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