On a 4 wire delta connected phase system with a grounded midpoint, how must the conductor with the higher phase voltage be marked?

In a 4-wire delta-connected system with a grounded midpoint, the conductors are often color-coded to indicate their phases and other important characteristics for safety and clarity in electrical installations. The conductor with the higher phase voltage in this system is typically marked in a manner that distinguishes it from the other conductors.

The color orange is commonly used to signify that particular conductor in systems adhering to color coding standards, such as the National Electrical Code (NEC) and electrical industry practices. This color coding helps electricians and technicians quickly identify which wire corresponds to which phase voltage. Correct identification is imperative for ensuring safety when performing maintenance or troubleshooting tasks.

By marking the higher phase voltage conductor in orange, it ensures that anyone working on the system can immediately recognize the potential hazards associated with that phase, fostering safer work practices. The use of orange for this purpose is consistent with various guidelines used in electrical installations. Thus, it is essential to follow this standard to maintain consistency and safety in electrical work.