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19
IO-70064
05/2020
ASCO 460/465/480/485 Surge Protective Device (SPD)
Wiring
Figure 9:
Three-Phase, Three-Wire + Ground, Delta Installation
Note 7:
The ground connection of the Delta SPD shall be connected to the system ground conductor.
The neutral conductor is not present on Delta systems.
Note 8:
Phase B of the electrical system is typically the grounded phase
A
2
1
3
4
6
5
7
8
B
C
N
A
B
C
N
A B
N
C
G
THREE POLE
C
N
G
A
TWO POLE
2
1
3
4
6
5
7
8
G
C B A
THREE POLE W/ DS
N
G
B
SINGLE POLE
C
N
G
B
A
THREE POLE
C
2
1
3
4
6
5
7
8
B
A
N
C
B
A
N
A
B
N
C
G
THREE POLE
C
N
G
A
TWO POLE
2
1
3
4
6
5
7
8
G
C B
N
A
THREE POLE W/ DS
N
G
B
SINGLE POLE
C
N
G
B
A
THREE POLE
SPD
See Note 8
Ground
Phase B
Phase C
Phase A
B
A
C
Corner Grounded Delta
SPD
See Note 7
Ground
Phase B
Phase C
Phase A
B
A
C
Ungrounded Delta
