Emergency lighting in the United States must switch on automatically when normal power fails, cover the path people take to leave the building, and keep running for at least 90 minutes. The details come from model codes (the International Building Code and NFPA 101), OSHA for workplaces, and the state and local officials who adopt and enforce them. This guide walks through each requirement, who it applies to, and what testing and recordkeeping look like.
TL;DR
- Emergency lights must come on automatically at a power loss and run for at least 90 minutes along the means of egress, under the International Building Code as adopted in South Carolina.
- Light levels start at an average of 1 foot-candle at floor level and may fade to 0.6 by the end of the 90 minutes.
- OSHA requires workplace exit routes to be adequately lit and exit signs to reach at least 5 foot-candles.
- Test monthly and annually and keep the records. Seattle, for one, asks for three years of records on site.
- Single-family homes are generally outside these rules. Commercial buildings, common areas and many multifamily corridors are not.
Table of Contents
- Who sets the rules
- Where emergency lights are required
- How long and how bright
- What OSHA requires in workplaces
- Testing requirements and records
- Do homes need emergency lighting?
- Common failures we see inspectors flag
- Our perspective
- Get your emergency lighting checked in Myrtle Beach
- FAQ
- Sources
Who sets the rules
No single federal code governs every building. Requirements are written into national standards such as NFPA 101 (the Life Safety Code) and the International Building Code, and then adopted and enforced by state and local authorities. The edition your building falls under depends on where it stands.
In South Carolina, for example, the 2021 South Carolina Building Code carries the IBC's means of egress chapter, including the emergency lighting provisions quoted below. Your local building official and fire marshal are the final word on which edition applies, and they can add amendments. Always confirm with them before you design or replace a system.
Three layers usually overlap:
- Building code (IBC or state equivalent): what must be installed when a building is built or renovated.
- Fire code and NFPA 101: how the system must be inspected, tested and maintained over its life.
- OSHA: what an employer must keep working so employees can leave safely.
The electrical side, wiring the emergency circuits, choosing batteries or generators, is governed by the National Electrical Code and its article on emergency systems, which is where a licensed electrician comes in.
Where emergency lights are required
The short version: anywhere people have to find their way out when the building is occupied and the lights go out.
The IBC requires emergency lighting in all buildings, with exceptions for Group U utility structures, dwelling units in Group R, and sleeping units in Group I. NFPA 101 likewise calls for it in stairs, aisles, corridors and passageways leading to an exit across occupancies such as assembly, educational, hotel, mercantile and business.
What the building code lists
The South Carolina edition of the IBC says that when power fails, an emergency electrical system must automatically illuminate these areas:
- Aisles, corridors, and exit access stairways and ramps in rooms and spaces that require two or more exits
- Interior and exterior exit stairways and ramps, exit passageways, and vestibules and areas at the level of discharge used for exit discharge
- Electrical equipment rooms, fire command centers, fire pump rooms and generator rooms
- Public restrooms larger than 300 square feet
Those lists are in Section 1008.3 of the 2021 South Carolina Building Code. A Seattle Fire Department memo describes the same idea in plain terms: lighting for aisles, corridors, stairways and exits so people can leave quickly and safely while the building is occupied.
Exterior paths
Exterior lighting is where owners get tripped up. The exit stair and ramp provisions above include exterior exit stairways, and the exit discharge area near the door is covered too. Beyond that point, a lighting designer and your fire marshal decide how far outside the system must reach, since the goal is a safe path to a public way. If the route to the street is not obvious or is poorly lit, expect the inspector to ask about it.
Generators do not replace battery units automatically
A common assumption is that a standby generator solves the problem. It does not unless the generator and transfer switch are listed and installed as an emergency system under NEC Article 700 and the generator can restore power fast enough. Many owners with ordinary standby generators still need battery-backed exit and egress lights. If you run a generator at a business, ask your electrician to confirm which category it falls into before you remove any battery units. Our generator connection work always starts with that question.
How long and how bright
Two numbers matter most: duration and illumination.
Duration. The emergency power system must supply power for not less than 90 minutes and may consist of storage batteries, unit equipment or an on-site generator. NFPA 101 matches that: emergency lighting illuminates automatically for at least 90 minutes after normal power is lost.
Illumination. Per the same South Carolina code section:
| Measure | Requirement |
|---|---|
| Initial average along the path of egress, at floor level | Not less than 1 foot-candle (11 lux) |
| Minimum at any point, initially | 0.1 foot-candle (1 lux) |
| Average at the end of the 90 minutes | May decline to 0.6 foot-candle (6 lux) |
| Minimum at any point at the end | 0.06 foot-candle (0.6 lux) |
| Uniformity (maximum to minimum) | Not to exceed 40 to 1 |
The uniformity ratio is why placement matters as much as brightness. A single bright fixture with dark gaps on either side fails, even if the average looks fine on paper. Manufacturer layout tools help, and so does a walk-through. A Kansas fire marshal's office notes that measuring light levels is often impractical and recommends testing the lighting in the dark to see whether paths are visible.
Battery backup is only as good as its battery
The 90-minute figure assumes a healthy battery. Batteries age, and a unit that works in January can fail by summer. The logic is the same as any standby power device: a battery backup safety checklist shows how a quick regular check catches the weak battery before the outage does. For emergency lights, that regular check is the monthly test described below.
What OSHA requires in workplaces
If you employ people, OSHA's exit route standard applies on top of the building code. Under 29 CFR 1910.37:
- Each exit route must be adequately lighted so an employee with normal vision can see along it.
- Exit route safeguards, including lighting, must be maintained and work at all times.
- Illuminated exit signs must have a surface value of at least 5 foot-candles (54 lux).
OSHA is less prescriptive than the building code about runtime, which is why most employers design to the 90-minute code number and use OSHA as the "keep it working" rule. A burned-out exit sign or a dead battery is an OSHA problem on the day it is found, not only at the next fire inspection. For warehouse and industrial spaces, our guide to warehouse lighting types and OSHA considerations covers how general lighting and egress lighting fit together.
Testing requirements and records
The second most common search on this topic is how often emergency lights must be tested. The pattern across NFPA 101 and local fire departments looks like this.
Monthly
The Seattle Fire Department memo says monthly activation tests must confirm that emergency lighting activates automatically at power failure and stays on for at least 30 seconds. For self-testing and self-diagnostic units, NFPA 101 calls for a visual inspection every 30 days to confirm the unit is undamaged and no trouble indicator is lit.
In practice: press the test button or trip the unit's test switch, confirm the lamp heads come on and stay lit, and check that charging indicators are normal.
Annually
The same Seattle memo refers to both monthly and annual test records. The annual test is the full-duration test, where the unit runs on battery for the full required period and still delivers usable light at the end. Check with your local fire official for the exact method they accept, since self-testing equipment and local amendments change the details.
Records
Seattle asks that test records be kept on the premises for at least three years and be available for inspection. A useful log lists the unit location, test date, pass or fail, and who did the test. Even where your jurisdiction does not set the same retention period, that format is what inspectors expect to see.
Who should do the work
When the building has a generator or other emergency power supply system, NFPA says inspection, testing and maintenance must be done by a qualified person with the necessary skills and safety training. Maintenance follows the manufacturer's instructions, and a 30-minute operational test follows any repair or maintenance. For a deeper look at inspections tied to healthcare surveys, see our guide on emergency lighting tests for facility managers.
Do homes need emergency lighting?
For a typical single-family house, no code requires you to install emergency egress lighting. The IBC exempts dwelling units in residential occupancies, and the South Carolina edition also exempts dwelling units in Groups R-1, R-2 and R-3 from the normal-power egress illumination rule in Section 1008.2.
That does not mean homeowners should ignore the topic:
- Shared spaces still count. An apartment building's corridors, exit stairs and lobbies are not dwelling units. Property managers typically have to meet emergency lighting rules there.
- Home businesses and rentals vary. A short-term rental, a home daycare or a business operated from a converted house may fall into a different occupancy. Ask your local building department how it is classified.
- Safety is still sensible. Plug-in battery lights in hallways and stairs, or a battery storage system that keeps selected circuits running, give you light during an outage even though the code does not demand it. Our battery storage installation is one way to power key circuits.
The local authority having jurisdiction, usually the county or city building and fire departments, decides how a particular property is classified. When in doubt, call before you buy equipment.
Common failures we see inspectors flag
These are patterns worth checking before an inspection, not statistics:
- Dead or aged batteries in unit equipment that has never been tested.
- Missing or unlit exit signs after a remodel moves walls or doors.
- Lights blocked by new shelving, ductwork or partitions that leave dark spots in the path.
- Unswitched circuits. Emergency fixtures that share a switched circuit with normal lighting can go dark when someone turns the room off.
- No records. The equipment works, but there is no log to prove it.
- Generator assumptions. A standby generator was installed, battery units were removed, and nobody confirmed it qualified as an emergency system.
Remodels are the biggest trigger. Moving a wall or adding a tenant space changes the path of egress, so the emergency lighting plan needs a fresh look. That is also the moment to bring in an electrician for remodel and new construction planning.
Our perspective
We see emergency lighting go wrong in the gap between installation and the next ten years. The fixtures are rarely the problem on day one. The trouble is a dead battery nobody tested, a sign that disappeared in a tenant buildout, or a layout nobody revisited after a wall moved.
So we push owners toward two habits. First, walk the building in the dark with us during the consultation. It is the fastest way to find real gaps, and it matches what fire officials recommend. Second, send photos of your exit paths, panel and existing fixtures before we arrive. Our consultations are built around customer-supplied photos, and they let us plan the work, the materials and the circuits before anyone is on a ladder.
A code number on paper is a minimum. The goal is that on the worst night, a person who has never been in your building can find the door.
— Logan
Get your emergency lighting checked in Myrtle Beach
If you manage a business, rental or commercial property in the Myrtle Beach area, we handle emergency and exit lighting from the first walk-through to the repair work, including emergency and exit lighting repair when a unit fails its test.
Send us photos of your exit paths and existing fixtures, and we will plan the work with you and give you a free estimate. For ongoing upkeep, our electrical inspections and maintenance and commercial maintenance plan keep testing from slipping. You can also start from our services page.
FAQ
What are the minimum requirements for emergency lighting?
It must turn on automatically when normal power fails, cover aisles, corridors, stairs and exits, and last at least 90 minutes. The path must average 1 foot-candle at floor level at the start and may fall to 0.6 at the end. Your state or local adopted code sets the exact edition.
What does OSHA require for emergency lighting?
OSHA requires exit routes to be adequately lighted so employees can see, and lighting safeguards must work at all times. Illuminated exit signs need a surface value of at least 5 foot-candles. Employers should treat a failed fixture as a violation risk until it is fixed.
How often do emergency lights need to be tested?
Generally once a month for a short activation check and once a year for a full-duration test, with records kept. Self-testing units still call for a 30-day visual check under NFPA 101. Your local fire department may set specific retention periods, so ask them.
Are emergency lights required in houses?
Not in single-family homes, because the building code exempts dwelling units. Shared areas such as apartment corridors and stairs are different, and a home used for a business may be classified differently. Check with your local building department.
Sources
- 2021 South Carolina Building Code, Chapter 10 Means of Egress
- Do you know the requirements for emergency lighting systems? (Consulting-Specifying Engineer)
- NFPA 101, NFPA Journal
- Seattle Fire Department Client Assistance Memo 5974: Emergency Lighting
- OSHA 29 CFR 1910.37
- Kansas State Fire Marshal: Emergency Lighting
- NFPA: Maintaining your emergency power supply system
- Battery backup safety checklist