# Switchroom access-door indication

Canonical URL: https://eloragrid.ai/symbols/switchroom-access-door-indication
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: SAI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchrooms
Input: Door contact
Output: Access-door status

Reports the selected room access-door position to the supervisory system.

## In plain English

### What this block does

Reports the selected room access-door position to the supervisory system.

### 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 “Door contact” at the input and “Access-door status” at the output. A closed contact is not proof of restricted access.

### What the drawings help you do

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

### Terms

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

Concept diagram: Door contact → SAI → Access-door status
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

Reports the selected room access-door position to the supervisory system. 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 “Door contact” at the input and “Access-door status” at the output. A closed contact is not proof of restricted access.
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: Door contact. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Access-door status. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- A closed contact is not proof of restricted access.
- 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 door contact.
- Identify the destination and defined state of access-door status.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: A closed contact is not proof of restricted access.

## Important distinction

A closed contact is not proof of restricted access. 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 contact
- Output / connection: Access-door status
- Lookup label: SAI 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.