EKM Metering

I built an addition that houses a subpanel for the electric for the addition as well as our hot tub. I would like to install a submeter to monitor the kw used by the subpanel. It looks like a typical install (see pic). So my parts list is:

EKM-OmniMeter II UL v.3 – Universal Smart Meter, Single Phase or 3-Phase, 120 to 240V, 50/60Hz, up to 5000 Amps
2x Split-core CT, 200A, 200A:26.6mA, 13mm (0.51") Hole Diameter, SCT-013-200
Indoor Enclosure Kit EKM-IENC

I watched the video and it seems very straightforward. Do I have the right stuff? Thanks

Hello t84a! Welcome to our forums!

Thanks for the photo and the clear description of what you are looking to purchase!

Your photo does look like a typical 120/240 volt 3-wire US residential system. You have 2 hot wires (in this case both black) coming in at the top of your sub-panel. If you measured the voltage between these 2 wires you would get roughly 240 volts. If you measured the voltage from either of the hot wires to a neutral wire you would get roughly 120 volts. Your install will be very similar to the video you referenced:

https://www.youtube.com/watch?v=nvTTFxy_yQw

Here is additional information about 120/240 volt 3-wire systems:

https://help.ekmmetering.com/support/so ... v-metering

The items you are intending to buy look correct. I would double/triple check that the wires you want to install the CTs on are under 13mm in diameter (under 1/2"). Buying CTs that are too small to fit the wires you want to measure is one of the more common mistakes in ordering.

I would also consider buying 2 of the 1 amp Inline Fuse Holders. I would install these close to the voltage reference in the sub-panel. These will protect the voltage reference wires that feed your submeter.

If you are planning on submetering Water or Gas in the future I would consider the Omnimeter Pulse v.4, otherwise the Omnimeter II v.3 UL will work well for your needs.

With the Omnimeter II v.3 UL connected as a read off the face (not connected to a computer) you will be able to keep track of how much energy is moving through this subpanel over time. You have the option to add connectivity to a computer or to the internet at a later date.

Hope this helps. Let us know if you have any questions.

Thanks. Just the info I was looking for. Can I use a GFCI breaker as a reference? I'll report back on my progress.

Yes, a GFCI breaker should be fine.