Single Phase Connections: (Three Phase--see below)
Single Voltage:
Rotation L1 L2
CCW 1,8 4,5
CW 1,5 4,8
Dual Voltage: (Main Winding Only)
Voltage Rotation L1 L2 Join
High CCW 1 4,5 2&3&8
CW 1 4,8 2&3&5
Low CCW 1,3,8 2,4,5 -------
CW 1,3,5 2,4,8 -------
Dual Voltage: (Main & Auxiliary Winding)
Voltage Rotation L1 L2 Join
High CCW 1,8 4,5 2&3,6&7
CW 1,5 4,8 2&3,6&7
Low CCW 1,3,6,8 2,4,5,7 ---------
CW 1,3,5,7 2,4,6,8 ---------
Single Phase Terminal Markings Identified By Color: (NEMA Standards)
1-Blue 5-Black P1-No color assigned
2-White 6-No color assigned P2-Brown
3-Orange 7-No color assigned
4-Yellow 8-Red
Three Phase Connections:
Part Winding Start:
6 Leads NEMA Nomenclature:
WYE or Delta Connected
T1 T2 T3 T7 T8
Motor Leads 1 2 3 7 8
9 Leads NEMA Nomenclature
WYE Connected (low voltage only)
T1 T2 T3 T7 T8
Motor Leads 1 2 3 7 8
12 Leads NEMA & IEC Nomenclature
Single Voltage or Low Voltage of Dual-Voltage Motors
T1 T2 T3 T7 T8
NEMA 1,6 2,4 3,5 7,12 8,10
IEC 1 2 3 7 8
Three Phase Motors-Single Speed
Nema Nomenclature--6 Leads:
Single Voltage--External WYE Connection
L1 L2 L3 Join
1 2 3 4&5&6
Single Voltage--External Delta Connection
L1 L2 L3
1,6 2,4 3,5
Single Voltage WYE-Delta Connections
Connectio
Operating mode n L1 L2 L3 Join
Start WYE 1 2 3 4&5&6
Run Delta 1,6 2,4 3,5 -------
Dual Voltage WYE-Delta Connections
Connectio
Voltage n L1 L2 L3 Join
High WYE 1 2 3 4&5&6
Low Delta 1,6 2,4 3,5 -------
NEMA Nomenclature--9 Leads:
Dual Voltage WYE-Connected
Voltage L1 L2 L3 Join
4&7, 5&8,
High 1 2 3 6&9
Low 1,7 2,8 3,9 4&5&6
Dual Voltage Delta-Connected
Voltage L1 L2 L3 Join
4&7,
High 1 2 3 5&8,6&9
Low 1,6,7 2,4,8 3,5,9 ------------
NEMA Nomenclature--12 Leads:
Dual Voltage--External WYE Connection
Voltage L1 L2 L3 Join
4&7, 5&8,
6&9,
High 1 2 3 10&11&12
4&5&6,
Low 1,7 2,8 3,9 10&11&12
Dual Voltage
WYE-Connected Start
Delta-Connected Run
Voltage Conn. L1 L2 L3 Join
4&7, 5&8,
6&9,
High WYE 1 2 3 10&11&12
4&7, 5&8,
Delta 1,12 2,10 3,11 6&9
4&5&6,
Low WYE 1,7 2,8 3,9 10&11&12
Delta 1,6,7,12 2,4,8,10 3,5,9,11 ------------
IEC Nomenclature--6 & 12 Leads:
Single Voltage WYE-Delta Connections Single Voltage WYE-Delta
Connections
oper-
mode Conn. L1 L2 L3 Join
U2&V2&W2
Start WYE U1 V1 W1
Run Delta U1,W2 V1,U2 W1,V2 --------------
Dual Voltage WYE-Delta Connections
Volt Conn. L1 L2 L3 Join
U2&V2&W2
High WYE U 1 V1 W1
Low Delta U1,W2 V1,U2 W1,V2 --------------
Dual Voltage WYE-Connected Start
Delta-Connected Run
Volt Conn. L1 L2 L3 Join
U2&U5,V2
&V5,
W2&W5,U6
High WYE U 1 V1 W1 &V6&W6
U2&U5,V2
&V5,
Delta U1,W6 V1,U6 W1,V6 W2&W5
U2&V2&W2
,
LOW WYE U1,U5 V1,V5 W1,W5 U6&V6&W6
U1,U5, V1,V5 W1,W5 ----------------
Delta W2,W6 U2,U6 V2,V6 -------------
NEMA Nomenclature--6 Leads:
Constant Torque Connection (Low-speed HP is half of high-speed HP)
Typical
Speed L1 L2 L3
Connectio
Speed L1 L2 L3 n
High 6 4 5 1&2&3Join 2 WYE
4-5-6
Low 1 2 3 Open 1 Delta
Variable Torque Connection (Low-speed HP is 1/4 of high-speed HP)
Typical
Connectio
Speed L1 L2 L3 n
High 6 4 5 1&2&3Join 2 WYE
4-5-6
Low 1 2 3 Open 1 WYE
Constant Horsepower Connection (HP is the same at both speeds)
Typical
Connectio
Speed L1 L2 L3 n
High 6 4 5 1-2-3 Open 1 Delta
4&5&6-
Low 1 2 3 Join 2 WYE
IEC Nomenclature--6 Leads:
Constant Torque Connection
Typical
Connectio
Speed L1 L2 L3 n
1U&1V&1W
High 2W 2U 2V --JOIN 2 WYE
2U-2V-2W
Low 1U 1V 1W OPEN 1 Delta
Variable Torque Connection
Typical
Connectio
Speed L1 L2 L3 n
1U&1V&1W
High 2W 2U 2V --JOIN 2 WYE
2U-2V-2W
Low 1U 1V 1W OPEN 1 WYE
T9
9
T9 Together
9 4&5&6
T9
9,11
9
e WYE-Delta
P)
