Terminal Markings and Connections
Three-Phase Motors-Single Speed
NEMA Nomenclature – 6 Leads
| Single Voltage
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| Single Voltage
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Single and Dual Voltage
WYE-DELTA Connections
Single Voltage
| Operating Mode | Connection | L1 | L2 | L3 | Join |
| Start | WYE | 1 | 2 | 3 | 4 & 5 & 6 |
| Run | DELTA | 1, 6 | 2, 4 | 3, 5 | – – – |
Dual Voltage*
| Voltage | Connection | L1 | L2 | L3 | Join |
| High | WYE | 1 | 2 | 3 | 4 & 5 & 6 |
| Low | DELTA | 1, 6 | 2, 4 | 3, 5 | – – – |
*Voltage Ratio: 1.732 to 1.
Terminal Markings and Connections
Three-Phase Motors-Single Speed
NEMA Nomenclature – 9 Leads
Dual Voltage
WYE-Connected
| Voltage | L1 | L2 | L3 | Join |
| High | 1 | 2 | 3 | 4 & 7, 5 & 8, 6 & 9 |
| Low | 1, 7 | 2, 8 | 3, 9 | 4 & 5 & 6 |
Dual Voltage
DELTA-Connected
| Voltage | L1 | L2 | L3 | Join |
| High | 1 | 2 | 3 | 4 & 7, 5 & 8, 6 & 9 |
| Low | 1, 6, | 2, | 3, | – – – |
Terminal Markings and Connections
Three-Phase Motors-Single Speed
NEMA Nomenclature – 12 Leads
Dual Voltage
External WYE Connection
| Voltage | L1 | L2 | L3 | Join |
| High | 1 | 2 | 3 | 4 & 7, 5 & 8, 6 & 9, 10 & 11 & 12 |
| Low | 1, 7 | 2, 8 | 3, 9 | 4 & 5 & 6, 10 & 11 & 12 |
Dual Voltage
WYE-Connected Start
DELTA-Connected Run
| Voltage | Conn. | L1 | L2 | L3 | Join |
| High | WYE | 1 | 2 | 3 | 4 & 7, 5 & 8, 6 & 9, 10 & 11 & 12 |
| DELTA | 1, 12 | 2, 10 | 3, 11 | 4 & 7, 5 & 8, 6 & 9 | |
| Low | WYE | 1, 7 | 2, 8 | 3, 9 | 4 & 5 & 6, 10 & 11 & 12 |
| DELTA | 1, 6, 7, 12 | 2, 4, 8, 10 | 3, 5, 9, 11 | – – – |
Terminal Markings and Connections
Three-Phase Motors-Single Speed
IEC Nomenclature – 6 and 12 Leads
Single and Dual Voltage
WYE-DELTA Connections
Single Voltage
| Operating Mode | Connection | L1 | L2 | L3 | Join |
| Start | WYE | U1 | V1 | W1 | U2 & V2 & W2 |
| Run | DELTA | U1, W2 | V1, U2 | W1, V2 | – – – |
Dual Voltage*
| Voltage | Connection | L1 | L2 | L3 | Join |
| High | WYE | U1 | V1 | W1 | U2 & V2 & W2 |
| Low | DELTA | U1, W2 | V1, U2 | W1, V2 | – – – |
*Voltage Ratio: 1.732 to 1.
Dual Voltage
WYE-Connected Start
DELTA-Connected Run
| Voltage | Conn. | L1 | L2 | L3 | Join |
| High | WYE | U1 | V1 | W1 | U2 & U5, V2 & V5, W2 & W5, U6 & V6 & W6 |
| DELTA | U1, W6 | V1, U6 | W1, V6 | U2 & U5, V2 & V5, W2 & W5 | |
| Low | WYE | U1, U5 | V1, V5 | W1, W5 | U2 & V2 & W2, U6 & V6 & W6 |
| DELTA | U1, U5, W2, W6 | V1, V5, U2, U6 | W1, W5, V2, V6 | – – – |