CHAPTER 4: ELECTRICAL INSTALLATION WIRING THE MONITORED INPUTS AND VOLTAGES
EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 4–3
4.2 Wiring the Monitored Inputs and Voltages
Select a wiring diagram from Section 4.5 that best suits your application. Wire the EPM
9450/9650 meter exactly as shown. For proper operation, the voltage connection must be
maintained and must correspond to the correct terminal. Program the CT and PT Ratios in
the Device Profile section of the GE Communicator software; see the GE Communicator
Instruction Manual for details.
The cable required to terminate the voltage sense circuit should have an insulation rating
greater than 600V AC and a current rating greater than 0.1 Amp. Use a minimum of 14
AWG wire for all phase voltage and current connections. The maximum installation torque
for both the current input terminals and the voltage connections is 1 Newton-Meter.
4.2.1 Fusing the Voltage Connections
For accuracy of the readings and for protection, GE requires using 0.25-Amp rated fuses on
all voltage inputs as shown in the wiring diagrams (see Section 4.5).
The EPM 9450/9650 meter can handle a maximum voltage of 150V phase to neutral and
300V phase to phase. Potential Transformers (PTs) are required for higher voltages with the
standard rating. With system voltage option B (277/480 Volt connection), the direct voltage
input is extended to 300V phase to neutral and 600V phase to phase.
Note
System voltage option B (277/480 Volt connection) is only intended for use with direct
connections. For PT connections, use system voltage option A, the standard 150 Volt
version.
4.2.2 Wiring the Monitored Inputs - VRef
The Voltage Reference connection references the monitor to ground or neutral.
4.2.3 Wiring the Monitored Inputs - VAux
The Voltage Auxiliary connection is an auxiliary voltage input that can be used for any
desired purpose, such as monitoring neutral to ground voltage or monitoring two different
lines on a switch. The VAux Voltage rating is the same as the metering Voltage input
connections.
4.2.4 Wiring the Monitored Inputs - Currents
Install the cables for the current at 600V AC minimum insulation. The cable connector
should be rated at 10 Amps or greater and have a cross-sectional area of 14 AWG.
Mount the current transformers (CTs) as close as possible to the meter. The following table
illustrates the maximum recommended distances for various CT sizes, assuming the
connection is via 14 AWG cable.
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