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3 earth ground, Warning - risk of electric shock – INFICON IC6 Thin Film Deposition Controller User Manual

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IC6 Operating Manual

1.2.3 Earth Ground

The IC6 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 IC6, or disconnection of the protective earth
terminal is likely to make the IC6 dangerous.

This symbol indicates where the protective earth ground
is connected inside the IC6. Never unscrew or loosen this
connection.