Power systems vary worldwide—so international emergency lighting must account for 220–240V inputs, 50/60 Hz frequency, and longer outage windows. This guide explains how to specify export-ready units (transformer swaps, 6/12/24V DC buses, voltage drop, and extended runtime) so projects abroad stay safe and code-ready—without risking equipment damage.
Last updated: October 2025
Overview: Why International Specs Matter
U.S. emergency units expect domestic power (often 120/277 VAC, 60 Hz). Deploying into regions using 220–240 VAC at 50 Hz without re-configuring the charger/driver can destroy electronics and reduce battery life. The solution is a factory build (or engineered retrofit) that matches input voltage/frequency while preserving the fixture’s internal DC bus.
Voltage & Frequency Compatibility (110–120V vs 220–240V; 50/60 Hz)
- Voltage regions: 110–120V (U.S./Canada/etc.) vs 220–240V (most of the world). Matching input is critical for charger life and safety.
- Frequency: Many chargers are 50/60 Hz-tolerant—confirm on submittals; avoid 60 Hz-only parts on 50 Hz grids.
- Brownout resilience: In low-stability grids, require sag tolerance and clean recovery without nuisance trips.
Configuring Export-Ready Units (Transformers, 6/12/24V DC buses)
How it works: A transformer/driver swap adapts the AC input (e.g., 230V/50 Hz) while preserving the fixture’s internal DC bus—typically 6VDC, 12VDC, or 24VDC. Lamps/boards remain the same; chargers and control electronics are protected.
- Why 24VDC? Supports higher watt loads, longer runs, and more remote heads with less voltage drop.
- Enclosures: Steel housings handle tough environments and larger battery sets cleanly.
- Environment: Where moisture/wash-downs are expected, specify wet-location or NEMA-rated enclosures per spec.
Extended Runtime for Unstable Grids
Standard emergency lighting provides ~90 minutes. In areas with rolling blackouts or multi-hour outages, specify extended runtime systems. Heavy-duty 24V builds are commonly sized for 3–10 hours so egress routes remain illuminated for the full outage window.
Voltage Drop Basics & Wire Sizing Tips
Long runs and small-gauge wire cause dim lamps and early battery depletion. Keep runs short, choose higher system voltage (e.g., 24V), and upsize conductors on long branches.
- Shorter runs + higher voltage: 24V systems reduce current and drop, improving brightness.
- Remote heads: Sum head wattage per circuit; size conductors for acceptable % drop per your standard.
Common International Use Cases
- Manufacturing plants and offshore operations requiring 230V/50 Hz compatibility
- Energy sector facilities (refineries, terminals) with rough-service demands
- Remote clinics, schools, and government buildings with unstable power
- Construction sites and logistics centers relying on generators
Export Submittal Checklist
- Confirm input: 220–240 VAC and 50/60 Hz tolerance documented
- Select DC bus: 6/12/24V based on load and run lengths
- Specify runtime: standard 90 min or extended (e.g., 3–10 hours)
- Environment: indoor/wet/NEMA enclosure as required
- Remote heads: wattage per circuit + conductor sizing notes
- Code/standards: UL 924 for U.S.; verify local approvals/markings with the AHJ
FAQ
Can a standard 120V emergency light be used on 230V?
No. Use a factory build (or engineered retrofit) with the correct transformer/charger for 220–240V input.
Does 50 Hz vs 60 Hz matter?
Often the chargers are rated for 50/60 Hz, but always confirm on submittals. If 50 Hz isn’t supported, lifespan and performance can suffer.
When should I choose 24V systems?
When you need longer wire runs, more remote heads, or extended runtime. Higher bus voltage reduces current and voltage drop.
How do I plan runtime for frequent blackouts?
Size extended-runtime packs to the longest expected outage window (e.g., 3–10 hours) and verify total load vs battery capacity.