In a three-phase, four-wire delta system, which color is reserved for identifying the high leg?

In a three-phase, four-wire delta system, the color typically reserved for identifying the high leg is orange. This designation is vital for ensuring safe and correct electrical installations, especially in systems where voltages can differ between phases. The high leg, or the wild leg, carries a higher voltage compared to the other two phases in the delta system, and using a specific color helps electricians and technicians quickly identify and handle this leg appropriately.

The orange color is mandated by many electrical codes in order to promote safety and reduce the risk of accidental contact with the higher voltage leg. This color-coding practice is especially important in commercial and industrial settings, where adherence to electrical standards significantly impacts safety and functionality.

Other colors such as blue, yellow, and gray may represent different phases or neutral connections in various three-phase systems, but they do not indicate the high leg. Hence, understanding the color coding related to the high leg is crucial for anyone working in electrical installations involving three-phase systems.