Wiring; Protective Earthing; Power Transformer; Figure 5 Class 2 Transformers Available From Mobiltex - Cortalk RMU5 Generic Installation And Configuration Manual

4.2 Wiring

WARNING: Ensure that any power sources supplying the RMU5 are off while performing any wiring on the
RMU5.
WARNING: Ensure that all wire used for interconnections meets the voltage, current and temperature
requirements for the particular installation site.

4.2.1 Protective Earthing

To avoid electric shock, the protective earth terminal must be connected to earth ground. Before making connection to
the input or output terminals of the product, ensure that the product is properly grounded.
A ring lug pre-terminated #10 green/yellow cable is supplied with the RMU5 for earth ground attachment purposes.
Remove the #10 nut and star washer from the protective earth terminal, place the ring lug of the cable over the stud, then
re-install the star washer and #10 nut. Connect the other end of the cable to a suitable earth ground point.

4.2.2 Power Transformer

An external Class 2 transformer must be installed in the rectifier to provide 24VAC/40VA to the RMU5 for power. The
exact model of transformer is installation dependent due to varying supply voltages feeding rectifiers.
Figure 5 shows various Class 2 transformers that may be supplied by Mobiltex with the RMU5. Mobiltex P/N
T01A42BE5DG can be used with 208V or 240VAC line voltages. Mobiltex P/N T01A420BE2G can be used with
120VAC line voltage. Mobiltex P/N T01A42TR401 can be used with 120V, 208V, or 240VAC lines voltages. Finally,
Mobiltex P/N T01A42TR501 can be used with 120V, 240V, 277V, or 480VAC line voltages.
Many different types of Class 2 transformers are available which are compatible with the RMU5. A transformer with a
20-24VAC/40VA nominal output winding rating should be used with the RMU5. The primary input voltage is
determined by the power system available at the RMU5 installation site. Install the transformer according to the
manufacturer's instructions and connect the secondary windings to the RMU5 main power input.

Figure 5 Class 2 Transformers Available From Mobiltex

Connect the appropriate primary side taps of the transformer to the L1 and L2/N line input connection points on the
device being monitored. An external switch or circuit-breaker and external overcurrent protection device (sized to the
transformer specifications) should be installed on the primary connections of the transformer and be located near the
RMU5. Consult the documentation provided by the transformer manufacturer to determine the correct primary tap wires
required for a particular input voltage.
MOBILTEX® DATA LTD.
Calgary, Alberta
TITLE:
RMU5 Generic Installation and Configuration Guide
DOCUMENT NO.: SHEET:
RMU5-MAN-001
REV:
13 of 69 1.10