207.4
205.2
205.2
V AC
V AC
V AC
Auto
1
2
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Detecting power interruption –
measurement procedures
120 V
208 V, 3
φ
circuit
208 V, 1
φ
circuit
120/208 V,
3
φ
circuit
120/208 V,
1
φ
circuit
Utility
power
lines
Ungrounded (hot)
conductors
Utility
transformer
bank
Grounded
neutral
conductor
120 V,
1
φ
circuit
208 V
208 V
208 V
N
A
N
N
Neutral busbar
A to N
B to N
C to N
Single-Pole (SP)
or 1-Pole
Double-Pole (DP)
or 2-Pole
Double-Pole (3P)
or 3-Pole
115 V, 1
φ
general-purpose circuits
208 V, 1
φ
lighting and power circuits
208 V, 3
φ
circuits
A to B
B to C
C to A
A to B
to C
N
N
A
B
C
C
B
120 V
120 V
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