Foundation earthing system

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Foundation earthing system diagram is a graphical representation of how the electrical system of a building or structure is connected to the earth. The purpose of earthing is to protect people from dangerous high voltages and to ensure the proper function of the electrical systems, lightning protection systems, surge protection devices, and electromagnetic compatibility

A foundation earthing system diagram typically consists of the following elements:

  • A grounding electrode system, which is a network of conductive materials that are buried in the ground and provide a low-impedance connection to the earth. The grounding electrodes can be metal underground water pipes, metal in-ground support structures, concrete-encased electrodes, ground rings, or other approved types.
  • A grounding electrode conductor (GEC), which is a wire that connects the grounding electrode system to the main earthing busbar or the neutral bar of the electrical service equipment.
  • A main bonding jumper, which is a conductor that connects the neutral bar to the service equipment enclosure and creates an effective ground-fault current path.
  • An equipment grounding conductor (EGC), which is a wire that connects the exposed metal parts of electrical equipment to the main earthing busbar or the neutral bar and provides a path for fault currents to return to the source.
  • An equipotential bonding conductor (EBC), which is a wire that connects metal parts that are likely to become energized during a fault or lightning strike and reduces potential differences between them.

Here is an example of a foundation earthing system diagram for a building with a concrete-encased electrode.







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