MD
Maximum-demand indicator
Indicating instrument with a resettable pointer or register showing the highest averaged current or power reached.
SLD / Schematic
Symbols · kWh/MD
Energy meter with maximum-demand indicator
Energy meter that also records the highest average power over a fixed demand interval for demand charging.
In plain English
What does Energy meter with maximum-demand indicator mean?
This meter totalises energy and also keeps the maximum average power reached in any demand interval, such as 15 or 30 minutes. Large supplies are often billed partly on that maximum demand, so the meter form appears on the supply single-line diagram with the demand interval stated nearby.
A simple example
The demand register is reset periodically, usually at the end of a billing period. The symbol does not show the interval, whether it uses fixed blocks or a sliding window, or how reset is performed, and those settings change the recorded value.
What the drawings help you do
Find the demand interval and window type. Check how and when the demand register is reset. A maximum-demand meter records peak averaged power plus energy; a maximum-demand indicator shows only the peak value.
This particular reference
Energy meter that also records the highest average power over a fixed demand interval for demand charging. A maximum-demand meter records peak averaged power plus energy; a maximum-demand indicator shows only the peak value.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Power and energy measurement quantities · PowerLogic ION9000 user manual
SLD / Schematic · kWh/MD
What it represents
This meter totalises energy and also keeps the maximum average power reached in any demand interval, such as 15 or 30 minutes. Large supplies are often billed partly on that maximum demand, so the meter form appears on the supply single-line diagram with the demand interval stated nearby.
The demand register is reset periodically, usually at the end of a billing period. The symbol does not show the interval, whether it uses fixed blocks or a sliding window, or how reset is performed, and those settings change the recorded value.
How to read it
- Find the demand interval and window type.
- Check how and when the demand register is reset.
Information to show or reference
- State demand interval
- Show reset arrangement
- Reference tariff requirement
A distinction that matters
A maximum-demand meter records peak averaged power plus energy; a maximum-demand indicator shows only the peak value.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Power and energy measurement quantities
Public explanation of energy and power measurement quantities used by meters.
PowerLogic ION9000 user manual
Public meter manual describing measurement, logging and recording features of a revenue and power-quality meter.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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