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2021-09-09
Analyze how to improve the pass rate of fire-resistant cables in fire-resistance tests.
In recent years, the usage of fire-resistant cables has been steadily increasing, primarily because users have come to recognize their superior performance. At the same time, the number of manufacturers producing these cables is also growing rapidly. However, ensuring that the quality of fire-resistant cables remains consistently reliable and stable over the long term is of utmost importance.
Typically, when companies develop fire-resistant cable products, they first produce a small trial batch, which is then submitted to relevant national testing institutions for certification. Once the testing report is obtained, mass production can begin. A few cable manufacturers, however, have taken it a step further by establishing their own in-house fire-resistance testing labs.
It’s worth noting that fire-resistance testing serves as a critical check on the manufacturing process itself. Even with identical production methods, variations in cable performance may still occur across different production runs due to factors like material consistency or environmental conditions. For manufacturers producing fire-resistant cables, achieving a 99% pass rate in fire-resistance tests might seem impressive—but this still leaves a 1% margin of potential risk. And for end-users, such a 1% risk translates directly into a 100% safety hazard.
To address these challenges and improve the overall reliability of fire-resistant cables, the following measures can be implemented: focusing on high-quality raw materials, carefully selecting appropriate conductor types, and rigorously controlling production processes at every stage.
2021-09-09
Important precautions to take during cable maintenance and testing
Cables whose surface does not reveal the fault location. For these types of faulty cables, in addition to verifying documentation and confirming the cable’s name, it is essential to use a cable identifier to distinguish them from other energized, operational cables—especially when multiple cables are present within the same cable tray. Accurately identifying the cable intended for maintenance is critical, as mistaking it for an energized cable could lead to dangerous accidents, such as accidentally disconnecting a live line.
Moreover, this step effectively prevents errors caused by incorrectly attached cable tags, which might otherwise result in misidentifying the wrong cable.
When cutting the cable, ensure robust safety measures are in place. Before proceeding with the cut, confirm that the cable being targeted is indeed the one to be disconnected—and verify that it is de-energized. Only after driving an insulated iron rod (equipped with an epoxy resin handle) into the cable core while ensuring proper grounding can work begin. The person holding the wooden handle must wear insulated gloves and stand on an insulating mat, paying close attention to maintain excellent grounding of the iron rod throughout the process.
If the cable needs to be moved during the procedure, exercise extreme caution and avoid forceful or rough handling to prevent damage to any other operational cables nearby.
Finally, after completing the repair, carefully reconfirm the phase sequence at both ends of the cable. Remove any existing phase markers first, then securely apply the correct phase-color labels to avoid confusion between old and new markings.
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