The installation of terminal blocks within control cabinets should meet the following requirements:

1. Condition of Terminal Blocks: Terminal blocks should be undamaged, securely fixed, and well-insulated.

2. Identification: Terminals should be numbered, and the terminal block should be easy to replace and facilitate wiring.

3. Insulation and Marking: For circuits with voltages exceeding 400V, the terminal block should have adequate insulation and be marked with a red indicator.

4. Separation of Circuits: High and low voltage terminals should be arranged separately with clear markings and separated by empty terminals or reinforced insulating partitions.

5. Separation of Power Supply Terminals: Positive and negative power supply terminals, as well as frequently energized positive power supply terminals and closing or tripping circuits, should be separated by at least one empty terminal.

6. Test Terminals: Current circuits should pass through test terminals. Other circuits requiring disconnection should use special or test terminals. Test terminals must ensure good contact.

7. Moisture-Resistant Terminals: Moisture-resistant terminals should be used in humid environments.

8. Matching Terminals with Wire Cross-Section: Terminals should match the wire cross-section; do not use small terminals with large cross-section wires.

9. Material of Connectors: All connectors should be made of copper, and insulating parts should be made of self-extinguishing flame-retardant materials.

10. Labeling: Each electrical component and terminal block should be clearly labeled with numbers, names, purposes, and operational positions. The labeling should be clear, neat, and durable.

Wiring Requirements within Control Cabinets

1. Construction According to Drawings: Wiring should be performed according to the drawings, ensuring correctness.

2. Secure Connections: Connections between wires and electrical components should use bolts, plugs, or crimping, ensuring secure and reliable connections.

3. No Joints in Wires: Wires within the control cabinet should have no joints, and wire cores should be undamaged.

4. Labeling of Wires: Both the cable cores and the ends of the connected wires should be labeled with their circuit numbers, ensuring correctness, clarity, and durability.

5. Neat Wiring: Wiring should be neat, clear, aesthetically pleasing, and well-insulated without damage.

6. Terminal Connections: Each side of a terminal should ideally have only one wire, with no more than two wires. For plug-in terminals, two wires of different cross-sections should not be connected to the same terminal. For bolt-connected terminals with two wires, a flat washer should be added between them.

7. Grounding: Circuit grounding should have dedicated bolts.

8. Wire Specifications: Power circuit wiring should use copper core insulated wires rated for at least 500V. The wire cross-section should be at least 0.5mm², meeting current capacity, voltage drop, and mechanical strength requirements.

9. Flexible Wiring for Moving Parts: Wires connected to movable parts like potentiometers and control panels should be multi-strand flexible wires, with adequate length for movement. The wire bundle should have an outer plastic tube or other insulating layers, with securely tightened wire ends and added terminal accessories or tinning to prevent loosening or wire breakage. Fixed points should be secured with clips.

Cable Entry into Control Cabinets

1. Cable Arrangement: Cables entering the control cabinet should be neatly arranged, clearly numbered, and securely fixed to avoid mechanical stress on the connected terminals.

2. Cable Fixation and Grounding: Cables should be fixed and tightened upon entering the control cabinet, with grounding for static protection, control, and logic circuits. Shielded control cables should be grounded according to design requirements.

3. Insulation Protection: Rubber-insulated cores should be protected by insulating tubes. Cables within the control cabinet should be vertically or horizontally arranged without arbitrary bending or crossing. Spare core lengths should have adequate allowance.

4. Separation of Circuits: High and low voltage circuits should not share the same cable and should be separately bundled and arranged.

5. Connection of Mercury Contacts: In DC circuits with mercury contact devices, the positive power source should connect to the mercury contact end.

6. Oil-Resistant Wiring: Use oil-resistant insulated wires in oily environments, with protective measures for rubber or plastic insulated wires.

Post-Assembly Inspection of Control Cabinets

1. Cabinet Fixation and Grounding: The control cabinet should be securely fixed and grounded, with intact and clean paintwork.

2. Component Condition: Electrical components within the control cabinet should be complete, intact, correctly positioned, and securely fixed.

3. Wiring Condition: Wiring within the control cabinet should be accurate, reliably connected, clearly labeled, and well-insulated.

4. Door Locks: Control cabinet door locks should be reliable.

5. Cooling and Lighting: Cooling and lighting devices within the control cabinet should be complete.

6. Compliance with Standards: Installation quality should meet the current national standards and regulations.

7. Protection Features: The control cabinet should have moisture, dust, and heat resistance, and be accepted according to national standards.

8. Sealing: Proper sealing should be done after installation of wiring and conduits.

9. Operational Tests: Operational and interlocking tests should meet design requirements.

Pre-Installation Inspection of Electrical Wires and Cables

1. Specifications Compliance: Cables should meet specifications for model, length, insulation strength, heat resistance, voltage endurance, current carrying capacity, voltage drop, minimum cross-section, and mechanical performance.

2. Physical Condition: Cables should not be damaged externally.

3. Sealing Integrity: Cable seals should be intact.

Wiring and Cable Installation Inspection

1. Specification Compliance: Wiring specifications should meet requirements, with neat arrangement and no mechanical damage. Labels should be complete, accurate, and clear.

2. Cable Fixation and Bending: Cable fixation, bending radius, relevant distances, and connections of metal sheaths of single-core power cables should meet requirements.

3. Terminal and Joint Condition: Cable terminals and joints should be firmly installed with good contact.

4. Grounding: Grounding should be reliable, with grounding resistance meeting design specifications.

5. Correct Identification: Cable terminal phase colors should be correct, with intact corrosion protection on metal parts like cable brackets.

6. Cleanness: The cable interior should be free of debris, with all cover plates in place.

7. Secure Connections: Connections should be secure without the risk of accidental loosening.

8. Label Consistency: Identification should match the drawings.

9. Durable Identification: Cable identification marks should be clear and durable.

10. Jointless Cables: Cable installation should be free of joints.

11. Consistent Color Coding: Wire color coding should match the drawings.

12. Connector Use: Control wires exiting the control cabinet should use plugs and sockets.

13. Direct Connection: Power cables exiting the control cabinet should be directly connected to terminals.

Pre-Installation Inspection of Electric Motors

1. Packaging and Sealing: Packaging and sealing should be intact.

2. Specification Compliance: Specifications should match design requirements, with complete accessories and spare parts.

3. Documentation: Complete technical documentation should be available.

4. Physical Condition: External inspection should be satisfactory.

5. Performance Requirements: Motor performance should meet the working environment requirements.

6. Rotor Movement: The rotor should rotate smoothly without any frictional noise.

7. Lubrication Condition: Lubricating grease should be in normal condition, without discoloration, degradation, or hardening, and should meet motor working conditions.

8. Connection Quality: Motor leads should be well-soldered or crimped, with complete numbering and adequate electrical clearance for exposed live parts as per product standards.