 6.1.12, the school group and label shall be carried out, and the insulation resistance shall be measured in accordance with the provisions of Article 6.1.1 of this code.
When measuring the insulation resistance of the line in 6.1.13, the connected instrumentation and components must be disconnected.
Article 6.1.14 shall be marked at the terminal of the line and at the underground manhole; the line buried underground shall be marked on the ground directly above it; the signs and pillars shall be strong, obvious and corrosion-proof. The writing on it should be clear and not easy to fall off.
Article 6.2.2 When installing the bracket, the following provisions shall be complied with.
1. On the metal structure and the embedded parts of the concrete structure, it shall be fixed by welding.
Second, on the concrete, it should be fixed by expansion bolts.
3. On process pipes that do not allow welding brackets, they should be fixed with “U†bolts or clips.
4. On the metal processing equipment and pipelines that allow welding brackets, welding can be used. When the process equipment, pipe and bracket are not the same material or need to increase the strength, a reinforcing plate with the same material as the process equipment and pipe should be welded in advance, and then the bracket is welded on it.
5. The bracket should be fixed firmly, horizontally and vertically, neat and beautiful. The spacing of the brackets on the same straight section should be uniform.
6. When the bracket is installed in a cable trench with a slope or a building frame, the installation slope should be the same as the slope of the cable trench or the building frame; when installed on a curved device or frame, the installation arc should be the same as the device. Or the arc of the frame is the same.
Article 6.2.3 shall not be installed in a position with large vibration, heat source, corrosive liquid droplets and sewage channel; nor should it be installed in process equipment with high temperature, high pressure, corrosive and flammable and explosive medium. Pipes and structures that can be moved.
The distance between the metal troughs for horizontal installation and the metal support for protection tubes in Section 6.2.4 shall be 2 m. The interphase shall be appropriately reduced at the corners, terminals and other required positions; the space may be appropriately increased during vertical installation. .
The distance between the cable supports of Article 6.2.5 shall be: 0.8 m when the cable is laid horizontally and 1.0 m when it is laid vertically.
Article 6.3.2 The wireway groove shall be firm when welded, and shall not be significantly deformed.
When the 6.54 wire trunking is bolted or fixed, it is advisable to use a smooth half-turn bolt. The nut should be on the outside of the wireway and the fixing should be firm.
The installation of the 6.3.4 wire trough shall be horizontal and vertical, neatly arranged, and there shall be space for easy operation between the upper part and the ceiling (or floor). When the vertically arranged wire trough turns, the bending curvature should be the same.
The joint between the groove and the groove of the 6.3.5, between the groove and the instrument panel (box), between the groove and the cover, and between the cover and the cover shall be tightly sealed.
When the 6.88 wire trunking is installed on the process pipe rack, it should be on the side or above of the process pipe.
Note: For high temperature pipes, it should not be above it.
Article 6.3.7 When the cable trough turns into a right angle bend, the minimum bending radius shall not be less than 10 times the outer diameter of the thickest cable in the phase.
Article 6.3.8 When the cable is directly led out from the sink, apply mechanical processing to open the hole and use a suitable retainer to protect the cable.
Article 6.3.5 The Huicheng trough shall have drainage holes.
When the length of the straight line slot of the 6.3.10 is more than 50 meters, thermal expansion compensation measures should be taken.