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SPD200K/300K
Figure 5: Three-Phase, Three-Wire + Ground, Delta Installation
The ground connection of the Delta SPD shall be connected to the system ground conductor. The
neutral conductor is not present on Delta systems.
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
SPD
Ground
Phase B
Phase C
Phase A
B
A
C
Corner Grounded Delta
SPD
Ground
Phase B
Phase C
Phase A
B
A
C
Ungrounded Delta
