Standard Size of Emergency Lighting Distribution Box

Emergency lighting distribution boxes typically range from compact 300×300×150 mm units to larger 600×600×200 mm enclosures, depending on circuit capacity and fire-resistance requirements.

Typical Dimensions

Emergency lighting distribution boxes are designed to house components such as automatic transfer switches (ATS), miniature circuit breakers (MCBs), residual current devices (RCDs), and fire alarm forced-closure modules . The physical size of the box depends on the number of circuits it supports and whether it includes additional modules for fire safety or monitoring. Common dimensions include:

• Small units: approximately 300–400 mm height × 300–400 mm width × 150–200 mm depth, suitable for 4–8 circuits.
• Medium units: approximately 500–600 mm height × 500–600 mm width × 200 mm depth, supporting 8–16 circuits.
• Large units: 600–800 mm height × 600–800 mm width × 250–300 mm depth, for 16–32 circuits or more, often used in commercial or industrial buildings.

Enclosure and Mounting Considerations

• Material: Steel or fire-resistant composite, sometimes rated for 850°C/120 minutes for fire protection .
• Ingress Protection: Typically IP30 for indoor installations, with higher ratings available for moisture-prone areas.
• Mounting: Wall-mounted or recessed, depending on building design and accessibility requirements.

Component Layout

Inside the box, the layout usually includes:

• Incoming power terminals connected to dual power supplies or mains.
• Automatic Transfer Switch (ATS) for seamless backup activation.
• MCBs and RCDs for downstream circuit protection.
• Fire Alarm System (FAS) forced-closure modules to immediately illuminate emergency lighting during fire events .

Practical Notes

• The exact dimensions vary by manufacturer and project requirements. For example, CONLUXS and New Idea Electric offer customized boxes tailored to the number of circuits and fire-safety specifications .
• When planning installation, consider clearance for wiring, ventilation, and maintenance access, which may add 50–100 mm to each dimension. For precise measurements, it is recommended to request the manufacturer's datasheet for the specific model, as dimensions can differ based on circuit count, fire-resistance rating, and additional monitoring modules .