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Frame or chassis connection
A connection to the metal frame or chassis of equipment, which may or may not itself be connected to earth.
IEC
IEEE / ANSI · -
ANSI/IEEE chassis ground symbol
IEEE-oriented chassis or frame ground drawn as a line ending in angled strokes, used for equipment frame returns.
In plain English
What does ANSI/IEEE chassis ground mean?
US-practice electronics and control schematics show chassis ground as a line ending in a horizontal bar with angled strokes beneath it. It identifies a connection to the equipment frame and is often used for screen terminations and filter returns inside an enclosure.
A simple example
This illustration is an independent explanation, not the IEEE graphic. As with the IEC frame connection, chassis ground is not proof that the frame is connected to earth ground. Safety grounding should be shown with the protective ground symbol.
What the drawings help you do
Do not treat chassis ground as earth ground without a separate bond. Look for screen terminations on chassis grounds. Chassis ground ties to the frame; earth ground ties to the grounding electrode system.
This particular reference
IEEE-oriented chassis or frame ground drawn as a line ending in angled strokes, used for equipment frame returns. Chassis ground ties to the frame; earth ground ties to the grounding electrode system.
- Terminal
- An identified point where a conductor connects.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams · Autodesk IEEE Symbol Preview — Miscellaneous
IEEE / ANSI · Chassis ground form
Independent illustration in IEEE drafting context; no equivalence of every detailed standard graphic is asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · -
What it represents
US-practice electronics and control schematics show chassis ground as a line ending in a horizontal bar with angled strokes beneath it. It identifies a connection to the equipment frame and is often used for screen terminations and filter returns inside an enclosure.
This illustration is an independent explanation, not the IEEE graphic. As with the IEC frame connection, chassis ground is not proof that the frame is connected to earth ground. Safety grounding should be shown with the protective ground symbol.
How to read it
- Do not treat chassis ground as earth ground without a separate bond.
- Look for screen terminations on chassis grounds.
Information to show or reference
- Show the bond between chassis and earth ground.
- Keep chassis and signal commons distinct.
- Identify chassis stud locations.
A distinction that matters
Chassis ground ties to the frame; earth ground ties to the grounding electrode system.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
Graphic-symbol standards context and official status; not a source of reproduced artwork.
Autodesk IEEE Symbol Preview — Miscellaneous
Public IEEE-oriented earth and ground forms.
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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