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Electricity and electronics

Reference
Symbol
Name
Definition
Note
IEC 60878 5005
5005
Plus; positive polarity
To identify the positive terminal(s) of equipment which is used with, or generates direct current
Note – The meaning of this graphical symbol depends upon its orientation.
IEC 60878 5006
5006
Minus; negative polarity
To identify the negative terminal(s) of equipment which is used with, or generates direct current
Note – The meaning of this graphical symbol depends upon its orientation.
IEC 60878 5031
5031
Direct current
To indicate on the rating plate that the equipment is suitable for direct current only; to identify relevant terminals
IEC 60878 5021
5021
Equipotentiality
To identify the terminals which, when connected together, bring the various parts of an equipment or of a system to the same potential, not necessarily being the earth (ground) potential, e.g. for local bonding.
IEC 60878 5035
5035
Output
To identify an output terminal when it is necessary to distinguish between inputs and outputs
IEC 60878 5448
5448
Input/Output
To identify a combined input/output connector or mode
IEC 60878 5134
5134
Electrostatic sensitive devices
To indicate packages containing electrostatic sensitive devices, or to identify a device or a connector that has not been tested for immunity to electrostatic discharge
IEC 60878 5140
5140
Non-ionizing electromagnetic radiation
To indicate generally elevated, potentially hazardous, levels of non-ionizing radiation, or to indicate equipment or systems e.g. in the medical electrical area that include RF transmitters or that intentionally apply RF electromagnetic energy for diagnosis or treatment
IEC 60878 5034
5034
Input
To identify an input terminal when it is necessary to distinguish between inputs and outputs.
IEC 60417 5003
5003
AC/DC converter; rectifier; substitute power supply
To identify an AC/DC-converter and, in case of plug-in devices, to identify the relevant receptacles.
IEC60878 5032
ac symbol
Alternating current
To indicate on the rating plate that the equipment is suitable for alternating current only; to identify relevant terminals