INFICON Cygnus Thin Film Deposition Controller - Manual (Page 18)

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Cygnus Operating Manual
1.2.3 Earth Ground
Cygnus is connected to earth ground through a sealed three-core
(three-conductor) power cable, which must be plugged into a socket outlet with a
protective earth terminal. Extension cables must always have three conductors
including a protective earth terminal.
WARNING - Risk Of Electric Shock
Never interrupt the protective earth circuit.
Any interruption of the protective earth circuit inside or
outside the instrument, or disconnection of the
protective earth terminal is likely to make the instrument
dangerous.
This symbol indicates where the protective earth ground
is connected inside the instrument. Never unscrew or
loosen this connection.