eGauge Installation

Covers topics related to the physical aspects of eGauge installation.

eGauge Installation Examples

Wiring diagrams and basic configuration examples for installing the eGauge on different types of electrical systems.

eGauge Installation Examples


The EG4xxx series meters are capable of monitoring up to 7 single-phase units (EG4015) or 15 single-phase units (EG4030) with a single meter. Single-phase units require 2 CTs each, one for each phase.

Please visit for an overview of the physical installation and configuration process.

Example Wiring Diagram

Below is an example diagram of an EG4015 measuring 7 single-phase units on a distribution panel.

Ensure the meter's L1, L2, and L3 breakers are the same phases as the panels L1, L2, and L3 phases, or a phase-mixup will occur and recorded data will be incorrect. See this article for more information on phase checking.

The meter in the diagram shown below does not reflect the physical layout or dimensions of the eGauge meter.

Panel layout and installation will vary. The meter must be configured in software to match the physical installation before any data will be recorded.


A diagram showing the CT connections for the last 3 units from above may be found here.

Example Configuration

Sensors (CTs)

In most submetering installations the same model CT will be used on all breakers. In this example, all CTs are set as 100A 20mm AccuCTs. If using CTid CTs, please click the blue CTid button to configure CTid sensors.



Registers define the data points the Gauge meter records. Each power calculation consists of a sensor input (S1, S2, S3...) that has the CT, and the voltage phase it is on (L1, L2, L3). Since each single-phase unit uses 2 CTs, there are 2 power calculations in each register added together to define the total usage of that unit.

Note, while the phasing pattern for units is typically staggered as L1 and L2, then L3 and L1, then L2 and L3, and so on, in the above example this changes with Unit 5 because the breakers for Unit 5, 6, and 7 begin on the right-hand side of the panel.



eGauge Installation Examples

Standard split-phase backfed

Basic installation measuring power coming from a power utility (grid) and from a single-phase solar-system inverter





eGauge Installation Examples

Direct-feed Solar

Same as Standard Split-Phase installation, except that the inverter feeds directly into the power utility’s grid. That is, the Solar CT is closer to the utility than the Grid CTs. This situation often arises when solar power is delivered via a line-side tap.




eGauge Installation Examples

Three phase 120/208 or 277/480 Wye w/ single-phase inverter

Standard three-phase installation measuring power coming from a power utility (grid) and from a single-phase solar-system inverter. The color coding shows 120/208V, but applies to 277/480V as well. This diagram is for a Wye system with a neutral. Refer to delta diagrams for systems without neutral.




eGauge Installation Examples

​Monitoring 480V and 600V delta systems

The eGauge is capable of directly measuring voltages up to 277V L-N (480V L-L). In the case of a delta system with no neutral, the maximum phase-to-phase voltage is 277V as the "N" terminal of the meter has one of the line voltages connected.

A 480V or 600V delta without a neutral may be monitored by the eGauge using EV1000 High Voltage Sensors.

The below diagram shows a 480V delta system. 600V delta systems may be measured in an identical manner.