For a 240 3-phase 3-wire system, which connection is required?

In a 240 3-phase 3-wire system, a Delta connection is the appropriate choice for a few key reasons related to its operational characteristics.

A Delta connection is commonly used in 3-phase systems when you need to ensure a balanced load distribution and allow for higher voltage levels to be utilized on the line conductors. This configuration is effective for systems that require a phase-to-phase voltage, which in this case is 240 volts. The arrangement of three coils connected in a triangular loop provides a continuous path for current to flow, which is advantageous for motor applications and heavy load demands typically associated with industrial settings.

One of the primary benefits of a Delta connection is that it does not require a neutral wire. In a 3-phase 3-wire system like this one, the absence of a neutral simplifies the wiring, making installation easier and often more cost-effective. Additionally, since all three phases carry equal loads, the system can operate efficiently without the problems associated with uneven distribution of power.

In summary, the choice of a Delta connection for a 240 3-phase 3-wire system is primarily because it effectively manages phase-to-phase voltage, supports heavy loads, and simplifies the system without the need for a neutral conductor.