According the external influences which electrical equipment sustain, following symbols
are used:
Table 7.2.SAFETY SYMBOLS AND SAFETY IDENTIFICATION FOR USE ELECTRICAL EQUIPMENT
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7.2.2 Graphical symbols for external influences
symbol used electrical equipment protection which provided by
enclosures
(IP Code) 21
symbol used equipment protected against humidity
symbol used equipment designed for outdoor conditions
symbol used sealed equipment
symbol used sealed closed equipment
symbol used for water tight equipment
. This symbol marks the
equipment Class which except for live conductors connected the
protective conductor (PE) the system
This symbol, usually situated the enclosure the electrical equipment, marks
the equipment Class II.2. Graphical symbols for use electrical equipment
According the way connection electrical equipment the electrical system,
following symbols are used:
Table 7. This equipment designed only for supply safety
extra low voltage (SELV). This equipment shall only connected the live
conductors the system and not provided (but for exceptional cases) with the
terminal for protective conductor
This symbol, usually situated the enclosure the electrical equipment, marks
the equipment Class III.1 Graphical symbols for Class Class and Class III
This symbol situated the terminal near the terminal for connection of
equipment the protective conductor the system
