Other Wiring Codes
Wires may be color-coded to identify their function, voltage class, polarity, phase or to identify the circuit in which they are used. The insulation of the wire may be solidly colored, or where more combinations are needed, one or two tracer stripes may be added. Some wiring color codes are set by national regulations, but often a color code is specific to a manufacturer or industry.
Building wiring under the US National Electrical Code and the Canadian Electrical Code is identified by colors to show energized and neutral conductors, grounding conductors and to identify phases. Other color codes are used in the UK and other areas to identify building wiring or flexible cable wiring.
Thermocouple wires and extension cables are identified by color code for the type of thermocouple; interchanging thermocouples with unsuitable extension wires destroys the accuracy of the measurement.
Automotive wiring is color-coded but standards vary by manufacturer; differing SAE and DIN standards exist.
Modern personal computer peripheral cables and connectors are color coded to simplify connection of speakers, microphones, mice, keyboards and other peripherals, usually according to the PC99 scheme.
A common convention for wiring systems in industrial buildings is; black jacket - AC less than 1000 volts, blue jacket - DC or communications, orange jacket - medium voltage 2300 or 4160 V, red jacket 13,800 volts or higher. Red-jacketed cable is also used for fire alarm wiring, but has a much different appearance, since it operates at relatively low voltages.
Local area network cables may also have jacket colors identifying, for example, process control network vs. office automation networks, or to identify redundant network connections, but these codes vary by organization and facility.
Read more about this topic: Electronic Color Code
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