CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
Symbols · HOURS
Running-hours meter
A running-hours meter accumulates elapsed time while its specified enabling condition is active.
SLD / Schematic · HOURS
What it represents
A running-hours meter accumulates elapsed time while its specified enabling condition is active. The schematic must show what condition is counted, such as a running feedback contact or an energised supply.
How to read it
- An energised meter supply and actual machine running are not always the same condition.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- Show enabling contact
- Name counted condition
- Reference reset/retention behaviour
A distinction that matters
A running-hours meter measures duration; an operation counter counts events.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Instrumentation and sensors
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
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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