DOE-HDBK-1016/1-93Electrical Diagrams and SchematicsELECTRICAL DIAGRAMS AND SCHEMATICSOn the primary side of the transformer the dot indicates current in; on the secondary side the dotindicates current out.If at a given instant the current is flowing into the transformer at the dotted end of the primarycoil, it will be flowing out of the transformer at the dotted end of the secondary coil. The currentflow for a transformer using the dot symbology is illustrated in Figure 2.SwitchesFigure 3 shows the most common types of switches and their symbols. The term "pole," as usedto describe the switches in Figure 3, refers to the number of points at which current can entera switch. Single pole and double pole switches are shown, but a switch may have as many polesas it requires to perform its function. The term "throw" used in Figure 3 refers to the numberof circuits that each pole of a switch can complete or control. Figure 3 Switches and Switch SymbolsRev. 0PR-03Page 3
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