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Temperature: Ambient temperature should generally range from -5°C to +40°C, with an average daily temperature not exceeding +35°C. For high-temperature environments (e.g., steel mills, chemical plants), select models with enhanced heat dissipation; for low-temperature or cold regions, consider anti-freeze and low-temperature-resistant designs.
Humidity: Relative humidity should not exceed 50% at +40°C; at lower temperatures, higher humidity (e.g., 90% at +20°C) is allowed, but anti-condensation measures must be in place.
Altitude: Standard products are suitable for altitudes ≤ 2000m. For higher altitudes, derate insulation and heat dissipation performance.
Pollution Level: Most industrial scenarios correspond to Pollution Level 3. For harsh environments (dust, corrosion, salt spray), choose higher protection levels and corrosion-resistant materials.
Explosion-proof Requirements: In flammable and explosive areas (petrochemical, coal mines), select explosion-proof draw-out switchgear that complies with national explosion-proof standards.
IP30: Prevents entry of objects > 2.5mm; suitable for clean indoor environments (control rooms, office buildings).
IP40: Prevents entry of objects > 1.0mm; for general industrial workshops.
IP54: Dust-protected and splash-proof; for outdoor or dusty, humid environments.
IP65: Dust-tight and jet-proof; for harsh outdoor or corrosive environments.
Prevent closing the circuit breaker when the draw-out unit is not in the working position.
Prevent drawing out the unit when the circuit breaker is closed.
Prevent accidental closing of the grounding switch.
Prevent live grounding of the equipment.
Prevent entry into the charged compartment.
Interlocks must be mechanical priority, supplemented by electrical interlocks, with no failure points and easy manual operation.
Three-position function: The unit must have clear working, test, and isolated positions with reliable positioning and obvious position indicators.
Interchangeability: Units of the same type and specification must be fully interchangeable, with consistent dimensions and interfaces to facilitate quick replacement.
Mechanical strength: The draw-out mechanism must withstand repeated operations (≥ 500 times) without jamming or deformation.
Secondary connection: Use high-quality aviation plugs or multi-core connectors with reliable contact, anti-vibration, and anti-loosening features.
Material and cross-section: Main busbars and branch busbars should use high-conductivity T2 copper bars with sufficient cross-sectional area to meet current-carrying and temperature-rise requirements中国政府采购网.
Connection process: Busbar connections use silver-plated or tin-plated surfaces, tightened with high-strength bolts, and equipped with spring washers to prevent loosening.
Insulation treatment: Busbars should be covered with heat-shrinkable insulation sleeves or coated with insulating paint to enhance insulation performance and safety中国政府采购网.
Heat dissipation: Reasonable busbar arrangement and internal ventilation design to control temperature rise within standard limits (≤ 60K for copper bars).
Brand selection: Prefer well-known brands (Siemens, ABB, Schneider, Chint, Delixi) with stable quality and complete certifications.
Certification verification: All components must have 3C certification (China) or international certifications (CE, UL)无锡市政府.
Parameter matching: Component rated voltage, current, and breaking capacity must match the system design.
Redundancy design: For critical loads, consider dual-power or redundant component configurations.
Material: The cabinet should use high-quality steel plates (≥ 2mm thickness) or aluminum alloy. For corrosive environments, select galvanized, aluminized zinc-coated, or stainless steel plates.
Welding and assembly: Welds should be smooth, crack-free, and well-treated for rust prevention. The cabinet must have high rigidity, no deformation under full load or short-circuit conditions.
Surface treatment: Adopt electrostatic spraying or plastic coating with uniform color, strong adhesion, and corrosion resistance.
Primary and secondary separation: Power cables and control cables must be routed separately to avoid electromagnetic interference中国政府采购网.
Wire specifications: Secondary circuits use copper core wires (≥ 2.5mm² for current circuits, ≥ 1.5mm² for voltage circuits) with clear identification and standard color coding中国政府采购网.
Termination: Use crimped terminals with reliable crimping and no loose connections. Moving parts use flexible stranded wires with sufficient slack中国政府采购网.
Select manufacturers with professional design, production, and testing capabilities, advanced equipment, and a complete quality management system (ISO 9001).
Review project cases and user feedback to assess on-site application performance.
Prefer manufacturers with independent R&D and after-sales service teams.
Must have a complete 3C certification (for low-voltage products) and type test report issued by a national authoritative laboratory无锡市政府.
Verify the validity of certifications and consistency between the actual product and test samples.
Check for compliance with GB 3906, IEC 60420, and other relevant standards.
Size customization: Adjust cabinet dimensions (width, depth, height) to fit on-site installation space.
Unit configuration: Customize the number and type of draw-out units (feeder, motor control, capacitor compensation, metering) according to load requirements.
Inlet/outlet mode: Choose top-in top-out, bottom-in bottom-out, or side-in side-out based on cable layout.
Confirm the manufacturer’s service scope, response time, on-site maintenance capabilities, and spare parts supply cycle.
Prefer manufacturers that provide installation guidance, commissioning, training, and regular maintenance.
Draw-out units should be easy to remove and install without special tools.
Components should be easily accessible for replacement and adjustment.
Clear fault indication and diagnosis functions to speed up troubleshooting.
Assess design life (typically 20–30 years) and long-term operating costs (energy consumption, maintenance frequency).
Balance initial investment with long-term reliability; avoid choosing low-quality products solely for low prices无锡市政府.
Avoid parameter mismatches: Do not purchase products with voltage, current, or breaking capacity lower than system requirements.
Prevent counterfeit components: Verify component authenticity and avoid using uncertified or inferior parts无锡市政府.
Check interlock reliability: On-site test mechanical and electrical interlocks to ensure correct action sequence.
Confirm interchangeability: Test interchangeability of same-type units to ensure consistency.
On-site acceptance: Conduct appearance inspection, parameter verification, and functional testing before installation.
Sign complete contracts: Clarify technical parameters, configuration, delivery time, acceptance criteria, after-sales terms, and liability for breach of contract.
Reserve spare parts: Purchase common spare parts (circuit breakers, contacts, connectors) for emergency replacement.
