A circle enclosing a three-bar earth glyph — IEC 60417-5019, marking the protective earth (ground) terminal on Class I equipment.
Also known as: Protective earth symbol, Ground symbol, Earth terminal symbol, IEC 60417-5019, PE symbol
Identifies the protective earth terminal: the connection that carries fault current safely to earth on Class I equipment. Its presence signals a fundamentally different shock-protection strategy from the Class II double-square symbol.
Identifies the protective earth terminal on Class I equipment — the terminal that must be connected to the installation's earth so that a fault cannot leave exposed metal live.
Contexts: Electrical equipment
A circle containing a short vertical stem that meets three horizontal bars of decreasing length, the longest at the top — the conventional earthing glyph.
Opposite protection strategies: this marks the earth terminal that must be connected, while the double square means the appliance is insulated well enough not to need one.