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ELECTRICAL CONNECTIONS (CBM)
WARNING: a 4-wire three-phase distribution system is required.
The CSS must be connected to a power supply source providing 3-phase + neutral + PE (protective earth) of a TT, TN
or IT type. The phase rotation must be correct.
In the IT system a 4-pole thermal-magnetic circuit breaker is mandatory.
Optional TRANSFORMER BOXES to convert the distribution systems from 3-wire to 4-wire are available upon request.
WIRING DIAGRAMS FOR CONNECTING TO THE ELECTRICAL SYSTEM
NOTE: within the following diagrams, the symbol denotes a three-phase connection and the symbol denotes a single-phase connection.
CSS w/o any variation in the neutral condition CSS with galvanic isolation at the output
CSS with galvanic isolation at the input
* LVS: low voltage source
Table 21
Protective devices must be present on both the main input line and the bypass line.
Note: the neutral of the input line and that of the bypass are commoned inside the equipment, so they must refer to the same potential.
If the two power supplies are different, an isolation transformer has to be used on either of the inputs.
CSS with galvanic isolation
CSS with galvanic isolation at the input CSS with galvanic isolation at the Bypass input
* LVS1: low voltage source 1; LVS2: low voltage source 2;
Table 22
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