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Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Appendix C Earthing and Bonding Recommendations
EC [3] Definitions
EC [3] Definitions
The following definitions apply to terminology found in IEC 50 [3]:
Earth The conductive mass of the earth, whose electric potential at any
point is conventionally taken as equal to zero. In some countries
the word “ground” is used instead of “earth.”
Earth electrode A conductive part or a group of conductive parts in intimate
contact with and providing an electrical connection to earth.
Earthing network The part of an earthing installation that is restricted to the earth
electrodes and their interconnections.
Main earthing terminal A terminal or bar that is provided for the connection of
protective conductors, including equipotential bonding
conductors and conductors for functional earthing, if any, to the
means of earthing.
Earthing conductor A protective conductor that connects the main earthing terminal
or bar to the earth electrode.
Equipotential bonding Electrical connection putting various exposed conductive parts
and extraneous conductive parts at a substantially equal
potential.
Equipotential bonding conductor A protective conductor for ensuring equipotential bonding.
Neutral conductor (N) A conductor that is connected to the neutral point of a system
and capable of contributing to the transmission of electrical
energy.
Protective conductor (PE) A conductor that is required by some measures for protection
against electric shock by electrically connecting any of the
following parts:
• Exposed conductive parts
• Extraneous conductive parts
• Main earthing terminal
• Earth electrode
• Earthed point of the source or artificial neutral