As a commercial complex with multiple business formats, malls need to ensure power supply for various scenarios such as lighting, air
conditioning, elevators, commercial equipment, and fire emergency systems:
Wide load range: From 32A low-power (store lighting) to 800A high-power (floor-level power);
High reliability requirements: Power outages directly affect operations and safety (e.g., escalator shutdowns, cash register interruptions, fire protection failures);
High management complexity: Requires zoned control and rapid fault isolation to reduce operation and maintenance costs.
Equipment Matrix: Hierarchical Power Distribution + Emergency Guarantee
The project is equipped with 5 types of power distribution equipment + 1 set of single-phase ATS emergency systems, covering the entire process
from "main incoming line → regional distribution → branch control → emergency backup":
End Branch Control: 4P-32A Distribution Box
Functional Positioning: Store-level low-power distribution (e.g., clothing area lighting, small display cabinets).
4-pole (4P) design: Adaptable to three-phase four-wire systems, protecting phase lines and neutral lines simultaneously to avoid leakage hazards;
32A rated current: Precisely matches low-power loads, with automatic tripping for overload/short circuit to protect equipment.
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Regional Centralized Management: 40A-10 Branch Distribution Box
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Functional Positioning: Floor public areas (e.g., corridor lighting, small shop clusters).
- 10 independent branches: Can divide sub-circuits such as "lighting, sockets, advertising lights"; in case of faults, only one branch is disconnected without affecting other areas;
- 40A load capacity: Meets the demand for parallel operation of multiple devices (e.g., multiple freezers + lighting in catering areas).
- Medium Load Distribution: 125A Distribution Box
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Functional Positioning: Floor-level power hub (e.g., ventilation systems, medium-sized air conditioning units).
- High load capacity + stable power distribution: Copper busbars reduce energy loss, ensuring continuous operation of floor-level power systems (e.g., exhaust fans, escalators);
- Enhanced protection: In addition to overload/short circuit protection, some models support over/under-voltage protection to adapt to complex mall power grids.
- Large Equipment Power Supply: 200A-7 Branch Distribution Box
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Functional Positioning: Main equipment clusters (e.g., central air conditioning hosts, large escalator groups).
- 7 high-power branches: Each branch can carry large equipment (e.g., 380V air conditioning units with single-branch current up to 30-50A);
- Flexible expansion: Reserved wiring positions support future equipment additions (e.g., new commercial electric ovens).
- Core of Emergency Guarantee: Single-Phase ATS Cabinet
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Functional Positioning: Uninterrupted power supply for critical single-phase loads such as fire protection, monitoring, and cash registers (e.g., emergency lighting, POS machines, cameras).
- Automatic switching: When the main power supply fails or is abnormal, switches to backup power (e.g., diesel generators) within ≤0.2 seconds to ensure key systems remain operational;
- Single-phase adaptation: Optimized for 220V single-phase loads, avoiding resource waste of three-phase ATS;
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- Intelligent monitoring: Some models are equipped with display screens to real-time monitor main/backup power status and automatically alarm for faults.
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System Design: Hierarchical Protection + Emergency Redundancy
Power Distribution Logic:
800A Main Box → 200A/125A Regional Boxes → 40A-10 Branch/4P-32A End Boxes
↓ (Emergency Backup)
Single-Phase ATS Cabinet (Protecting Critical Loads)
Advantage: Faults are isolated level by level (e.g., end branch short circuits only trip the branch switch without affecting the entire floor), making operation and maintenance more efficient.
Safety Design: Triple Protection
- Equipment-level: Circuit breakers in each distribution box provide overload and short-circuit protection;
- System-level: ATS cabinets achieve main/backup power redundancy to avoid long-term power outages;
- Physical-level: IP30 protection rating (dust and splash proof), with standardized internal wiring (color-coded phase/neutral lines, secure terminals to prevent sparking).
Project Value: From "Power Supply" to "Intelligent Guarantee"
- Avoid power outage losses (e.g., escalator shutdowns causing customer complaints, cash register interruptions affecting transactions);
- Zoned control reduces energy consumption (e.g., turning off some branches during non-business hours).
- 24/7 operation of fire protection/monitoring systems (guaranteed by ATS cabinets), complying with commercial building fire codes;
- Automatic tripping for overload/short circuits reduces the risk of electrical fires.
- Efficient Operation and Maintenance:
- Independent branch control enables fault location within ≤5 minutes;
- Visual status of ATS cabinets reduces manual inspection costs.
This project precisely meets the mall's power demand for "multiple loads, high reliability, and easy management" through the combination of "hierarchical power distribution + emergency redundancy"equipment, building a complete power system from "basic power supply" to "intelligent guarantee" for commercial operations.
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