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The wye configurations and the delta configurations are the most common generator lead connections. The following three-phase connection diagrams illustrate the proper connection and lead identification for Wye configurations and Delta configurations. Four Lead Wye Connection
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Four Lead Wye Connection Diagram
Table 1
FOUR LEAD WYE CONNECTIONS    
Generator Lead     Line Lead     Regulator Lead    
T1     T1     22    
T2     T2     24    
T3     T3     20    
T0     Neutral     -    Six Lead Wye Connection
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Six Lead Wye Connection Diagram
Table 2
SIX LEAD WYE CONNECTIONS    
Generator Lead     Line Lead     Regulator Lead (1)    
T1     T1     22    
T2     T2     24    
T3     T3     20    
Connect T4, T5, and T6     Neutral     -    
( 1 ) Regulator leads are used on Generator sets with a 3500B Engine. On PMPE generators, sensing isolation transformers are used. The line lead's voltage connects to one side of the sensing isolation transformer. The voltage regulator connects to the other side of the sensing isolation transformer. On SE generators, the stator windings are tapped in order to supply sensing voltage to the regulator.Ten Lead Wye Connection (High Voltage)
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Ten Lead Wye Connection Diagram (High Voltage)
Table 3
TEN LEAD WYE CONNECTIONS (HIGH VOLTAGE)    
Generator Lead     Line Lead     Regulator Lead    
T1     T1     -    
Connect T4 and T7     -     22    
T2     T2     -    
Connect T5 and T8     -     24    
T3     T3     -    
Connect T6, T9     -     20    
T0     Neutral     -    Ten Lead Wye Connection (Low Voltage)
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Ten Lead Wye Connection Diagram (Low Voltage)
Table 4
TEN LEAD WYE CONNECTIONS (LOW VOLTAGE)    
Generator Lead     Line Lead     Regulator Lead    
Connect T1 and T7     T1     22    
Connect T2 and T8     T2     24    
Connect T3 and T9     T3     20    
Connect T4, T5, T6, and T0     Neutral     -    Twelve Lead Wye Connection (High Voltage)
Illustration 5 g01027757
Table 5
TWELVE LEAD WYE CONNECTIONS (HIGH VOLTAGE)    
Generator Lead     Line Lead     Regulator Load    
T1     T1     -    
Connect T4 and T7     -     22    
T2     T2     -    
Connect T5 and T8     -     24    
T3     T3     -    
Connect T6 and T9     -     20    
Connect T10, T11, and T12     Neutral     -    Twelve Lead Wye Connection (Low Voltage)
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Twelve Lead Wye Connection Diagram (Low Voltage)
Table 6
TWELVE LEAD WYE CONNECTIONS (LOW VOLTAGE)    
Generator Lead     Line Lead     Regulator Lead    
Connect T1 and T7     T1     22    
Connect T2 and T8     T2     24    
Connect T3 and T9     T3     20    
Connect T4, T5, T6, T10, T11, and T12     Neutral     -    Twelve Lead Delta Connection
Illustration 7 g00611504
Twelve Lead Delta Connection Diagram
Table 7
TWELVE LEAD