# Switchroom maintained-lighting control interface

Canonical URL: https://eloragrid.ai/symbols/switchroom-maintained-lighting-control-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: SMCI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchrooms
Input: Normal lighting control
Output: Maintained luminaire interface

Separates the normal operating command from the emergency supply behavior of maintained lighting.

## In plain English

### What this block does

Separates the normal operating command from the emergency supply behavior of maintained lighting.

### A simple example

In a switchroom, a normal lighting branch may be switched locally while the specified emergency luminaires remain connected to their own backed-up or integral supply. For this reference, the drawing identifies “Normal lighting control” at the input and “Maintained luminaire interface” at the output. The exact wiring follows the selected fitting.

### What the drawings help you do

Start at the named input: Normal lighting control. Identify its source device or document and the state represented on the drawing. Follow the named output: Maintained luminaire interface. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Normal lighting control
- Output: Maintained luminaire interface
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Normal lighting control → SMCI → Maintained luminaire interface
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Indoor substation: lighting, fire and auxiliary services](https://www.electrical-installation.org/enwiki/Indoor_substation)


## What it represents

Separates the normal operating command from the emergency supply behavior of maintained lighting. Lighting and access interfaces coordinate the electrical-room service circuits and their supervision. Normal lighting, emergency illumination and access indication have different power sources and purposes.
In a switchroom, a normal lighting branch may be switched locally while the specified emergency luminaires remain connected to their own backed-up or integral supply. For this reference, the drawing identifies “Normal lighting control” at the input and “Maintained luminaire interface” at the output. The exact wiring follows the selected fitting.
Identify the lighting supply type, controlled circuit and the meaning of any test or failure output. A drawing symbol does not establish illumination levels, emergency duration or an approved egress arrangement. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

## How to read it

- Start at the named input: Normal lighting control. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Maintained luminaire interface. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The exact wiring follows the selected fitting.
- Identify the lighting supply type, controlled circuit and the meaning of any test or failure output. A drawing symbol does not establish illumination levels, emergency duration or an approved egress arrangement.

## Information to show or reference

- Label the source and connection reference for normal lighting control.
- Identify the destination and defined state of maintained luminaire interface.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The exact wiring follows the selected fitting.

## Important distinction

The exact wiring follows the selected fitting. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

## Facts

- Representation: Functional block
- Installation focus: Switchrooms
- Input / boundary: Normal lighting control
- Output / connection: Maintained luminaire interface
- Lookup label: SMCI is a library lookup label, not a standard device designation.

## Public references

- [Indoor substation: lighting, fire and auxiliary services](https://www.electrical-installation.org/enwiki/Indoor_substation) — Schneider Electric. Public technical context for switchroom lighting and access interfaces. Lighting, emergency lighting, fire provisions and substation auxiliary services. Original cause-and-effect examples require project design. The application text and educational graphic are independently authored; the publisher does not certify this representation.

## 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.