How to install your WattREV-6 meter (3P4W Wye)

This post illustrates how to install your WattREV-6 meter on a 3-phase 4-wire (three phases with a neutral) Wye/Star electrical systems typical to European member states, UAE, Malaysia, China and more. Separate installations steps must be requested at for other electrical systems and if other metering equipment is deployed.



  • Installation must take place according to the documentation, using suitable equipment and tools.
  • Devices must be installed without voltage applied and by qualified personnel.
  • General safety regulations and nationally applicable accident prevention guidelines must be observed.
  • Electrical installation must be carried out according to the relevant safety guidelines


STEP 1: Prepare your meter installation report

The meter has 18 terminal inputs (I1 to I18) to connect the 18 CTs. Before the actual electrical wiring starts it is good practice that you plan and document which CT will be used for which circuit, and how they will connect them back to the meter.

  • The first step is to choose CTs with the most suitable primary rating for the circuit being monitored (e.g. a CT with a 300A primary rating for a circuit fed through a 250A circuit breaker).
  • You can then label all the CT heads to facilitate deployment and not get mixed with all the CTs around (e.g. a CT head labeled 4-3 will be clamped to Line 3 of your circuit number 4).
  • The labeling of the CT leads is also useful to avoid getting the leads mixed when pulling them through the distribution board, and to quickly identify where to connect the CT leads back at the meter terminals (e.g. a CT lead labeled 4-3 will be clamped to the meter input terminal I16 when using the WattREV-6 meter – see table below).



For clarity, it is necessary that the following is respected:

  • All circuits fed from L1 (phase A) must be connected to inputs I1, I2, I3, I10, I11 and I12
  • All circuits fed from L2 (phase B) must be connected to inputs I4, I5, I6, I13, I14 and I15
  • All circuits fed from L3 (phase C) must be connected to inputs I7, I8, I9, I16, I17 and I18

For example, a single-phase lighting circuit fed from L2 can be clamped with a CT wired back to meter terminal input I4. Similarly, a three-phase circuit fed from L1, L2, L3 can be clamped with three CTs wired back to meter terminal inputs I1, I4 and I7.



Now that you have sorted your wiring setup, you can now fill in your meter installation report now that your CTs are labeled.


A WattREV-6 Meter Installation Report template is available for download HERE.


STEP 2: Provide voltage references to your meter

Wire the meter voltage reference inputs to a Type C 6AMP 3P breaker to provide voltage reference for power calculation. Make sure the breaker is in the OFF position.

Note: the breaker must be fed from the same transformer as the circuits being monitored to ensure that the correct voltage references are applied for power calculations.



STEP 3: Supply power to your meter

Wire the meter L and N voltage supply inputs to the breaker L1 and N output terminals or short the V1 and VN reference voltage lines to the L and N voltage supply lines.



STEP 4: Prepare the meter for Rogowski coil or CT connections

Carefully attach the meter to din rail pre-mounted within the meter compartment. This process can also be done once all the Rogowski Coils and CTs are wired in the case wiring is made easier with the meter outside the meter compartment.

You can now remove the two current measurements terminal blocks from the meter (see below cover and terminal). The left terminal block has 9 inputs (I1 to I9, left to right), and the right terminal block has 9 inputs (I10 to I18, left to right)./p>


STEP 5: Deploy the Rogowski coil and/or CTs

The next step is to clamp the Rogowski Coils or CTs to the electrical circuits and wire them back to the meter current measurements terminal blocks. This procedure must be conducted as follows with extreme precautions:

    • Power the circuit down temporarily (working with live circuits may be possible if all safety precautions are taken and under agreement from the customer)
    • Position the Rogowski Coil or CT next to the circuit to be clamped, but do not clamp them until the CT lead has been wired to the meter to avoid major safety risks (this is valid for CTs with 1A or 5A output, however 333 mV CTs do not require shorting blocks or prior connection to the meter because they have a burden resistor built into the CT that limits the output voltage to a safe 333mV under all conditions.)
    • Pull the CT lead back to the meter via pre-mounted cable glands, trunken and other covers.
    • Wire the two CT lead wires to the correct meter terminal input. Take the positive (white or red) lead wire and insert it into the lower circular opening of the current measurement terminal (e.g. I1 37, I2 39, etc). A tiny screwdriver should be inserted into the upper square opening and pressed down to allow the lead wire to be inserted properly.
      White/Red wire = + (positive)
      Black/Brown wire = – (negative)



      Repeat for all Rogowski Coils and CTs you plan on deploying and place the terminal block back into the meter module when the wiring is complete.

    • Clamp the CT heads or Rogowski Coils to the circuit paying attention to the labels to ensure that you clamp the correct circuit and to the direction in which you clamp the circuits.

Clamping Hinged and square CTs
The red/white leads will be your positive wire and the black will be the negative wire. Also, on the CTs there is an arrow which dictates the polarity. The arrow should be facing the load. If you have the arrow towards the load and the red/white lead and black lead in the correct positive and negative terminals of the meter’s CT input channels then the kWh will accumulate correctly.

Clamping Rogowski Coils
For the Rogowski coil CT’s, the white leads will be your positive lead and the brown will be the negative lead. The RCT’s have a arrow on the black connector where you snap together the two ends. This must also be facing towards the load.

  • Power the circuits back up after all Rogowski Coils or CTs have been deployed

At this stage, the meter is wired to the circuit breaker and all Rogowski Coils and CTs are clamped and wired back to the meter.

STEP 5: Switch the breaker on to power up the meter

Switch on the breaker to supply power to the new meter. The meter will power up and will after a few seconds emit a red LED light (L1).


STEP 6: Configure your meter

The meter has a total of 18 current measurements terminal inputs called channels (I1 to I18), that are connected to up 18 CTs used to monitor up to 6 three-phase circuits, 18 single-phase circuits or a mix of both (see installation report). You must now configure your meter terminal inputs to the correct primary rating size of the Rogowski Coils and CTs wired to them (e.g. if a 300A CT is wired to the channel I1 then I1 must be configured to 300A). This procedure is executed via the meter display:

    • Press the meter display’s left and right arrows together to go back to top menu

    • Select the Settings menu, enter the password 0000, then press the cursor left until you reach the CT TYPE submenu. There you need to set the correct AMPERE size for each terminal input, one by one. For example, if you used a WattRCT16-2500 Rogowski Coil to monitor the three phases of your circuit 5, you need to set a value of 2500 for the meter channels I11, I14 and I17.

  • Press the OK button to register each AMPERE value, and move on to the next channel until you are done. At the end verify that all channels are configured properly in case you didn’t save correctly, this is extremely important as you will otherwise get incorrect readings.


STEP 7: Provide network access to your meter

  • Connect an Internet cat5 cable to the meter’s Ethernet port.
  • Press the meter display’s left and right arrows together to go back to top menu
  • Select the NET menu, enter the password 0000 and press OK. Then press OK to enter the DHCP Setting configuration.
  • You must either enable DHCP (so the meter gets discovered and is assigned an IP address automatically), or change its IP address to be within the correct IP range. To enable DHCP, set the DHCP Setting tab to AUTO and press OK to save it. If you want to assign a static IP address, follow the steps below:

    •Press the right cursor until you reach the DHCP Setting tab, press OK and set to MANU. Press OK to save.
    •Press the right cursor until you reach the IP ADDRESS tab and register the IP address to be used.
    •Press the right cursor until you reach the SUBNET MASK tab and register the IP address to be used.
    •Press the right cursor until you reach the GATEWAY IP ADDRESS tab and register the IP address to be used.

  • The meter network interface must be rebooted to enable the new network settings. Turn the meter off via its MCB circuit breaker for 5 seconds and turn it back on.
  • Press the meter display’s left and right arrows together to go back to top menu
  • Select the NET menu, enter the password 0000 and press OK. Press the right cursor until you reach the IP ADDRESS configuration.
  • Write down the IP address of your meter, you may need it to access the meter’s webserver configuration page.


STEP 8: Configure the meter time clock

Set the meter time clock to your local time via the meter display menu:

  • Press the meter display’s left and right arrows together to go back to top menu
  • Select SETTINGS at the main screen and press ‘OK’.
  • Enter the meter password (default is 0000) and press ‘OK’.
  • Press the left cursor until you reach the TIME SET tab.
  • Set the local time and press ‘OK’


STEP 9: Configure your meter for data push to Wattics

This step is not necessary if your meter has already been pre-configured by Wattics or if you use the Octopus Gateway.


Connect a PC or laptop connected to the same LAN as the meter, open an Internet browser window (e.g. Firefox, Chrome or Internet Explorer), type in the meter IP address in the URL bar and hit the Enter key. The meter’s web server page will be displayed.

Alternatively you can unplug your meter from the LAN and connect it to your laptop with a cat5 cable for configuration. That process may not always work depending on your network settings. The meter will need to be reconnected to the LAN after configuration.




Click on the ‘Settings’ menu tab and submit the password (default password is ‘12345678’).



After the password has been entered, a ‘Network Parameter Configuration’ page is displayed.



  • Your meter should be set to Auto Setting (DHCP enabled), so do not changed anything. If you wish to set a specific network configuration you will need to get IP Address, Subnet Mask and Gateway IP address from your IT department.
  • Enter and for the primary and secondary DNS servers.
  • Enter ‘502’ for the MODBUS Port.
  • Enter ‘80’ for the HTTP Port.
  • Enable SNTP, and click on the link below to find the correct SNTP server for your country. On the link you will need to select your area and copy one of your country’s servers URL. That URL must be copied in the SNTP Server field.

For example, for Italy, you will click on Europe, then Italy, copy the first server, i.e., and paste it in the SNTP Server field.

  • Select the correct timezone for the geographical location where the meter is installed.
  • Click submit.


You must now hover over the ‘Settings’ tab and select the ‘Http Push’ option from the list.

Configure your meter to automatically send data to Wattics cloud platform as follows:

  • On the Http Push webpage, tick the ‘HTTP POST Enable’ button.
  • Set the Post URL received from Wattics by email.
  • Enter the Meter ID received from Wattics by email.
  • Set ‘HTTP Port’ to 80.
  • Leave ‘Post Channel 2’ sub-menu empty.
  • Set ‘Post Interval’ to 5 minutes.
  • Tick all five ‘Post Content’ buttons.



Click on ‘Submit’ to complete the configuration. Reboot your meter (power down and up again via its MCB circuit breaker), your meter is now configured to upload new data readings to the Wattics platform every five minutes.


STEP 10: Submit your installation report to Wattics

Submit your installation report to Wattics via:

Wattics will use your installation report to confirm that data is being received from your meter and correctly shown in your dashboard. You will then receive credentials to log in to your Wattics Dashboard at and get started!

Troubleshooting: if you don’t see data in the dashboard, you can test your network setup for data push to Wattics, to ensure the firewall does not block outbound communication:



Please contact us at if you have any difficulty with configuring your system.


Anthony Schoofs

Chief Technical Officer at Wattics
Anthony drives Wattics' innovation on energy efficiency for industrial and grid environments. Anthony is also behind, a blog covering technology advances within the smart grid and IoT markets, and was listed in 2011 amongst the top 100 IoT thinkers. Anthony was recently awarded the Globe Sustainability Research Award for his contribution to advancing knowledge on sustainability.