Electrical System Configuration: Understanding 120/240 Volts, 3 Phase, 4 Wire Delta Connection

What is the potential between Line 2 (L2) and neutral or ground in a 120/240 volts, 3-phase, 4-wire delta connection?

A. 120 volts

B. 208 volts

C. 240 volts

Answer:

The potential between Line 2 (L2) and the neutral or ground in a 120/240 volts, 3-phase, 4-wire delta connection is 208 volts.

When dealing with a 120/240 volts, 3-phase, 4-wire delta electrical connection, it is important to note that the potential between Line 2 (L2) and the neutral or ground is 208 volts, not 120 volts as some might expect. This is due to the unique characteristics of the delta configuration.

In this electrical system setup, Line 1 (L1) and Line 3 (L3) both have a potential of 120 volts in relation to neutral or ground, which is formed by the center tap of the transformer. However, Line 2 (L2) is known as the 'high' or 'wild' leg of the delta transformer, resulting in a potential difference of 208 volts to the neutral or ground.

It is crucial to understand that although the potential between L2 and another line (L1 or L3) will show 240 volts, the voltage between any two lines (L1, L2, L3) in the 3-phase, 4-wire delta configuration is always equal to the system voltage, which is 240 volts in this case. But specifically, L2 to neutral/ground is 208 volts.

By grasping these nuances in electrical system configurations, you can ensure proper understanding and safe handling of power systems. If you want to delve deeper into Electrical System Configuration and related topics, feel free to explore more resources and tutorials on the subject.