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4-Wire Split-Phase Case

Last Updated: Mar 21, 2016 10:30AM PDT

Installation:

Ideally, the CTs would be installed as such:


CT1, Phase A, Neurio’s Black Wire

CT2, Phase B, Neurio’s Red Wire

CT3, Phase B, Neurio’s Blue Wire

CT4, Phase A, Neurio’s Black Wire (shared with CT1)


It can be tricky to determine which wires and breakers are on the same phase, but it’s not actually critical for this installation case. If you get anything wrong, it should only result in about a 0.3% decrease in accuracy, but everything should still work. If you want high accuracy, follow steps 1-5 below, otherwise, just clip all 4 CTs around the 4 mains wires (labels facing away from the main breaker) and connect the Sensor’s black, red and blue wires to any breakers. Connect the white wire to the neutral bus bar, then skip to step 6.


1. Clip a CT around one mains wire with the label facing away from the main breaker. We’ll call this “Phase A”. Plug this CT into Channel #1 on the Sensor.


2. By visually tracing the mains wire or using a multimeter, figure out which of the remaining 3 mains wires is also “Phase A”. Clip another CT around this mains wire, and plug the CT into Channel #4 on the Sensor.


3. The remaining two mains wires are “Phase B”. Clips CTs around each of them, and plug them into Channels #2 and #3 on the Sensor.


4. Using visual inspection or a multimeter, determine which breakers are connected to the “Phase A” mains wires. Connect the Sensor’s black wire to one of these breakers. If there are no free breakers, you can use the included jumper wire and wiretaps to connect the existing wire and the Sensor’s wire to a single breaker.


5. Using visual inspection or a multimeter, determine which breakers are connected to the “Phase B” mains wires. Connect the Sensor’s red and blue wires to one or two of these breakers.


6. Follow the remainder of the installation instructions as normal (mount the product, install the antenna, etc)


Sensor Configuration:


1. When it comes time to configure the device, put in your email address, select “2-phase / Split-phase”, and no generation. Click on “Connect to Home WiFi”.


2. In the next screen, instead of joining your WiFi network, go to the “Sensor Readings” and look for negative numbers on the “Power” value for different CTs. If you see any, make note of which CT channels are negative.


3. Now click on the “Sensor Settings” button, then “Advanced Settings”.


4. In the “Sensor Settings” section, check the boxes to match those shown in the image below.

(Firmware 1.0.8)

(Firmware 1.1.0)


5. In the “Invert CTs” section, check any boxes that were showing negative values in step 2.


6. Click “Save”


7. Click on “WiFi Settings” and join your WiFi network.


8. From here on out, the process should be normal. Next you should get an email from Neurio, which you can use to make an account on my.neur.io.


This process will override Neurio’s auto-configuration wizard, which is the screen where you put in your email address, and choose 2-phase. If you go back to that screen and click the “connect to home wifi” button, the auto-configuration will run again, and overwrite the custom values you just set. To avoid this, just click directly on the “WiFi Settings” tab if you need to connect to a different WiFi network after you’ve set your custom Sensor Settings.

 
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