# Switchroom water-ingress detection interface

Canonical URL: https://eloragrid.ai/symbols/switchroom-water-ingress-detection-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: SWDI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchrooms
Input: Water-detection contact
Output: Water-ingress alarm

Receives the installed water detector's indication for the assigned room or trench area.

## In plain English

### What this block does

Receives the installed water detector's indication for the assigned room or trench area.

### A simple example

In a switchroom, water ingress, temperature, humidity and equipment-service alarms can be sent to the station controller with separate point names so an operator can identify the affected area. For this reference, the drawing identifies “Water-detection contact” at the input and “Water-ingress alarm” at the output. The detector covers only its defined sensing area.

### What the drawings help you do

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

### Terms

- Input: Water-detection contact
- Output: Water-ingress alarm
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Water-detection contact → SWDI → Water-ingress alarm
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Ventilation in MV substations](https://www.electrical-installation.org/enwiki/Ventilation_in_MV_Substations)


## What it represents

Receives the installed water detector's indication for the assigned room or trench area. Environmental supervision turns measurements or contact states into clearly named room-service indications. A sensor measures a condition; the supervisory function decides whether the assigned alarm or control response is needed.
In a switchroom, water ingress, temperature, humidity and equipment-service alarms can be sent to the station controller with separate point names so an operator can identify the affected area. For this reference, the drawing identifies “Water-detection contact” at the input and “Water-ingress alarm” at the output. The detector covers only its defined sensing area.
Keep sensor location, alarm thresholds, delay and monitoring coverage in the room-services schedule. An environmental alarm is a diagnostic input, not a complete assessment of electrical equipment condition. 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: Water-detection contact. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Water-ingress alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The detector covers only its defined sensing area.
- Keep sensor location, alarm thresholds, delay and monitoring coverage in the room-services schedule. An environmental alarm is a diagnostic input, not a complete assessment of electrical equipment condition.

## Information to show or reference

- Label the source and connection reference for water-detection contact.
- Identify the destination and defined state of water-ingress alarm.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The detector covers only its defined sensing area.

## Important distinction

The detector covers only its defined sensing area. 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: Water-detection contact
- Output / connection: Water-ingress alarm
- Lookup label: SWDI is a library lookup label, not a standard device designation.

## Public references

- [Ventilation in MV substations](https://www.electrical-installation.org/enwiki/Ventilation_in_MV_Substations) — Schneider Electric. Public technical context for switchroom environmental supervision. Heat removal, condensation and environmental design context. 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.