4
Symbols
Equipment protected throughout by double insulation or reinforced
insulation.
Functional earth (ground) terminal, to enable the product to function
correctly.
Not used to provide electrical safety.
Clean earth / ground.
Safety earth.
Caution, risk of electric shock.
Caution, risk of danger, refer to accompanying documentation.
Optically isolated current source or sink.
Caution, Electrostatic Discharge (ESD) sensitive circuit. Do not touch
or handle without proper electrostatic discharge precautions.
ac, alternating current.
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