MET
Main earthing terminal
The terminal or bar where protective conductors, bonding conductors and the earthing conductor of an installation meet.
IEC
IEC · E
Removable earth test link
A removable link between the main earthing terminal and the earth electrode, opened to measure electrode resistance.
In plain English
What does Removable earth test link mean?
The earth test link sits in the earthing conductor between the main earthing terminal and the earth electrode. Removing it isolates the electrode so its resistance can be measured on its own. Installation guidance describes it as part of the earthing arrangement at the main earthing terminal.
A simple example
The link must be replaced after testing, and the installation is not adequately earthed while it is open. The symbol does not tell you whether other earth paths exist in parallel, such as the supply earth, which would affect test readings and safety during the test.
What the drawings help you do
Check for parallel earth paths that affect electrode testing. Confirm the link is restored after testing. An earth test link is removed only for electrode testing; a neutral-to-earth link bonds neutral and earth in service.
This particular reference
A removable link between the main earthing terminal and the earth electrode, opened to measure electrode resistance. An earth test link is removed only for electrode testing; a neutral-to-earth link bonds neutral and earth in service.
- Terminal
- An identified point where a conductor connects.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Earthing connections · AutoCAD Electrical: Earthing, sources and surge protection
IEC · Removable earthing link
Independent IEC-context illustration; not certified IEC geometry.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
SLD / Schematic · E
What it represents
The earth test link sits in the earthing conductor between the main earthing terminal and the earth electrode. Removing it isolates the electrode so its resistance can be measured on its own. Installation guidance describes it as part of the earthing arrangement at the main earthing terminal.
The link must be replaced after testing, and the installation is not adequately earthed while it is open. The symbol does not tell you whether other earth paths exist in parallel, such as the supply earth, which would affect test readings and safety during the test.
How to read it
- Check for parallel earth paths that affect electrode testing.
- Confirm the link is restored after testing.
Information to show or reference
- Show the link between MET and electrode.
- Label it for testing.
- Note any parallel earth paths.
A distinction that matters
An earth test link is removed only for electrode testing; a neutral-to-earth link bonds neutral and earth in service.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Earthing connections
Public installation-guide definition of the removable link used to check earth-electrode resistance.
AutoCAD Electrical: Earthing, sources and surge protection
Public IEC-oriented earth 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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