Subpanel

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t84a
Posts: 2
Joined: Mon May 23, 2016 3:42 pm

Subpanel

Post by t84a »

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

Image
Jameson
Posts: 860
Joined: Fri Nov 04, 2011 7:42 pm
Location: Santa Cruz, CA
Contact:

Re: Subpanel

Post by Jameson »

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.
Jameson
EKM METERING
http://www.ekmmetering.com
831.425.7371
t84a
Posts: 2
Joined: Mon May 23, 2016 3:42 pm

Re: Subpanel

Post by t84a »

Thanks. Just the info I was looking for. Can I use a GFCI breaker as a reference? I'll report back on my progress.
Jameson
Posts: 860
Joined: Fri Nov 04, 2011 7:42 pm
Location: Santa Cruz, CA
Contact:

Re: Subpanel

Post by Jameson »

Yes, a GFCI breaker should be fine.
Jameson
EKM METERING
http://www.ekmmetering.com
831.425.7371
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