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Common circuit diagram symbols (US ANSI symbols) An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may ...
In legacy on-premises wiring the first, or only, pair of inside wiring and jacks is color-coded in green for the tip conductor and red for the ring side. A second pair is coded in black for tip and yellow for ring. A third pair consists of white tip coding and blue ring coding.