PowerLogicTM Series EM4000 | 930-134-01-A.00 |
Installation Guide | 11/2013 |
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Installing the Current Transformers
The two models of PowerLogic EM4000 meter use current transformers (CTs) with different secondary outputs. The PowerLogic EM4033 meter uses split-core 0.333V CTs (see Figure 10), and the PowerLogic EM4080 meter uses 80mA CTs only (see Figure 11) and is typically used where accuracy is important and long secondary CT wiring is required (up to 300 feet [91.44 meters]). The PowerLogic EM4080 meter can also use a 5A CT if a 5A converter has first been installed.
For instructions, see “Installing the CTs on the PowerLogic EM4033 and PowerLogic EM4080” on page 20, and “Installing 5A Converters and CTs on the PowerLogic EM4080” on page 21.
Current transformers connect to the PowerLogic EM4033 and PowerLogic EM4080 meters through the 50-conductor CT cable provided with the meter. Table 2 describes the CT wire pairs and the cable color scheme for each meter point. You can also find this information on the inside of the meter’s outer cover.
Each CT has an X1 (positive) and X2 (neutral) wire pair and uses butt-splice connectors to attach the CT to a specific meter wire pair. The direction of the energy flow is indicated on the CT by: a label (“This side towards source”); an arrow that points away from the source; or a stamp/label indicating which side is H1 (H1 side faces toward the source).
CT shorting blocks are recommended for all CT installations. CTs measuring live current must either be connected to the PowerLogic meter via the 25-pair CT cable, or the secondary output of the CTs must be shorted together. Open-circuit CTs may generate a hazardous voltage and could damage equipment or cause personal injury.
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