# Summation energy meter

Canonical URL: https://eloragrid.ai/symbols/summation-energy-meter
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: Σ kWh
Drawing use: SLD, Schematic
Reference families: IEC, Manufacturer

Integrating device that adds energy from several meters or circuits to give one total register.

## In plain English

### What does Summation energy meter mean?

A summation meter totalises energy from more than one circuit. It may count pulses from several transmitting meters or, in older schemes, be fed by a summation CT, and it appears where several incomers or feeders must be billed or monitored as one supply.

### A simple example

Every input must use the same direction convention and consistent pulse weights, or the total is wrong. The symbol shows the summing function but not the inputs, so each source meter should be listed with its weighting.

### What the drawings help you do

List every meter or circuit that feeds the total. Check pulse weights and directions are consistent. A summation meter totals several circuits; a summation CT adds currents before measurement.

### This particular reference

Integrating device that adds energy from several meters or circuits to give one total register. A summation meter totals several circuits; a summation CT adds currents before measurement.

### Terms

- Signal: Electrical information passed between devices, rather than necessarily the main power supply.
- Schematic: A drawing showing function and connections rather than physical appearance.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/)
- [Power and energy measurement quantities](https://www.se.com/ph/en/faqs/FA343278/)


## What it represents

A summation meter totalises energy from more than one circuit. It may count pulses from several transmitting meters or, in older schemes, be fed by a summation CT, and it appears where several incomers or feeders must be billed or monitored as one supply.
Every input must use the same direction convention and consistent pulse weights, or the total is wrong. The symbol shows the summing function but not the inputs, so each source meter should be listed with its weighting.

## How to read it

- List every meter or circuit that feeds the total.
- Check pulse weights and directions are consistent.

## Information to show or reference

- List input meters
- State weighting per input
- Define direction convention

## Important distinction

A summation meter totals several circuits; a summation CT adds currents before measurement.

## Facts

- Function: Totalises energy from several circuits
- Inputs: Pulse inputs or summated current
- Preview: Independent educational concept; consult the applicable standard and project legend for the exact graphic

## Public references

- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/) — IEC. IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced.
- [Power and energy measurement quantities](https://www.se.com/ph/en/faqs/FA343278/) — Schneider Electric. Public explanation of energy and power measurement quantities used by meters.

## 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.