# Maintained emergency luminaire plan mark

Canonical URL: https://eloragrid.ai/symbols/iec-maintained-emergency-luminaire
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: EM-M
Drawing use: GA
Reference families: IEC

## Symbol convention

Convention: IEC
Form: Emergency luminaire, maintained
IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

Plan mark for an emergency luminaire whose lamp is lit at all times and stays lit on supply failure.

## In plain English

### What does Maintained emergency luminaire plan mark mean?

A maintained emergency luminaire operates as a normal light and continues on battery when the normal supply fails. Plans usually draw the luminaire mark with an emergency indicator, such as a filled segment or a letter E, plus an M or maintained tag.

### A simple example

Maintained operation is common in places of assembly, cinemas and some exit signs. The fitting needs both a switched supply for normal operation (where switched maintained) and an unswitched permanent supply to charge the battery and sense failure.

### What the drawings help you do

The tag does not give the duration. Emergency duration (for example 1 h or 3 h) should appear in the schedule or legend.

### This particular reference

Plan mark for an emergency luminaire whose lamp is lit at all times and stays lit on supply failure. A non-maintained emergency luminaire lights only on supply failure; the maintained form is lit continuously.

### Terms

- Schematic: A drawing showing function and connections rather than physical appearance.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/)
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design)


## What it represents

A maintained emergency luminaire operates as a normal light and continues on battery when the normal supply fails. Plans usually draw the luminaire mark with an emergency indicator, such as a filled segment or a letter E, plus an M or maintained tag.
Maintained operation is common in places of assembly, cinemas and some exit signs. The fitting needs both a switched supply for normal operation (where switched maintained) and an unswitched permanent supply to charge the battery and sense failure.
The tag does not give the duration. Emergency duration (for example 1 h or 3 h) should appear in the schedule or legend.

## How to read it

- Look for the M tag or legend key.
- Check the unswitched supply is shown.

## Information to show or reference

- State duration.
- Provide permanent unswitched supply.
- Mark test facility or self-test type.

## Important distinction

A non-maintained emergency luminaire lights only on supply failure; the maintained form is lit continuously.

## Facts

- Operation: Lit in normal and emergency modes
- Supply: Permanent live for charging and sensing
- Exact standard graphic: Not reproduced here; confirm the form against IEC 60617 and the project legend

## Public references

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/) — IEC. IEC graphical symbol context for installation plans; independently drawn here.
- [Electrical installation design methodology and references](https://www.electrical-installation.org/enwiki/General_rules_of_electrical_installation_design) — Schneider Electric — Electrical Installation Guide. Installation design methodology covering lighting circuits and final distribution.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.