Series of Posts on Preventing Common Problems in Instrument Installation (VII)
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Series of Posts on Preventing Common Problems in Instrument Installation (VII): We invite fellow enthusiasts to actively participate in the discussions on these issues. Constructive suggestions will be rewarded generously; having relevant images will earn additional points as a bonus. By sharing such problems and their solutions, we can avoid similar issues arising in future installations and create a favorable environment for maintenance work. Thank you! Common problems in conduit installation: 7. Excessively large spacing between conduits and pressure guide pipe supports, with some areas lacking support. The cover of the wire threading box is loosely connected; the cover does not return to its original position after wires are threaded through, or the screws are missing. l Analysis and prevention: Construction shall be carried out strictly in accordance with the technical instructions; the skill levels of technicians should be improved, employee quality education should be strengthened, and good construction habits should be developed.
1 There are too many bends in the wire guide tube; more than 2 of them make it difficult to pass the wires through. 2 The wire duct is fixed by direct spot welding, rather than using U-shaped clamps, which prevents damage to the anti-corrosion coating of the galvanized pipe. 3 The wire conduit does not emerge from the side of the cable tray, but rather from the bottom. 4 The wire conduit is not installed properly, which prevents the explosion-proof hose from being connected to the instrument connector
Threaded fitting for wire conduits is also a matter that requires expertise; at least five threads are needed. The threading machine should be lubricated with oil, and the appropriate thread inserts must be selected. For sizes of DN15 and DN20 and above, the burrs on the inner side of the threaded fittings must be removed to prevent damage to the cables during installation. Sometimes, to save trouble, one connector is used to pass two wires through it, which makes subsequent maintenance very inconvenient. Additionally, during installation, the U-shaped clamps are tightened by hand, and it’s common for them not to stay in place in higher locations. Many people, while working, *inhabitually stand on the conduit rack to carry out their tasks. There are also many, many assignments and precautions that violate the rules; let’s discuss them together.
Is there any standard for point 3? Don’t just talk nonsense – if holes are made at the bottom of the cable tray, water will flow into the junction box
Bro, please take another look at the question and my reply; you might be misunderstanding it