1. Power Inlet (Incoming Supply)

The main power supply — usually from the main switchboard or an MCCB (Molded Case Circuit Breaker) — enters the lighting distribution box.

• This incoming power is typically single-phase (220V) or three-phase (380V) AC.

• The incomer section may include a main switch or circuit breaker to control and protect the entire lighting circuit.

 2. Bus Bar System

Inside the distribution box, a bus bar (a set of copper or aluminum bars) distributes the incoming electrical power evenly to all outgoing circuits.

• Bus bars act as a central power node, ensuring stable current flow.

• They are carefully insulated and mounted for safety and efficiency.

 3. Circuit Protection (MCBs/Fuses)

From the bus bar, power is fed to multiple Miniature Circuit Breakers (MCBs) or fuses, each protecting a specific lighting circuit.

• If an overload or short circuit occurs, the MCB automatically trips, cutting power to prevent damage or fire.

• Each MCB can control one or more lighting circuits depending on the installation design.

 4. Outgoing Circuits

The outgoing section carries the protected power from MCBs to the individual lighting points — such as lamps, LED fixtures, or switches in different rooms or zones.

• Circuits are usually labeled (e.g., Office Lights, Corridor Lights, Emergency Lights) for easy maintenance.

• This structure makes it simple to turn off or repair a specific lighting section without affecting the rest of the system.

 5. Metering & Monitoring (Optional)

Some advanced lighting distribution boxes include meters, indicators, or smart monitoring modules to track:

• Voltage, current, and power consumption

• Load balance across circuits

• Fault detection or power quality issues

This helps facility managers optimize energy usage and quickly locate any electrical faults.

 6. Enclosure & Safety Design

The distribution box enclosure (like the ABB ACM Series) is usually made of metal (steel) or high-grade ABS/PC plastic.

• Rated for 220V–380V and 63A–100A,

• Withstands -40°C to +80°C,

• Meets IEC60439-3 safety standards,

• Can be installed flush-mounted (inside walls) or surface-mounted (on walls).

 In Short

A lighting distribution box works by:

Receiving power → Distributing it via bus bars → Protecting circuits with MCBs → Sending power to lighting loads safely and efficiently.

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What Are the Key Advantages of Working with Wuxi Fenigal for Electrical Distribution Solutions?

Partnering with Wuxi Fenigal means gaining access to a global supplier with deep industry knowledge and flexible manufacturing capabilities. The company offers customized electrical distribution boxes, fast production lead times (1–7 days), and no M.O.Q. policy—ideal for startups and large-scale projects alike.

Fenigal integrates OEM/private label services, ensuring your brand stands out with high-quality ABB ACM Series distribution boxes. Its strong logistics network—FedEx, DHL, TNT, UPS, and sea freight—guarantees on-time worldwide delivery.

From film and media lighting systems to industrial control panels, Wuxi Fenigal delivers innovative and efficient power distribution solutions that meet global safety and performance standards.