If 120-volt loads are required to be connected to a delta transformer, what must be implemented to provide two 120-volt outputs?

To achieve two 120-volt outputs from a delta transformer, a center-tap configuration is essential. The center tap serves as a neutral point, allowing for the creation of two equal voltage outputs from a single phase of the transformer. In the case of a delta transformer, which typically provides three-phase power, the center-tap would be connected to the midpoint of one of the phase windings.

This arrangement splits the phase voltage in such a way that you can draw 120 volts from the center tap to one phase and 120 volts from the center tap to another phase, effectively providing two 120-volt outputs. This method is commonly used in residential and light commercial applications to power standard appliances and lighting that operate on 120 volts.

Other methods, like series or parallel connections, do not function effectively for this scenario. Series connections would increase the voltage rather than provide two separate 120-volt outputs, and parallel connections are used to increase current capacity rather than create separate voltage outputs. A single-phase output would not apply here either, as it does not pertain to the usage of a delta configuration where three-phase power is involved.