PIR
Intruder motion detector plan symbol
Security plan symbol for a passive infrared or dual-technology motion detector reporting to an intruder alarm.
IEC
IEC · DC
Door contact plan symbol
Security plan symbol for a magnetic contact that signals whether a door or window is open.
In plain English
What does Door contact plan mean?
Magnetic door contacts use a reed switch on the frame and a magnet on the door. Security plans draw a small pair of rectangles or a contact mark at the door head, tagged DC, with the zone number.
A simple example
Door contacts are used both for intruder alarm and for access control door monitoring, where they detect forced or held-open doors. The plan should state which system or both. The symbol does not tell you whether the contact is surface or flush, or high-security balanced type.
What the drawings help you do
Check which system receives the signal. Check surface or flush type in schedule. A limit switch in machine control detects mechanical position; a door contact is a security monitoring device.
This particular reference
Security plan symbol for a magnetic contact that signals whether a door or window is open. A limit switch in machine control detects mechanical position; a door contact is a security monitoring device.
- DC
- Direct current: electricity flowing in one direction.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEC graphical symbols for diagrams · Electrical installation design methodology and references
IEC · Door contact
IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
GA · DC
What it represents
Magnetic door contacts use a reed switch on the frame and a magnet on the door. Security plans draw a small pair of rectangles or a contact mark at the door head, tagged DC, with the zone number.
Door contacts are used both for intruder alarm and for access control door monitoring, where they detect forced or held-open doors. The plan should state which system or both. The symbol does not tell you whether the contact is surface or flush, or high-security balanced type.
How to read it
- Check which system receives the signal.
- Check surface or flush type in schedule.
Information to show or reference
- Tag zone or door number.
- State contact type.
- Coordinate with door hardware.
A distinction that matters
A limit switch in machine control detects mechanical position; a door contact is a security monitoring device.
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 graphical symbol context for installation and communication plans; independently drawn here.
Electrical installation design methodology and references
Installation design context for coordinating low-current systems with power and lighting.
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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