Which color code is used to identify the ungrounded conductor with the higher voltage to ground in a 240/120 delta four-wire system?

• A. Orange
• B. Red
• C. Blue
• D. Yellow

Answer: (A)

In a 240/120 high-leg delta four-wire system, one of the three ungrounded conductors reaches a higher voltage to ground than the other two. That “high leg” is identified with orange color to warn installers that its voltage-to-ground is different (about 208 V) compared with the other two legs, which are 120 V to neutral. The orange marking follows NEC conventions for the high leg delta, making it clear which conductor should not be used for standard 120 V loads or neutrals. The two remaining ungrounded conductors carry 120 V to neutral, while the high leg carries the higher voltage to ground, so orange is the correct color identifier.