4 Standard Connections
4.1 Current Transducers
Only current transducers which meet the manufacturer’s specifications should be used.
Current Transducer (CT) connections are not galvanically isolated from the voltage inputs and
must therefore not be accessible to the operator after installation. Installed CT cables and any
extensions to these, must not be accessible to the operator.
Minimum Current Transducer Specification:
Input Current Range: 0 to 1.2 In (In = nominal rated current in amps)
Output Voltage: 0.33Vac at In
Insulation: 600Vac (Core to secondary conductors)
Cable: Operating Temperature, 105°C (221°F)
Insulated 600Vac
The following list of UL & CE recognised current transducers has been approved for use with the Cube/Rail series of meters:
Part Number Primary Current (XXX) Secondary Window Size
XFR/S0142/XXX 5, 10, 30, 50, 75, 100, 150, 200Amps 0.333Vac 19.1 x 19.1mm(0.75” x 0.75”)
XFR/S0152/XXX 75, 100, 150, 200, 300, 400, 600Amps 0.333Vac 31.8 x 31.8mm (1.25” x 1.25”)
XFR/S0162/XXX 100, 200, 300, 600, 800, 1000, 1500Amps 0.333Vac 50.8 x 50.8mm (2.0” x 2.0”)
XFR/S1142/XXX 5, 10, 30, 50, 70, 100, 150, 200Amps 0.333Vac 19.1 x 19.1mm(0.75” x 0.75”)
XFR/S1152/XXX 50, 70, 100, 150, 200, 250, 300, 400, 600Amps 0.333Vac 31.8 x 31.8mm (1.25” x 1.25”)
XFR/S1162/XXX 100, 200, 300, 400, 600, 800, 1000, 1200, 1500Amps 0.333Vac 50.8 x 50.8mm (2.0” x 2.0”)
XFR/S1172/XXX
1
400, 600, 800, 1000, 2000, 3000Amps 0.333Vac 127.0 x 76.2mm (5.0” x 3.0”)
NOTE 1: Model XFR/S1172/XXX is only approved for use up to an ambient temperature of 30ºC (86°F). All other models
are approved for use up to 55ºC (131°F).
If the current transducer secondary cables require extending, care must be taken to avoid pickup of electrical interference.
With suitable low capacitance screened cables, the cable can be extended to 100m (328ft) or more.
Extensions to the supplied current transducer cables must ensure all connections remain
inaccessible to the operator after installation.
All cables and connections must meet the minimum specifications provided.
4.2 Voltage Connections
To maintain proper insulation from the mains supply, the neutral wire should only be used in
power networks where the system neutral is protectively earthed
4.2.1 Voltage Cables
Voltage cables must be rated for safe use in the electrical enclosure which houses the meter
(e.g. UL1015) and must meet the following minimum specification: Temperature: 105°C
(221°F); Insulation 600Vac.
4.2.2 Auxiliary Mains Supply
The meter is powered from an auxiliary mains supply which is required to energise the metering circuit and display. This
can be connected in parallel with one of the measurement phase voltages if it is rated correctly.
Ensure the auxiliary mains supply L-N is powered from a correctly rated and fused AC source
as specified on the meter label.
4.2.3 Voltage Terminals
Voltage: 277Vac (3-4)
480Vac (4-5, 5-6)
Cable: 30-14 AWG, Stripped 5.5 to 6.5mm (0.2” to 0.25”)
Torque: 0.5Nm (4.4in lb)
