---
title: "Purposes of emergency lighting installation"
subject: "Industrial Power Distribution and Illumination"
chapter: 9
key: "semester_6/industrial_power_distribution_and_illumination:emergency-lighting-purposes"
source: https://www.bctengineer.com/q/semester_6/industrial_power_distribution_and_illumination/emergency-lighting-purposes
site: BCT Engineering
---

# Purposes of emergency lighting installation

Industrial Power Distribution and Illumination · Chapter 9: Emergency and Backup Supply Systems

- Asked in: 2072 Magh, 4 marks
- Video: [Where Do We Need Exit Signs & Emergency Lights?](https://www.youtube.com/watch?v=88b9yX6R__c) — Electrician U
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_6/industrial_power_distribution_and_illumination/emergency-lighting-purposes
- Whole chapter: https://www.bctengineer.com/md/semester_6/industrial_power_distribution_and_illumination/chapter-9

## Question

Write down main purposes for installation of emergency lighting in industry.

## Short answer

Emergency lighting provides safe evacuation, exit identification, safe shutdown, panic prevention, locating fire equipment, rescue support, continued essential work, and legal compliance. It must operate automatically from an independent source when the normal supply fails.

## Answer

**Emergency lighting** is lighting that operates automatically from an independent source when the normal lighting supply fails. Its main purposes in an industry are:

1. **Safe evacuation:** light escape routes, corridors, stairs and exits so people can leave quickly and safely.
2. **Exit identification:** keep exit and direction signs lit so the way out is clear.
3. **Safe shutdown:** let operators stop machines, close valves and make processes safe (high-risk task lighting).
4. **Avoid panic and accidents** near moving machinery, open pits, hot or hazardous areas.
5. **Locate fire-fighting and safety equipment:** extinguishers, call points, first-aid boxes.
6. **Help rescue and fire-fighting teams** during an emergency.
7. **Continue essential work** (standby lighting) in control rooms, substations and medical rooms.
8. **Meet legal requirements** of fire and factory safety codes (about 1 lux minimum on escape routes for 1–3 h).

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What defines emergency lighting?
   A. Lighting that is switched on manually by the operator during a fire
   B. Lighting that is brighter than normal lighting
   C. Lighting that operates automatically from an independent source when normal supply fails
   D. Lighting used only in the outdoor yard
   Answer: C. Emergency lighting works automatically from an independent source when the normal supply fails. (Key point: Definition)

2. Why is emergency lighting needed at high-risk work positions in industry?
   A. So production can continue at full output
   B. So operators can stop machines, close valves and make processes safe
   C. To save electricity costs
   D. To replace normal lighting permanently
   Answer: B. Safe shutdown task lighting lets operators make processes safe when normal lighting fails. (Key point: Safe shutdown)

3. What is the key purpose of lighting escape routes, stairs and exit signs?
   A. Quick and safe evacuation of people
   B. Decorating the building
   C. Advertising the plant name
   D. Reducing the fire load
   Answer: A. Lit corridors and exit signs let people find the way out quickly, avoiding panic. (Key point: Escape route lighting)

4. What minimum illumination on escape routes is mentioned for meeting fire and factory safety codes?
   A. About 100 lux for 10 min
   B. About 1 lux for 1-3 hours
   C. About 10 lux for 30 s
   D. About 500 lux for 8 hours
   Answer: B. Codes require roughly 1 lux minimum on escape routes for 1-3 hours. (Key point: Legal requirement)

## Related in Industrial Power Distribution and Illumination

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