Hebei ZENT Electric Company customizes complete distribution boxes

 It is necessary to comprehensively consider various aspects such as clear demand definition, compliance, technical parameters, and manufacturer selection to ensure safety, reliability, and meet the actual usage requirements. The following are the key points to note:

 I. Define Customization Requirements Clearly

1. **Purpose and Scenario**

   - Determine the usage scenarios of the distribution box (such as industrial, commercial, residential, outdoor, explosion-proof environments, etc.). Different scenarios have different requirements for protection levels (such as IP54, IP65), materials, heat dissipation, etc.

   - Clarify the functional requirements: Whether power distribution, lighting control, intelligent monitoring (such as remote control, power monitoring), leakage protection, lightning protection design, etc. are needed.

2. **Electrical Parameters**

   - Core parameters such as rated voltage, rated current, and short-circuit breaking capacity need to match the actual load (such as the total power of motors and equipment).

   - Number and distribution of circuits: Plan the number of input/output circuits and the load power of a single circuit, and reserve a 10%-20% redundant space for future expansion.

3. **Size and Installation Method**

   - Measure the spatial dimensions of the installation location, and determine the external dimensions (length, width, and height) of the distribution box, the installation method (wall-mounted, floor-standing, embedded), and the opening position (such as the direction of the cable inlet).

 II. Compliance and Standards

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1. **National Standards and Certifications**

   - Domestically, it needs to comply with standards such as the GB 7251 series (low-voltage complete switchgear) and GB/T 14048.1. Compulsory certifications such as the 3C certification (China) and CE certification (for export to the European Union) are required.

   - Additional certifications are required for special scenarios: For example, explosion-proof distribution boxes need to comply with GB 3836 (explosion-proof standard), and outdoor distribution boxes need to meet the IP protection level requirements.

2. **Electrical Safety Specifications**

   - Grounding design: Ensure reliable grounding (PE wire), which complies with the requirements of grounding systems such as TN-S and TN-C-S.

   - Insulation grade: The insulation materials of wires and components need to be heat-resistant and moisture-proof to avoid short-circuit risks.

   - Protection design: In wet/dusty environments, add sealing strips and fans for heat dissipation; in flammable and explosive environments, select explosion-proof casings and explosion-proof electrical components.

III. Selection of Materials and Processes

1. **Casing Materials**

   - **Cold-rolled steel plate**: Economical and durable, with surface spraying treatment (such as electrostatic powder spraying), suitable for dry indoor environments.

   - **Stainless steel (304/316)**: Corrosion-resistant, suitable for outdoor, wet, and acid-base environments (such as by the sea, chemical zones).

   - **Aluminum alloy**: Lightweight and has good heat dissipation, suitable for scenarios with weight requirements (such as suspended installation).

   - **Engineering plastics (ABS/PC)**: Good insulation and impact resistance, suitable for small distribution boxes or indoor low-load scenarios.

2. **Process Details**

   - Casing thickness: The thickness of a conventional low-voltage distribution box is ≥1.2mm, and for load-bearing or outdoor scenarios, it needs to be ≥2.0mm.

   - Surface treatment: The spraying is uniform and there is no peeling. For outdoor use, an anti-ultraviolet coating is required.

   - Internal structure: The layout of partitions and rails (such as TS35 rails) is reasonable, facilitating component installation and wiring.

IV. Configuration of Electrical Components

1. **Selection of Core Components**

   - **Circuit breaker/Air switch**: Select well-known brands (such as Schneider, ABB, Chint, Delixi, etc.). The rated current needs to match the circuit load, and the breaking capacity needs to meet the short-circuit current requirements.

   - **Residual current device (RCD)**: It needs to be installed in residential or scenarios where people are easily exposed. The rated residual current operating current is ≤30mA (to prevent electric shock to people).

   - **Surge protector (SPD)**: It needs to be configured in outdoor or areas prone to lightning strikes to protect the equipment from surge impacts.

   - **Indicator lights/Instruments**: Select clear and readable indicator lights (power, fault indication). When it is necessary to monitor current/voltage, install digital display instruments.

2. **Wiring Specifications**

   - Cross-sectional area of wires: Select according to the load current (for example, use 2.5mm² copper wire for a 16A circuit and 4mm² for a 32A circuit). The specifications of the neutral wire/ground wire need to comply with the standards.

   - Cable identification: Each wire needs to be labeled with the circuit number and purpose for easy future maintenance.

   - Wiring method: Separate strong and weak currents (such as isolating control signal lines from power lines) to avoid electromagnetic interference; the wires are neatly arranged and fixed with cable ties.

V. Selection and Communication with the Manufacturer

1. **Qualification Review**

   - Confirm that the manufacturer has the production qualification for low-voltage complete equipment (such as 3C certification) and ISO9001 quality system certification. Check the production scale and factory equipment (such as CNC bending machines, laser cutting equipment).

   - Require the provision of similar project cases (such as industrial distribution box, intelligent power distribution cabinet cases), and conduct on-site inspections or view actual shooting videos.

2. **Confirmation of Technical Documents**

   - Before customization, detailed drawings (electrical schematic diagrams, layout diagrams, opening diagrams) need to be provided, and communicate the details (such as component installation positions, terminal block positions) with the manufacturer's engineers.

   - Clarify the technical agreement: including materials, component brands, protection levels, test standards (such as withstand voltage test, temperature rise test).

3. **Price and Delivery Time**

   - Compare quotations from multiple suppliers and avoid low-price traps (low prices may use inferior components or simplify the process). Focus on "cost-effectiveness" rather than a single price.

   - Confirm the delivery cycle, reserve installation and commissioning time. For large projects, phased acceptance is required (such as pre-acceptance of the casing and power-on testing after component installation).

 VI. Installation and After-sales Service

1. **Installation Cooperation**

   - Require the manufacturer to provide installation instructions and wiring diagrams. For complex projects, on-site installation guidance can be requested.

   - For outdoor or large distribution boxes, the requirements for foundation construction need to be confirmed in advance (such as the size of the concrete foundation of the floor-standing distribution box).

2. **After-sales Guarantee**

   - Clarify the warranty period (usually 1-3 years) and the fault response time (such as on-site service within 24 hours), and agree on the replacement liability of vulnerable parts (such as indicator lights, terminals).

   - Keep documents such as certificates of conformity, inspection reports, and 3C certifications as the basis for later acceptance and maintenance.

VII. Other Points to Note

- **Intelligent Function Expansion**: If it is necessary to access the Internet of Things (IoT), reserve communication interfaces (such as RS485, Modbus protocol) in advance, and select intelligent circuit breakers or modules that support remote monitoring.

- **Environmental Adaptability**: In high-temperature environments, add heat dissipation fans or ventilation holes; in dusty environments, carry out dust-proof design; in vibration scenarios, reinforce component installation.

- **Documents and Contracts**: Sign a detailed contract, clarify technical parameters, delivery time, payment method (such as staged payment), liability for breach of contract, and avoid vague statements.

Through the above steps, the customized distribution box can be ensured to meet the requirements of safety, durability, and high efficiency, while reducing the later maintenance cost and failure risk. It is recommended to maintain close communication with the manufacturer, and invite electrical engineers to participate in the plan review when necessary.