Industrial Wiring Color Code

Phase 2 phase 2 wiring should be orange.

Industrial wiring color code. Blue dc control wire 24vdc to 120vdc. When are color codes applied to wiring. The us national electrical code only mandates white or grey for the neutral power conductor and bare copper green or green with yellow stripe for the protective ground. International and european standards require the use of a bicolor green and yellow for this purpose see iec 204 1 for specific requirements.

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. Red 120 vac control cicuit. The manufacturer of most narrow wires will color code them utilizing insulation of different colors. Phase 1 red phase 2 black phase 3 blue neutral white ground green with yellow stripe.

The common color code for three phase in on or behind the wall electrical wiring is shown below. In fact for industrial machinery color coding can serve an array of purposes. Icea method 1 e2 k 2 for industrial cables the information provided in the resources section is intended for reference only. 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.

Yellow 120 vac from an outside power source. Phase 3 phase 3 wiring should be yellow. There is no guarantee written or implied regarding the accuracy of the information provided. The color code is very similar to the u s a s color code.

In principle any other colors except these may be used for the power conductors. Ground ground wiring should be green or green with a yellow stripe. These are the wire color coding standards that are used in the united states. 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. The spruce 2018. Neutral neutral wires should be grey. You must use the color green with or without one or more yellow stripes to identify the equipment grounding conductor where insulated or covered.

Phase 1 phase 1 wiring should be brown. The colors adopted as local practice are shown in table below.