11Center-Tapped Transformers and Secondaries
The standard method of providing three-wire service to a customer is from a center-tapped single-phase transformer. This type of service provides the customer with two 120-V circuits and one 240-V circuit. Two types of transformers are available for providing this service. The first is where the secondary consists of one winding that is center-tapped as shown in Figure 11.1.
The secondary voltage rating of the transformer in Figure 11.1 would be specified as 240/120 V. This specifies that the full winding voltage rating is 240 V, with the center tap providing two 120-V circuits.
A second type of transformer used to provide three-wire service is shown in Figure 11.2.
The transformer in Figure 11.2 ...
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