General Technical Requirements for Power Cabinet

1. Operating Conditions:

1.1 Normal Operating Atmospheric Conditions:

• Environmental Temperature:
  • Indoor: -10°C to 55°C
  • Outdoor: -24°C to 55°C
• Relative Humidity: 5% to 95% (No condensation or freezing inside the cabinet)
• Atmospheric Pressure: 80-110 kPa

1.2 Storage and Transportation Conditions:

• The extreme temperature range for storage and transportation should be between -40°C and 70°C, with a relative humidity not exceeding 85%.
• For long-term storage, the environmental temperature should range from -10°C to 55°C.

1.3 Other Operational Conditions:

• The cabinet should not be exposed to explosive, corrosive, conductive, or insulating-damaging substances, nor should there be excessive mold growth.
• Mechanical vibration and impact should not exceed DL4 level or K2 level for collision.

1.4 Special Operating Conditions:

• Special operational conditions can be negotiated between the supplier and the customer and specified in the supply contract.

2. Types of Power Integrated Cabinets:

2.1 By Front Door Structure:

• Embedded Door: The cabinet’s front door is within the projection range of the cabinet’s main body.
• Outer-hanging (Covering) Door: The front door protrudes outside the cabinet’s main body dimensions.
  • Regardless of the door style, the cabinet structure in the same project should strive for uniformity.

2.2 By Frame Assembly:

• Assembled Type
• Welded Type
• Hybrid Assembled and Welded Type

2.3 By Environment:

• Indoor Type
• Outdoor Type

3. Cabinet Dimensions and Geometrical Tolerances:

3.1 External and Installation Dimensions:

• • The external and installation dimensions comply with general design standards for electrical cabinets. The front door is usually of the outer-hanging type. Specific dimensions are given in the table below. Refer to indoor and outdoor cabinet design standards for special cabinets, with dimensions confirmed through client consultation.

 Note: Meaning of dimension symbols:
H—cabinet height (excluding the height of the additional upper eyebrow plate of 60mm);
W—cabinet width (excluding the thickness of the external side panels or side doors);
D—cabinet depth (excluding the thickness of the external door);
W1—center distance of the mounting holes in the width direction;
D1—center distance of the mounting holes in the depth direction.

3.2 Dimensions and tolerances:

3.3 Dimensions and tolerances:

• Flatness Tolerance of the Cabinet’s Front Panel: No more than 1.5 mm per square meter.
• Verticality Tolerance in the Cabinet’s Height Direction: No more than 2 mm.

3.4 Cabinets’ Assembly and Front/Rear Door Lock Position Dimensions:

Note: 1. The hole size for cabinets is Φ6.5 or M6
2. The meaning of dimension symbols is as follows:
H1-H3: Position dimensions of cabinet cabinet holes;
H4: Position dimensions of cabinet door locks (based on the center of the door lock)

3.4 Dimensions for Installing 482.6mm (19-inch) Systems:

• The cabinet must provide the required space for installing standard 19-inch units such as racks, drawers, and panels.

4. Steel Profile Requirements:

4.1 Linear Dimensional Tolerances for Steel Profiles:

• Detailed dimensions for tolerances related to the steel profile structures used in the cabinet frame.

4.2 Straightness and Flatness Tolerances:

• These tolerances ensure the steel profiles’ alignment meets the required structural standards.

4.3 Steel fillet radius:

4.4 Steel Profile Modulus Holes:

• For steel profiles, any modulus hole should not exceed a tolerance of ±0.4mm within a 1-meter distance.

5. Structural and Aesthetic Requirements:

5.1 General Structural Requirements:

• The cabinet layout must be simple, rational, and ergonomic, ensuring ease of use and maintenance.
• The cabinet should have an attractive design with a coordinated color scheme, meeting operational personnel’s visual and functional needs.
• Welds in all welded components should be firm and free of cracks, voids, or any welding defects.
• All cabinet connections and door seams should be uniform in size, with no significant discrepancies within 1m.
• Fasteners and detachable parts must be secure, with anti-loosening measures in place.

5.2 Electrical and Conductive Parts:

• Copper should be used for parts that function as both connectors and conductors (except for those in protection circuits).
• Reliable adhesive connections are required to avoid any part detachment or failure.

5.3 Door and Lock Requirements:

• Cabinet doors should open and close smoothly, with a minimum angle of 120°, and be securely locked.
• Multi-point locking systems are required for additional safety.
• The lock protection grade should be at least equal to the protection level of the cabinet.

6. Surface Coating and Protection Requirements:

6.1 Surface Finish:

• All fasteners should have a corrosion-resistant coating, ensuring a clean and smooth surface without defects such as cracks or chips.
• The cabinet’s frame, side panels, and doors must have a durable and uniform protective coating.
• The coating should be free from impurities, bubbles, scratches, and other imperfections, ensuring long-term protection against weathering.

6.2 Outdoor Cabinets:

• Outdoor cabinets must have excellent sun and weather resistance to withstand exposure to harsh elements.

7. Configuration Requirements:

7.1 Fire and Safety:

• Fire-resistant partitions should be added between cabinets when required for fire protection.
• The upper part of the cabinet should have provisions for lifting.

7.2 Cable and Wiring:

• The bottom of the cabinet should provide cable entry holes with seals, and the internal wiring should be well-organized.

7.3 Thermal and Ventilation Equipment:

• Fans, air conditioners, and heaters may be added based on specific temperature and humidity control needs inside the cabinet.

8. Electromagnetic Shielding Requirements:

8.1 EMC Design:

• The cabinet structure should ensure electromagnetic compatibility (EMC) through shielding, grounding, and static discharge protection.
• Exposed conductive parts should be reliably interconnected and grounded, ensuring an electrical resistance of no more than 0.1Ω.

8.2 Shielding Materials:

• Gaps and cable entry points should be sealed with electromagnetic shielding materials (e.g., conductive rubber, conductive foam).

9. Safety Requirements:

9.1 Protection Against Electric Shock:

• All exposed conductive parts must be interconnected to ensure electrical continuity, with a dedicated protective ground.
• The resistance between exposed conductive parts and the ground should not exceed 0.1Ω.

9.2 Fire Protection:

• The cabinets should minimize damage from flame, molten materials, or hot particles in the event of a fault.
• Fire-resistant barriers and screens should be used to prevent spreading.

9.3 Mechanical Safety:

• All accessible parts should be smooth and free from sharp edges or rough surfaces to avoid injury.
• Moving parts should have safety guards to prevent harm.

9.4 Outdoor Cabinets:

• Outdoor cabinets must have reliable locking mechanisms to prevent unauthorized access.

9.5 Safety Labels and Warnings:

• Safety labels should indicate relevant electrical hazards, grounding information, and other warnings to ensure safe operation and installation.