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

MET

IEC

Main earthing terminal

The main earthing terminal is the hub of an installation's earthing. Installation guidance describes it as the point that provides the main equipotential connection, with the earthing conductor to the electrode, main bonding conductors to metallic services and protective conductors to circuits all landed on it. Earthing schematics draw it as a bar with labelled connections.

Drawing use: SLD / Schematic
Application: Connections & wiring
Reference family: IEC
Form evidence: Main earthing terminal. Independent IEC-context illustration; not certified IEC geometry.

A distinction that matters

The main earthing terminal is the installation's earthing hub; a protective-earth terminal block is a single terminal in a panel.

Full reference

IEC

Removable earth test link

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.

Drawing use: SLD / Schematic
Application: Connections & wiring
Reference family: IEC
Form evidence: Removable earthing link. Independent IEC-context illustration; not certified IEC geometry.

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.

Full reference

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