Additional configurations such as high leg open delta with two transformers, delta with no neutral, delta with no ground or grounded delta are also used but we will stick to the Star (Wye) and Delta connection based on panel wiring needed in our case. High leg delta configuration can also be used for 240, 415 & 480V supply systems. Related Post: How to Wire 277V & 480V, 1-Phase & 3-Phase, Commercial Main Service Panel?.You may know more about the comparison and differences between Star-Delta (Wye-Delta) connection with advantages and disadvantages. neutral wire may be needed for three phase 240V outlets etc. These are the general setup and may vary and depend on the installation e.g. Voltage between three Phases = 240V (3-Φ).Voltage between two Hot Phases = 120V x 2 = 240V (1-Φ).Voltage between High leg and Neutral = 1/2 x 220V x √3 = 208V (1-Φ). ![]() Voltage between Phase and Neutral = 1/2 x 240V = 220V (1-Φ).To get all these values, you may use the following simple math calculations (Phase, Lines and Hot represents the same thing). 240V Three Phase, 4 Wires (Three out of phase Hot wires (one is High Leg delta) + Ground wire).240V Single Phase, 3 Wires (Two out of phase Hot wires + Ground wire).208V Single Phase, 3 Wires (One Hot Wire from High Leg Delta + Neutral wire + Ground wire).120V Single Phase, 3 Wires (One Hot wire + Neutral wire + Ground Wire).In this kind of power distribution configuration, the following different levels of voltage are available across three wires + neutral from the commercial transformers. The transformers then reduce the level of voltage to the desired 240V, 208V and 120V applicable to the commercial buildings and industrial installations. The primary side of these three step-down transformers are connected to the 4.5k-7.2kV supply. In addition, High leg delta is not recommended if you are only interested in the 208V system as you can achieve it by Wye-Wye, three phase four wire system which provides 120V & 208V, single and three phase supply.įor high Leg delta supply, the electric power supply company installs three transformers to provide 120V, 208V and 240V (1 & 3 Phase) supply voltage levels based on the end user requirement. Utilities require the High Leg conductor in meters and box be located on the “C” Phase.The High Leg Must Terminate on the “B” Phase.Also, use the Orange color for high leg delta hot busbar (now phase “C”, previously Phase “B” – prior NEC-2008″. Good to know: Other names used for High Leg Delta: Wild Leg, High Leg, Power Leg, Dog Leg, Orange Leg, Red Leg, Stinger Leg, Bustard Leg. How to Wire 208V & 120V, 1-Phase & 3-Phase Main Panel?.How to Wire 120V & 240V Main Panel? Breaker Box Installation. ![]() The overall wires enters to the commercial panel in still three hot including high leg delta and one neutral wire.
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