What Is Functional Earth?

A functional earth connection is provided to support the correct operation of electrical or electronic equipment. It may be used for purposes such as electromagnetic compatibility, interference reduction, signal reference or other functional requirements.

Unlike protective earth, functional earth is not primarily intended to protect users against electric shock.

When Is the Functional Earth Symbol Used?

The symbol can be used to identify a terminal or connection intended specifically for functional earthing. Whether such a connection is required depends on the design and intended operation of the equipment.

It should not be used to identify a protective earth terminal where the connection performs a safety function.

Functional Earth vs Protective Earth

Functional earth and protective earth have different purposes. Protective earth is a safety connection designed to provide protection against electric shock, while functional earth supports the operation or performance of the equipment.

Using the correct symbol is therefore important when identifying terminals and connections.

You Might Also Need These Symbols

Depending on the electrical design of your product, you may also need the Protective Earth, Class I Appliance or Class II Double Insulated symbols. View our Electronics Symbols page for other electrical safety and equipment markings.

Download

Download the functional earth symbol below in SVG, PNG and PDF format.

functional-earth-symbol.pngfunctional-earth-symbol.svgfunctional-earth-symbol.pdf

Use the symbol only for connections intended for functional earthing. Do not use it as a substitute for the protective earth symbol.

Looking for another electrical marking? View all electronics symbols.