37
2.
Installation and wiring
2.8 Wiring diagrams (continued)
The following wiring is also possible as a further method of measuring.
■
For 1-phase 2-wire voltage selected
The 1-phase 2-wire branching off from the 1-phase 3-wire is measured. With this connection, a setting is required
according to which of R-N phase, T-N phase, or R-T phase is connected to the 1-phase 2-wire circuit. (
58) The CT
must be attached to the R-phase or the T-phase.
■
For 1-phase 3-wire composite
The 1-phase 3-wire circuit and the 1-phase 2-wire branching off from it are measured at the same time. With this
connection, a setting is required according to which of R-N phase, T-N phase, or R-T phase is connected to the 1-
phase 2-wire circuit. (
58) The 1-phase 2-wire circuit CT must be attached to the R-phase or the T-phase.
Load
Breaker
Load
Breaker
Load
Breaker
Load
Breaker
Power side
N
R
T
Circuit A (CT1)
Circuit B (CT2)
Circuit C (CT3)
Circuit D (CT4)
Load
Breaker
Load
Breaker
Load
Breaker
Circuit A (CT1 to 2)
Circuit C (CT3)
Circuit D (CT4)
Power side
N
R
T