# Station DC essential-load priority map

Canonical URL: https://eloragrid.ai/symbols/station-dc-essential-load-priority-map
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: SDEPM
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: substations
Input: DC load schedule
Output: Priority classification

Associates each assigned DC load with its documented operating priority.

## In plain English

### What this block does

Associates each assigned DC load with its documented operating priority.

### A simple example

In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “DC load schedule” at the input and “Priority classification” at the output. Priority does not establish required battery autonomy.

### What the drawings help you do

Start at the named input: DC load schedule. Identify its source device or document and the state represented on the drawing. Follow the named output: Priority classification. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: DC load schedule
- Output: Priority classification
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: DC load schedule → SDEPM → Priority classification
A reading guide. The entry's original illustration and input/output facts describe this application.

- [MicroGenius S2/S4 battery charger technical manual](https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf)


## What it represents

Associates each assigned DC load with its documented operating priority. A station battery system supplies protection, control and other assigned DC loads through a documented charger and distribution arrangement. Charger output, battery contribution and load distribution are related but separately monitored paths.
In a substation control building, the battery can support breaker trip circuits while the charger AC supply is unavailable. Supervision must identify whether the charger, battery or a downstream feeder is affected. For this reference, the drawing identifies “DC load schedule” at the input and “Priority classification” at the output. Priority does not establish required battery autonomy.
Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy. 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: DC load schedule. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Priority classification. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Priority does not establish required battery autonomy.
- Identify every source, protective device, isolation boundary and return. Battery capacity, DC fault duty, charging settings and ventilation require the selected battery-system design; illustrative circuits do not establish autonomy.

## Information to show or reference

- Label the source and connection reference for dc load schedule.
- Identify the destination and defined state of priority classification.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Priority does not establish required battery autonomy.

## Important distinction

Priority does not establish required battery autonomy. 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: Substations
- Input / boundary: DC load schedule
- Output / connection: Priority classification
- Lookup label: SDEPM is a library lookup label, not a standard device designation.

## Public references

- [MicroGenius S2/S4 battery charger technical manual](https://www.sens-usa.com/hubfs/Controlled%20Files/Manuals/101330_MGS_User_Manual.pdf) — SENS. Public technical context for station battery and charger distribution. Battery charging modes, DC distribution interfaces and charger alarms. 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.