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international regulations. Table 1 defines the symbols and markings you
may find in a manual or on an instrument.
Table 1 Safety symbols and instrument markings
Safety symbols
Warning: risk of electric shock.
Warning: hot surface
Caution: refer to accompanying documents.
Laser radiation symbol: marked on products that have a laser output.
Alternating current.
Both direct and alternating current.
Three-phase alternating current.
Earth (ground) terminal
Protective earth (ground) terminal
Frame or chassis terminal
Terminal is at earth potential. Used for measurement and control circuits designed to
be operated with one terminal at earth potential.
Terminal for neutral conductor on permanently installed equipment.
Terminal for line conductor on permanently installed equipment.
Standby (supply); units with this symbol are not completely disconnected from ac
mains when this switch is off. To completely disconnect the unit from ac mains, either
disconnect the power cord, or have a qualified electrician install an external switch.
Instrument markings
The CE mark is a registered trademark of the European Community. If it is
accompanied by a year, it indicates the year the design was proven.
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