EM-M
Maintained emergency luminaire plan mark
Plan mark for an emergency luminaire whose lamp is lit at all times and stays lit on supply failure.
IEC
IEC · EM-NM
Non-maintained emergency luminaire plan mark
Plan mark for an emergency luminaire that lights only when the normal lighting supply fails.
In plain English
What does Non-maintained emergency luminaire plan mark mean?
Non-maintained emergency luminaires stay off while the normal supply is healthy and light from their internal battery on failure. Plans show the emergency luminaire mark with NM or with the legend distinguishing it from maintained fittings, typically along escape routes and at changes of direction.
A simple example
The luminaire must monitor the local lighting circuit, so its permanent supply is taken from the same final circuit as the normal lighting in that area. The plan should make this relationship clear for the installer.
What the drawings help you do
The symbol does not show whether the unit is self-contained or fed from a central battery. The legend or schedule states the system type.
This particular reference
Plan mark for an emergency luminaire that lights only when the normal lighting supply fails. A maintained luminaire is lit continuously; this one only lights on failure.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams · Electrical installation design methodology and references
IEC · Emergency luminaire, non-maintained
IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
GA · EM-NM
What it represents
Non-maintained emergency luminaires stay off while the normal supply is healthy and light from their internal battery on failure. Plans show the emergency luminaire mark with NM or with the legend distinguishing it from maintained fittings, typically along escape routes and at changes of direction.
The luminaire must monitor the local lighting circuit, so its permanent supply is taken from the same final circuit as the normal lighting in that area. The plan should make this relationship clear for the installer.
The symbol does not show whether the unit is self-contained or fed from a central battery. The legend or schedule states the system type.
How to read it
- Confirm the unit monitors the local lighting circuit.
- Check spacing along escape routes.
Information to show or reference
- State duration and system type.
- Take permanent supply from local lighting circuit.
- Reference escape route plan.
A distinction that matters
A maintained luminaire is lit continuously; this one only lights on failure.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEC graphical symbols for diagrams
IEC graphical symbol context for installation plans; independently drawn here.
Electrical installation design methodology and references
Installation design methodology covering lighting circuits and final distribution.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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