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For power circuits, the color-coding uses the same colors as residential construction, and adds the additional wires used for three-phase systems. Black, Red and Blue are used for hot wires and White is used as the neutral wire in a 120/208 V circuit. Brown, Orange and Yellow are used as hot wires and gray is used as the neutral wire in a 277/ ...
colorless, yellow or brown (hot) gray and opaque Barium: colorless: Bismuth: colorless, yellow or brownish (hot) gray and opaque Cadmium: colorless: gray and opaque Calcium: colorless: Cerium: red (hot) colorless (hot and cold) Chromium: dark yellow (hot), green (cold) green (hot and cold) Cobalt: blue (hot and cold) blue (hot and cold) Copper ...
In fixed wiring, the blue/brown scheme is only found in newer (post-2004) installations, and the old IEE red/black scheme is likely to be encountered in existing installations for many more decades. Earlier in the 20th century, green and blue were used as a neutral alongside black, which became the only neutral colour from 1943.
However, it is a common misconception that "hot" conductor colour-coding is required by the Code. In the United States, colour-coding of three-phase system conductors follows a de facto standard, wherein black, red, and blue are used for three-phase 120/208-volt systems, and brown, orange or violet, and yellow are used in 277/480-volt systems.
Brown colors are dark or muted shades of reds, oranges, and yellows. Browns are sometimes by mixing two complementary colors from the RYB model (combining all three primary colors). In theory, such combinations should produce black, but in practice (because of non-ideal pigments), they do not.
Dramatic, rich tones that will work in large and small spaces throughout your home.
NEMA L14 are three-pole and ground connectors rated for 125/250 V. Intended for three-pole, four-wire hot-hot-neutral-ground circuits with a nominal supply voltages of 240 or 208 V hot-to-hot and 120 V hot-to-neutral. These connectors are common on household backup generators, and on racks of power amplifiers in large audio systems.
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