Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Emergency and Egress Lighting
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### The normal architectural lighting layout, fixture types, and finishes are specified in [[sync/lighting-fixtures]]; this standard governs only the emergency function added to or independent of those fixtures. {note}
−### Normal and automatic lighting controls, including occupancy sensing and daylight dimming, are specified in [[sync/lighting-controls]]; emergency lighting shall override controls to full output on loss of normal power. {note}
+### Normal and automatic lighting controls, including occupancy sensing and daylight dimming, are specified in [[sync/lighting-controls]]; emergency lighting shall override controls to full output on loss of normal power.
### The on-site generator, its fuel system, and its transfer scheme as an emergency power source are specified in [[sync/generators]] and [[sync/emergency-and-standby-power]]; this standard governs only the lighting load and the bridging equipment at the luminaire. {note}
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max: 40
step: 5
−setpoints: [40]
+setpoints: [10, 40]
default: 40
note: 40:1 is the code ceiling. A tighter ratio improves spacing margin in long corridors and stairs.
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## Photometric Demonstration {toc}
−### Because the consequence of an under-illuminated egress path is concealed during normal operation and only revealed in an emergency, compliance shall be demonstrated by calculation rather than assumed from fixture count. {note}
+### Because the consequence of an under-illuminated egress path is concealed during normal operation and only revealed in an emergency, compliance shall be demonstrated by calculation rather than assumed from fixture count.
### The Contractor shall submit point-by-point photometric calculations, using the manufacturer's published IES files, demonstrating the required initial and end-of-duration illumination and the uniformity limit along the entire egress path.
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max: 1500
step: 100
−setpoints: [1100]
+setpoints: [500, 1100, 1500]
default: 1100
note: Emergency lumens delivered by the host luminaire on battery; confirm against the photometric layout.
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### A passive photoluminescent sign above a door is code-recognized only when it is UL 924 listed; UL 1994 listed products are egress path markings and are not recognized as exit signs, and Authorities routinely reject UL 1994-only signs at door positions. {note}
−### A photoluminescent exit sign requires continuous ambient illumination to charge; in zones where controls dim the ambient lighting below the charging threshold, the sign will not sustain its glow and shall not be used. {note}
+### A photoluminescent exit sign requires continuous ambient illumination to charge; in zones where controls dim the ambient lighting below the charging threshold, the sign will not sustain its glow and shall not be used.
### Exit signs shall be UL 924 listed.
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max: 200
step: 25
−setpoints: [125]
+setpoints: [125, 200]
default: 125
note: 125% is the minimum. Increase where future expansion or high driver inrush is expected.
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## Where the emergency power source is an on-site generator, normal architectural luminaires on dedicated emergency panels become the egress lighting, transferred by an automatic transfer switch. {note}
−## A generator is not instantaneous; the transfer switch and the generator start introduce a delay that battery equipment at critical points must bridge so the egress path is never dark during the transfer. {note}
+## A generator is not instantaneous; the transfer switch and the generator start introduce a delay that battery equipment at critical points must bridge so the egress path is never dark during the transfer.
## The transfer switch for an emergency system has stricter listing requirements than a standby switch; a switch listed only for optional standby use does not qualify. {note}
## The automatic transfer switch serving emergency lighting shall be listed for emergency system use per NEC 700.5(C), and shall be electrically operated and mechanically held.
−## Transfer of the emergency lighting load to the generator shall occur automatically within 10 seconds of loss of normal power, per NEC 700.12.
−
−## Battery-equipped luminaires or exit signs shall be provided at exit signs, stairs, and other critical egress points to bridge the transfer interval, and shall be specified wherever the generator start time may exceed 10 seconds, such as in cold climates without an engine pre-heat system.
−
−## The generator set, fuel storage, and testing intervals are governed by NFPA 110-2022 and are specified in [[sync/generators]]; the transfer time, bridging-battery requirement, and testing provisions shall be coordinated with that specification. {note}
−
```datasheet
label: Transfer switch listing
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```
+## Transfer of the emergency lighting load to the generator shall occur automatically within 10 seconds of loss of normal power, per NEC 700.12.
+
```datasheet
label: Maximum transfer time to generator
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max: 10
step: 1
−setpoints: [10]
+setpoints: [5, 10]
default: 10
note: NEC 700.12 ceiling. Battery bridging covers the generator start interval at critical points.
```
+## Battery-equipped luminaires or exit signs shall be provided at exit signs, stairs, and other critical egress points to bridge the transfer interval, and shall be specified wherever the generator start time may exceed 10 seconds, such as in cold climates without an engine pre-heat system.
+
```datasheet
label: Battery bridging at critical egress points
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```
+## The generator set, fuel storage, and testing intervals are governed by NFPA 110-2022 and are specified in [[sync/generators]]; the transfer time, bridging-battery requirement, and testing provisions shall be coordinated with that specification. {note}
+
# Electrical Installation {toc}
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## Exterior Exit Discharge {toc}
−### The exit discharge path from the exit door to the public way is part of the means of egress and must be illuminated, yet emergency circuits are frequently placed only inside the building, leaving the exterior path dark. {note}
+### The exit discharge path from the exit door to the public way is part of the means of egress and must be illuminated, yet emergency circuits are frequently placed only inside the building, leaving the exterior path dark.
### The path of egress from the exit door to the public way shall be illuminated by emergency luminaires on the emergency circuit or by battery-backed luminaires, per NFPA 101 §7.9.1.1.
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## All emergency luminaires and exit signs shall be UL 924 listed, regardless of technology type; UL 924 is the single required listing that makes the equipment code-recognized by NFPA 101 and the IBC. {note}
−## The installer shall be experienced in emergency lighting and Article 700 wiring separation and shall be able to demonstrate prior projects of comparable scope. {note}
+## The installer shall be experienced in emergency lighting and Article 700 wiring separation and shall be able to demonstrate prior projects of comparable scope.
## All emergency luminaires, exit signs, and power equipment shall bear a UL 924 listing mark.
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## Coordination {toc}
−### Emergency luminaire and exit sign locations shall be coordinated with the architectural reflected ceiling plan, structure, and mechanical and fire-suppression equipment to maintain required illumination and visibility. {note}
+### Emergency luminaire and exit sign locations shall be coordinated with the architectural reflected ceiling plan, structure, and mechanical and fire-suppression equipment to maintain required illumination and visibility.
−### The emergency lighting monitoring interface shall be coordinated with the building automation and fire alarm installers so the supervised output is terminated and verified. {note}
+### The emergency lighting monitoring interface shall be coordinated with the building automation and fire alarm installers so the supervised output is terminated and verified.
# Delivery, Storage, and Handling {toc}
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max: 10
step: 1
−setpoints: [5]
+setpoints: [1, 5, 10]
default: 5
```
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max: 10
step: 1
−setpoints: [5]
+setpoints: [1, 5, 10]
default: 5
```
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default: 2
```