Ace the HVAC NATE Heat Pump Challenge 2025 – Power On Your Expertise!

In a 3-phase system, the voltage measured between any two hot legs is determined by the configuration of the system. In a typical 3-phase 240V distribution panel, the voltage between any two of the three hot legs is indeed 240V.

This is because 240V is the nominal voltage for a 3-phase system that uses a winding configuration designed to deliver that voltage level. The three hot legs in such a setup are 120 degrees out of phase with each other, and when measuring across any two hot legs, the resulting voltage is maintained at the standard level of 240V.

Other voltage options are in reference to different common configurations or phases in electrical systems. For example, 208V is common in a wye-configuration with a 120/208V system, which is not the case here. The 480V option refers to a higher voltage system, typically used in larger industrial applications. Thus, understanding the specific voltages associated with the configuration is essential for accurately assessing the voltage readings in a 3-phase panel.