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In modern power systems, whether in factories, commercial buildings, or renewable energy projects, cable distribution boxes (also known as distribution boxes or cable boxes) are the key hubs for organizing, protecting, and distributing cables. Choosing an unsuitable cable distribution box can lead to power outages, safety hazards, or project delays.
This article will guide you on how to choose a cable distribution box. key steps, covering definitions, types, and practical selection criteria, to help you choose the right distribution box for your specific project needs.
A cable splitter box is a closed device used to manage, splice, and protect cables in power distribution systems. Unlike basic junction boxes (mainly used to connect cable ends), the core function of distribution boxes is to distribute power to multiple branches while preventing dust, moisture, and external factors from damaging internal components.
The cable box of Keli adopts a robust casing and optimized internal layout to ensure efficient cable management and long-term reliability, which is crucial for both low-voltage (LV) and medium-voltage (MV) applications.
The cable splitter box has three core functions:
Distribution function: Distribute the main cable to multiple branch circuits (such as powering different floors of a commercial building);
Protection function: Isolate dust, rain, corrosion and physical impact, reduce the risk of short circuit;
Maintenance function: It is convenient for maintenance personnel to access internal components for inspection, repair, or upgrade – the split box designed by Chuanli has a hinged door or removable panel, which improves operational convenience.
Characteristics: Compact size, lightweight casing (mostly made of plastic or thin metal), protection level IP20-IP4O (dustproof, not waterproof), suitable for dry, stable temperature environment;
Chuanli products: CL-IND series indoor cable distribution box – provides 12-24 port configuration, flame retardant ABS shell, suitable for office buildings, data centers and residential areas.
Features: Heavy-duty shell, protection level IP54-IP64 (waterproof and dustproof), corrosion-resistant materials (galvanized steel or reinforced plastic), can withstand extreme temperatures (-40 ℃ to 60 ℃) and harsh weather;
Chuanli products: CL-OUT series outdoor cable box – equipped with rubber sealing ring to achieve sealing protection, suitable for road lighting, photovoltaic power plants and factory areas.
Feature: The fusion of junction box (cable connection) and distribution box (power distribution) functions, suitable for scenarios that require both cable termination and branch distribution;
Chuanli products: CL-JUN series wiring splitter box – supports 6-18 cable connections, with clear identification grooves for circuit identification, widely used in industrial control systems.
| Casing type | advantage | Inferiority | River Power Application Scenarios |
| Metal (galvanized steel/aluminum alloy) | High durability, fireproof, anti-electromagnetic interference (EMI) | Heavy weight, high cost, and prone to corrosion (when unprocessed) | CL-MET series branch box, suitable for factories and substations |
| Plastic (ABS/polycarbonate) | Lightweight, corrosion-resistant, low cost | It has poor impact resistance and is not suitable for high-temperature environments. | CL-PLA series cable distribution box, suitable for indoor low-risk scenarios |
Voltage level: Ensure that the cable distribution box matches the system voltage (e.g., low voltage 220V/ 380V, medium voltage 10kV/ 35kV). Chuanli provides low-voltage branch boxes (CL-LV series) for commercial/civil projects, and medium-voltage branch box (CL-MV series) for industrial/power projects;
Current capacity: The distribution box needs to withstand the maximum current of the circuit (e.g., 63A, 125A, 250A). Keli splitter box adopts high conductive copper strip to avoid overheating problem.
Indoor vs Outdoor: Indoor box for dry areas; Choose an outdoor box for exposure to the environment. For coastal areas, it is recommended to use the series of corrosion-resistant outdoor fittings, equipped with marine-grade coatings;
Temperature and humidity conditions: High-temperature environments (such as factories) prefer metal shell boxes; A waterproof plastic box with drainage holes should be used in humid environments (such as basements).
Size selection: Determine the size according to the number of cables/branches (e.g., 12 ports for small offices, 48 ports for factories);
Internal layout: Choose a modular design splitter box, which is convenient for flexible wiring and future expansion;
Accessibility: Prioritize models with easy access, clear signage, and ample interior space – essential for minimizing downtime.
IP protection level: Choose the appropriate ingress protection (IP) level according to the environment (e.g., choose IP54 for dusty outdoor environments and IP67 for waterproof requirements);
Additional protection: Pay attention to overcurrent protection, short-circuit protection, flame retardant shell and other functions. Chuanli splitter boxes can be equipped with circuit breakers and surge protectors, enhancing safety performance.
Global standards: Distribution boxes must comply with local and international standards (e.g., IEC 62272 for low-voltage/medium-voltage equipment, UL 508 for North America, GB 7251 for China);
All Chuanli’s cable distribution boxes have passed CE, UL, and CCC certifications, and are suitable for global project needs.
Aplicación: Power distribution in factories, manufacturing plants, and heavy machinery;
Chuanli solution: CL-IND-MET series metal distribution box – high current capacity, dust-proof and waterproof, suitable for harsh industrial environments.
Purpose: Power supply for office buildings, shopping malls, hotels (such as lighting, air conditioning, socket distribution);
Chuanli solution: CL-COM-PLA series plastic cable box – compact in size, easy to install, cost-effective, suitable for indoor commercial scenarios.
Aplicación: Photovoltaic power plants, wind farms, grid distribution (e.g., connecting solar panels to the main power grid);
Chuanli solution: CL-REN series cable distribution box – weather-resistant, compatible with AC and DC systems, optimized for renewable energy applications.
How to choose a caja de distribución de cable needs to comprehensively consider voltage, environment, safety and compliance – each factor directly affects project efficiency and safety. Keli’s diversified cable distribution box, junction box and cable box products are specially designed for the unique needs of industrial, commercial and renewable energy projects, taking into account durability, safety and ease of use.
If you need to choose the right distribution box for your project, please feel free to contact our technical team for customized advice, or visit our official website to browse the full range of product details. Whether it is a low-voltage indoor distribution box, a high-voltage outdoor protective box, or a special box for new energy scenarios, Chuanli can provide solutions that meet project standards and become a reliable partner in your power distribution system.
Q1: How to select a cable distribution box
A1: You can follow the following steps:
Q2: What factors affect the choice of distribution box
A2: The core influencing factors include: voltage and current capacity (must match system parameters to avoid overload), installation environment (indoor/outdoor determines protection level, temperature and humidity affect material selection), space and layout requirements (dimensions must adaptation the installation location, Modular design is convenient for maintenance and expansion), safety requirements (IP grade, flammability, short-circuit protection, etc.), compliance certification (must comply with the standards of the project location), in addition, the cost budget and the convenience of later maintenance also need to be considered.
Q3: What is the difference between a junction box and a distribution box
A3: The core function of a junction box is to connect or terminate the cable end, only to achieve the “connection” of the cable, and does not have the ability to distribute power. The distribution box, also known as the cable distribution box, adds the function of “power branch distribution” on this basis, which can distribute the main cable current to multiple branches, suitable for multi-power supply scenarios. The junction distribution box (junction distribution box) integrates the advantages of both, which can not only realize the connection of cables but also complete the distribution of branches, and is suitable for complex circuit requirements.
Q4:How often should distribution boxes be inspected
A4: Different scenarios have different inspection cycles: the distribution box of indoor commercial scenarios (such as office buildings and shopping malls) is recommended to be inspected every 6-12 months; Outdoor or industrial scenarios (such as factories, photovoltaic power plants) should be checked every 3-6 months because the environment is more complex. In harsh environments (such as coastal areas with high corrosion, high temperature and high dust), it should be shortened to once every 1-2 months. Chu Li recommended that during the inspection, attention should be paid to whether the wiring is loose, whether the shell is damaged, whether there is water accumulation or corrosion marks inside, and ensure the long-term stable operation of the distribution box.
