Difference Between Maintained and Non-Maintained Emergency Lights

Emergency lighting plays a critical role in protecting occupants during power failures, fires, and other emergencies. When normal lighting fails, emergency lights provide essential illumination along escape routes, helping people evacuate safely and reducing the risk of injury or panic.

This guide is intended for building owners, facility managers, and electrical contractors responsible for emergency lighting decisions. Choosing the correct emergency lighting system is crucial for ensuring occupant safety, meeting legal requirements, and optimising operational costs.

Understanding the difference between maintained and non-maintained emergency lighting is essential for building owners, landlords, facilities managers, and duty holders. While both systems serve the same core purpose, they operate differently and are suited to different types of buildings and occupancies.

This guide explains how each system works, where it is best used, and how to choose the right option for your premises.

Quick Answer: Maintained vs Non-Maintained Emergency Lighting

The primary distinction between maintained and non-maintained emergency lights lies in their power source and operational mode.

The main difference lies in when the lights operate.

Maintained emergency lights remain illuminated at all times during normal operation and automatically switch to battery power if the mains supply fails.

Non-maintained emergency lights stay off during normal conditions and only illuminate when there is a power failure or emergency.

In simple terms:

• Maintained lights = always on
• Non-maintained lights = on only during emergencies

Both systems must comply with British Standard BS 5266-1 and form part of a building’s overall fire safety strategy.

Understanding Emergency Lighting Systems

Emergency lighting is designed to provide illumination for a minimum of three hours during a power failure, allowing occupants to safely exit the building and enabling emergency services to operate effectively.

These systems are legally required in most commercial and public buildings and must illuminate:

• Escape routes and corridors
• Fire exits and final exit doors
• Changes in floor level
• Fire alarm call points and fire-fighting equipment

Modern emergency lighting systems are commonly LED-based and may be self-contained (with individual batteries) or connected to a central battery system. Regardless of type, all systems require regular testing and maintenance to remain compliant and reliable.

Emergency lighting should also integrate with the building’s wider fire safety systems, activating automatically when the mains power supply fails.

Maintained Emergency Lighting

How Emergency Lights Work

Maintained emergency lights operate continuously as part of the normal lighting system. When the mains power supply fails, they automatically switch to their internal battery without any interruption in illumination.

The batteries are kept fully charged during normal operation, allowing the lights to continue operating seamlessly during an emergency.

Where Maintained Emergency Lights Are Best Used

Maintained systems are most suitable for buildings where occupants may be unfamiliar with the layout, such as:

• Hospitals and care homes
• Shopping centres
• Leisure centres and entertainment venues
• Public buildings with high visitor turnover

Because the lights are already illuminated, occupants can instantly recognise escape routes during an emergency. This constant visibility can help reduce confusion and panic, particularly in busy or unfamiliar environments.

The trade-off is higher energy consumption, as the lights remain on during normal operation. In many public buildings, however, the added reassurance and visibility justify the additional running costs.

Non-Maintained Emergency Lighting

How Non-Maintained Emergency Lights Work

Non-maintained emergency lights are specifically intended for emergency use only, activating during power outages or when manually triggered. Non-maintained emergency lights remain off during normal operation and activate automatically only when the mains power supply is interrupted.

Their batteries are continuously charged in the background, ready to provide illumination when required. Once power is restored, the lights switch off and resume charging.

Where Non-Maintained Emergency Lights Are Best Used

Non-maintained systems are ideal for environments where occupants are familiar with escape routes, including:

• Offices
• Warehouses and factories
• Storage areas
• Staff-only or low-occupancy spaces

Because they only operate during emergencies, non-maintained lights are more energy efficient and often have longer battery life. This makes them a cost-effective and environmentally conscious option for many commercial premises.

Their discreet design also allows them to blend into modern interiors without impacting normal lighting aesthetics.

Key Differences at a Glance

Aspect	Maintained Emergency Lights	Non-Maintained Emergency Lights
Normal operation	Always illuminated	Off
Emergency operation	Switch to battery power	Switch on when power fails
Energy use	Higher	Lower
Best suited for	Public buildings, unfamiliar users	Offices, staff-only areas
Visibility during emergency	Immediate and continuous	Activates on power loss
Battery wear	Higher	Lower
Many buildings use a hybrid approach, installing maintained lighting in public and high-risk areas, and non-maintained lighting in back-of-house or low-occupancy spaces.

Choosing the Right Emergency Lighting for Your Building

Selecting the correct emergency lighting depends on several factors, including:

• Building use and occupancy levels
• Whether occupants are familiar with the layout
• Fire risk assessment findings
• Energy efficiency and long-term running costs

Public buildings generally benefit from maintained systems, while workplaces and industrial environments often suit non-maintained lighting. In practice, many premises achieve the best results by combining both types.

A professional assessment ensures the system design meets safety requirements while remaining practical and cost-effective.

Compliance and British Standards

Both maintained and non-maintained emergency lighting systems must comply with:

• BS 5266-1 (Emergency lighting – Code of practice)
• BS EN 1838 (Lighting requirements for escape routes)
• Regulatory Reform (Fire Safety) Order 2005

Emergency lighting must provide adequate illumination (typically 1 lux on escape routes) and be installed, tested, and certified by competent electricians.

The Responsible Person is legally required to ensure systems are compliant, operational, and properly maintained.

Maintenance and Testing Requirements

Emergency lighting systems must undergo regular testing to ensure they function properly in an emergency.

This includes:

• Monthly functional tests to confirm lights operate on battery power
• Annual full-duration tests to verify the minimum 3-hour operation
• Regular visual inspections for damage or obstruction

Testing requirements are the same for maintained and non-maintained systems. Accurate records must be kept for compliance and inspection purposes.

LED emergency lighting typically requires less ongoing maintenance, but testing schedules still apply regardless of technology.

Summary

Both maintained and non-maintained emergency lights play a vital role in fire safety and emergency evacuation. The key difference lies in how they operate during normal conditions and which environments they are best suited for.

Maintained systems provide constant reassurance in public buildings, while non-maintained systems offer an energy-efficient solution for workplaces and familiar environments. Many buildings benefit from using a combination of both.

Choosing the right emergency lighting starts with understanding your building, your occupants, and your legal responsibilities — and ensuring systems are designed, installed, and maintained correctly.

Frequently Asked Questions