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Electricity and electronics

Reference

Symbol

Name

Definition

Note

IEC 60878 5005

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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

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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

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Direct current

To indicate on the rating plate that the equipment is suitable for direct current only; to identify relevant terminals

IEC 60878 5021

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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

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Output

To identify an output terminal when it is necessary to distinguish between inputs and outputs

IEC 60878 5448

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Input/Output

To identify a combined input/output connector or mode

IEC 60878 5134

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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

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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

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Input

To identify an input terminal when it is necessary to distinguish between inputs and outputs.

IEC 60417 5003

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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

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