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Recording instrument general symbol
General square form for an instrument that keeps a time record of a quantity rather than just displaying it.
SLD / Schematic
Symbols · A
Recording ammeter
Recording instrument that keeps a time record of current, drawn as a square marked A.
In plain English
What does Recording ammeter mean?
A recording ammeter logs current against time and is used to study load profiles, motor starting and feeder loading. It is connected in a CT secondary circuit, so like any CT-fed instrument its input forms part of a loop that must never be opened under load.
A simple example
The record is only as useful as its interval and range. The symbol does not show whether peaks are captured or averaged, and a recorder sized for normal load may clip during starting or fault current.
What the drawings help you do
Treat the input as part of the CT secondary loop. Check whether peaks or averages are recorded. A recording ammeter logs current over time; a maximum-demand indicator keeps only the highest averaged value.
This particular reference
Recording instrument that keeps a time record of current, drawn as a square marked A. A recording ammeter logs current over time; a maximum-demand indicator keeps only the highest averaged value.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams
SLD / Schematic · A
What it represents
A recording ammeter logs current against time and is used to study load profiles, motor starting and feeder loading. It is connected in a CT secondary circuit, so like any CT-fed instrument its input forms part of a loop that must never be opened under load.
The record is only as useful as its interval and range. The symbol does not show whether peaks are captured or averaged, and a recorder sized for normal load may clip during starting or fault current.
How to read it
- Treat the input as part of the CT secondary loop.
- Check whether peaks or averages are recorded.
Information to show or reference
- Show CT ratio
- State range and interval
- Provide CT shorting point
A distinction that matters
A recording ammeter logs current over time; a maximum-demand indicator keeps only the highest averaged value.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEC graphical symbols for diagrams
IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced.
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.
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