Industrial Wiring Color Code

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Industrial wiring color code. Machine builders and industrial electrical standard insulation wire color code for most industrial plants. The common color code for three phase in on or behind the wall electrical wiring is shown below. Yellow 120 vac from an outside power source. Wiring colour codes the colour codes used in the past were originally determined by the british standard regulations bs 7671 but these standards were set down before complex automated systems were.

In principle any other colors except these may be used for the power conductors. When are color codes applied to wiring. You must use the color green with or without one or more yellow stripes to identify the equipment grounding conductor where insulated or covered. The national electrical code nec says that white or gray must be used for neutral conductors and that bare copper or green wires must be used as ground wires.

Ground ground wiring should be green or green with a yellow stripe. Neutral neutral wires should be grey. Red 120 vac control cicuit. In fact for industrial machinery color coding can serve an array of purposes.

Beyond that are general industry accepted rules about wire color that indicate their purpose. International and european standards require the use of a bicolor green and yellow for this purpose see iec 204 1 for specific requirements. In three phase power supply the combination of black red and blue wires for power conductors are used for 120 240v ac whereas the combination of brown orange and yellow wires for power conductors are used for 277 480 v ac. Wiring color code standards are set in place by the canadian electric code or cec in canada.

There is no guarantee written or implied regarding the accuracy of the information provided. Blue dc control wire 24vdc to 120vdc. Phase 2 phase 2 wiring should be orange. Icea method 1 e2 k 2 for industrial cables the information provided in the resources section is intended for reference only.

Phase 1 phase 1 wiring should be brown. For example for the identification of conductors black is used for ungrounded ac and dc power conductors red for ungrounded ac control conductors and blue for ungrounded dc conductors in accordance with nfpa 79 2018. The colors adopted as local practice are shown in table below. Phase 3 phase 3 wiring should be yellow.

Phase 1 red phase 2 black phase 3 blue neutral white ground green with yellow stripe. The color code is very similar to the u s a s color code.