Transformer wire color codes5/26/2023 ![]() (This is required in NEC article 110.15.) However, these high-leg delta systems are uncommon with newer installations. If the wiring system has one phase at a higher voltage than the others, using a “high-leg” connection, that phase’s wires should be marked with orange. Ground - Green, Green with Yellow Stripe, or Bare Wire. ![]() ![]() These systems are common in home and office environments. In the United States, the following color codes are typically used for power wires in “branch circuits,” the wiring between the last protective device (such as a circuit breaker) and the load (such as a tool or appliance). This way, work will be safer, and future maintenance will be easier. In workplaces, it’s a good idea to document the color code that is being followed. Note that older installations may use different color codes. Which standard should be used in your facility? It depends on your location, installation type, voltage, and other factors. Not all electrical wiring color codes are the same, though, and some even contradict each other. There are many wire identification standards, and many of them rely on color codes.
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