# Switchroom fire-door status interface

Canonical URL: https://eloragrid.ai/symbols/switchroom-fire-door-status-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: SFSI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchrooms
Input: Door position contact
Output: Door status indication

Receives the monitored fire-door position used by the room supervisory system.

## In plain English

### What this block does

Receives the monitored fire-door position used by the room supervisory system.

### A simple example

In a switchroom, the fire panel may report detection, system faults and a separately documented shutdown request to the station controller. These signals have different meanings and must not be combined into one unexplained alarm. For this reference, the drawing identifies “Door position contact” at the input and “Door status indication” at the output. Door status alone does not establish compartment integrity.

### What the drawings help you do

Start at the named input: Door position contact. Identify its source device or document and the state represented on the drawing. Follow the named output: Door status indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Door position contact
- Output: Door status indication
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Door position contact → SFSI → Door status indication
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

Receives the monitored fire-door position used by the room supervisory system. A fire-system interface passes defined indications and control requests between the fire installation and electrical equipment. The receiving circuit must identify the exact purpose of the signal and the equipment it affects.
In a switchroom, the fire panel may report detection, system faults and a separately documented shutdown request to the station controller. These signals have different meanings and must not be combined into one unexplained alarm. For this reference, the drawing identifies “Door position contact” at the input and “Door status indication” at the output. Door status alone does not establish compartment integrity.
Use the coordinated fire cause-and-effect schedule to define each response. Original interface blocks describe signal roles without specifying suppression operation, evacuation behavior or life-safety performance. 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: Door position contact. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Door status indication. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Door status alone does not establish compartment integrity.
- Use the coordinated fire cause-and-effect schedule to define each response. Original interface blocks describe signal roles without specifying suppression operation, evacuation behavior or life-safety performance.

## Information to show or reference

- Label the source and connection reference for door position contact.
- Identify the destination and defined state of door status indication.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Door status alone does not establish compartment integrity.

## Important distinction

Door status alone does not establish compartment integrity. 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: Door position contact
- Output / connection: Door status indication
- Lookup label: SFSI 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 fire and emergency 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.