Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEC

Door contact plan symbol

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.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Door contact. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A limit switch in machine control detects mechanical position; a door contact is a security monitoring device.

Full reference

PIR

IEC

Intruder motion detector plan symbol

Intruder motion detectors sense movement, usually by passive infrared, sometimes combined with microwave. Security plans draw a small box or semicircle at the corner mounting position with the detection fan drawn into the room so coverage can be checked.

Drawing use: GA
Application: Installation & communications
Reference family: IEC
Form evidence: Motion detector, intruder alarm. IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier.

A distinction that matters

A lighting presence detector switches luminaires; this detector reports to an intruder alarm system.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.