濟南電纜橋架內線纜別鋪滿！這不是省錢是埋隱患

　　Don't cover all the cables in the Jinan cable tray! This is not about saving money, it's about burying hidden dangers

　　做電氣敷設工程時，不少施工人員會有個誤區：覺得把電纜橋架塞滿線纜更省事，能省出額外的橋架材料和施工成本。但內行人都清楚，橋架內線纜不能鋪滿，這看似省錢的操作，實則是在埋下嚴重的隱患。今天就從原理和規范要求兩方面，把這個問題講透，幫大家避開施工誤區。

　　When doing electrical installation engineering, many construction workers have a misconception: they think that filling cable trays with cables is more convenient and can save additional tray materials and construction costs. But insiders are aware that the cables in the bridge must not be fully laid. This seemingly cost-effective operation is actually burying serious safety hazards. Today, we will explain this issue from two aspects: safety principles and regulatory requirements, to help everyone avoid construction misunderstandings.

　　橋架內線纜不能鋪滿，核心原因就在于**散熱**。電纜在通電工作時，無論功率大小都會產生熱量，這是無法避免的物理現象。而熱量的散發效果，直接和線纜的敷設密度掛鉤：如果橋架內線纜鋪得太滿、擠得太嚴實，線纜之間幾乎沒有空隙，產生的熱量就很難散發出去，會在橋架內不斷積聚。

　　The core reason why the cables inside the bridge cannot be fully laid is due to * * heat dissipation safety * *. When cables are powered on, they generate heat regardless of the power level, which is an unavoidable physical phenomenon. The heat dissipation effect is directly linked to the laying density of cables: if the cables in the cable tray are laid too full or squeezed too tightly, and there are almost no gaps between the cables, the heat generated is difficult to dissipate and will continue to accumulate inside the cable tray.

　　這種熱量積聚帶來的危害，遠比想象中嚴重。，過高的溫度會導致電纜的載流量下降——簡單說，就是電纜能承載的電流會變小。如果此時用電負荷沒有減少，就可能出現“過載但未跳閘”的危險情況：用電負荷的電流已經超過了電纜在高溫下的實際載流量，但還沒達到斷路器的過載長延時電流閾值，這時候斷路器不會提前動作切斷電源，而電纜卻會因為持續過載發熱，絕緣層逐漸老化、熔化，終導致電纜燒斷。更可怕的是，這種故障還可能引發短路、電火花，進而引燃周邊可燃物，誘發火災，造成不可估量的損失。

　　The harm caused by this heat accumulation is far more serious than imagined. Firstly, excessive temperature can cause a decrease in the current carrying capacity of the cable - in simple terms, the current that the cable can safely carry will decrease. If the electrical load does not decrease at this time, there may be a dangerous situation of "overload but not tripping": the current of the electrical load has exceeded the actual current carrying capacity of the cable at high temperature, but has not yet reached the overload long delay current threshold of the circuit breaker. At this time, the circuit breaker will not act prematurely to cut off the power supply, but the cable will continue to heat up due to continuous overload, and the insulation layer will gradually age and melt, ultimately leading to cable burnout. What's even more terrifying is that this kind of malfunction may also cause short circuits, electric sparks, and ignite surrounding combustibles, triggering fires and causing incalculable losses.

　　為了從源頭規避這種風險，相關規范對橋架內線纜的敷設密度有明確要求：**橋架內所有線纜的截面積之和，不能超過橋架截面積的40%**。這個40%的比例，就是為了給線纜散熱預留出足夠的空間，讓電纜工作時產生的熱量能順利散發，保證電纜始終在溫度范圍內運行，避免因過熱導致的各類故障。

　　In order to avoid this risk from the source, relevant national regulations have clear requirements for the laying density of cables in the cable tray: the sum of the cross-sectional areas of all cables in the cable tray cannot exceed 40% of the cross-sectional area of the cable tray. This 40% ratio is to reserve enough space for cable heat dissipation, allowing the heat generated during cable operation to dissipate smoothly, ensuring that the cable always operates within a safe temperature range, and avoiding various faults caused by overheating.

　　除了控制截面積比例，規范還建議電纜在橋架內不要重疊布置。很多施工隊為了多放線纜，會把電纜層層疊疊堆在橋架里，這種做法會進一步阻礙散熱，即使總截面積沒超過40%，也可能因為局部散熱不暢出現問題。正確的做法是，讓線纜在橋架內均勻排布，盡量保持平行且留有間隙，確保每根電纜都能充分散熱。

　　In addition to controlling the cross-sectional area ratio, the standard also recommends that cables should not be arranged overlapping inside the cable tray. Many construction teams stack cables layer by layer in cable trays in order to accommodate more cables, which further hinders heat dissipation. Even if the total cross-sectional area does not exceed 40%, problems may still occur due to poor local heat dissipation. The correct approach is to evenly distribute the cables within the cable tray, keeping them parallel and leaving gaps as much as possible to ensure that each cable can dissipate heat sufficiently.

　　可能有人會覺得，“我之前也把橋架塞滿過，沒出什么問題”。這其實是僥幸心理在作祟，短期的正常運行不代表長期。一方面，電纜的絕緣層老化是一個漸進的過程，短期過熱可能不會立刻顯現故障，但會大幅縮短電纜的使用壽命；另一方面，若遇到夏季高溫、用電高峰期等情況，電纜的發熱量會驟增，原本“看似”的塞滿狀態，很可能瞬間突破閾值，引發故障。

　　Some people may think, 'I have filled the bridge before without any problems.'. This is actually due to a mentality of luck, and short-term normal operation does not necessarily mean long-term safety. On the one hand, the aging of the insulation layer of a cable is a gradual process, and short-term overheating may not immediately manifest as a fault, but it will significantly shorten the service life of the cable; On the other hand, if encountering high temperatures in summer, peak electricity consumption periods, or other situations, the heat generation of cables will suddenly increase. The originally "seemingly safe" state of being packed may easily break through the safety threshold in an instant, causing faults.

　　對于的電纜橋架廠家和施工團隊來說，遵循這一規范是基本要求。比如煙臺瑞鑫這類專注橋架生產的廠家，在提供產品和施工指導時，都會反復強調線纜敷設密度的要求，因為他們清楚，工程才是位的，省下來的這點材料成本，根本抵不上一次事故的損失。

　　For professional cable tray manufacturers and construction teams, following this specification is a basic requirement. For example, manufacturers such as Yantai Ruixin, who specialize in cable tray production, repeatedly emphasize the requirement for cable laying density when providing products and construction guidance, because they understand that engineering safety is the top priority, and the saved material costs cannot even offset the losses of a safety accident.

　　總結下來，電纜橋架內線纜“不鋪滿”，不是苛刻的要求，而是保障用電的底線。無論是施工人員還是工程負責人，都不能抱有僥幸心理，必須嚴格按照“線纜截面積不超過橋架截面積40%”的規范執行，同時保證線纜均勻排布、預留散熱間隙。只有這樣，才能確保電纜長期穩定運行，從根源上規避過熱、燒斷、火災等隱患。如果對具體的敷設規范還有疑問，建議對照電氣施工標準仔細核對，或咨詢的電氣工程師，讓工程既合規又。

　　In summary, the requirement of not covering all cables in the cable tray is not a strict requirement, but a bottom line to ensure electrical safety. Both construction personnel and project leaders must not have a mentality of luck, and must strictly follow the standard of "cable cross-sectional area not exceeding 40% of the bridge cross-sectional area", while ensuring that cables are evenly distributed and reserved with heat dissipation gaps. Only in this way can we ensure the long-term stable operation of the cable and avoid safety hazards such as overheating, burning, and fire from the root. If there are still doubts about the specific laying specifications, it is recommended to carefully check against the national electrical construction standards or consult a professional electrical engineer to ensure that the project is both compliant and safe.

　　本文由   濟南電纜橋架 友情奉獻.更多有關的知識請點擊  http://www.im21.com.cn/   真誠的態度.為您提供為的服務.更多有關的知識我們將會陸續向大家奉獻.敬請期待.

　　This article is a friendly contribution from Jinan Cable Bridge For more related knowledge, please click http://www.im21.com.cn/ Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.