Electro-Voice 1252, 250 operation manual Chapter Electrical Installation

Chapter 4

Electrical Installation

4.1: Wiring the Monitored Inputs and Voltages

Select a wiring diagram from Section 4.8 that best suits your application. Wire the Nexus 1250/1252 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 Communicator EXT software; see the Communicator EXT User 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.

4.2: Fusing the Voltage Connections

For accuracy of the readings and for protection, EIG requires using 0.25-Amp rated fuses on all voltage inputs as shown in the wiring diagrams (see section 4.8).

The Nexus 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 Option - G, the direct voltage input is extended to 300V phase to neutral and 600V phase to phase.

4.3: Wiring the Monitored Inputs - VRef

The Voltage Reference connection references the monitor to ground or neutral.

4.4: 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.

4.5: 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.

Electro Industries/GaugeTech Doc # E107706 V1.25 4-1