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The CT must go on the hot (live) power feed wire only. If you were to clamp it across all conductors like you suggest (live / neutral / ground), the live and neutral current flow would cancel out (subtract), and you would read zero current flow under all conditions. This is not an Emporia thing specifically – true for monitoring any current with a CT in general.
One thing you can do in the UK with single phase is that you can reverse the CT, and clamp over just neutral instead of live. That will also work (since AC current flows between live and neutral and vice-versa), but I’m not sure if that helps your situation or not.
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This reply was modified 2 years, 10 months ago by
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This reply was modified 2 years, 10 months ago by
I had a similar problem where a power interruption (and restoral) resulted in no data updates (Vue2 seemingly offline). I also have 2 Vue2’s, and only 1 was in this state – despite power cycling. Turned out that the WiFi router needed to be rebooted. There is some issues with NAT and port forwarding that the Vue2 seems to be unhappy about. Perhaps this is worse for people with multiple Vue2’s. So next time this happens – try powering down your all your Vue2’s, power down your WiFi router and re-power, then re-power the Vue2’s.
The 200A clamps are for connection to single phase, split phase (aka 2-phase), and 3-phase mains (1-3 ports and clamps used depending on electrical service). For the UK, you are 240V (50Hz) and single phase. That would mean you would use a single 200A clamp for your combined mains power feed (before both meters). You can’t use another 200A clamp (on the A/B/C ports) to measure a separate circuit, such as you are trying to do with heat and other loads. That is where you would use the 1-16 ports and the 50A clamps.
If you can’t place the single 200A clamp before the two meters (physically, etc), you can purchase a 3.5mm Y cable and combine (2) 200A clamps into the single A port. That way you can get the combined reading for your domestic loads and heat, and clamp after those meters. If you want to then know the individual power in each, that is where you would add the 50A clamps (connected to ports 1-16) and clamp those around the circuits you want to specifically monitor.
After you make this change, you’ll probably want to re-setup the software as it is surely confused by seeing power on something other than the A port for a UK installation. It is probably improperly assuming split-phase currently, if you are indeed using port B (which shouldn’t be being used for single phase).
Hope that helps.
Agree this would be a welcome feature. Note that this is typically not done on UL listed / NEC compliant energy monitoring products due to the fact they are designed to be placed inside the electrical panel. Under a fault condition (such as chafed insulation in the Ethernet cabling, etc) a short circuit would electrify the lower voltage signalling circuits leaving the box – presenting a high voltage on the Ethernet cabling and end-device. Because of such a scenario, it is generally not permissible by NEC to have low voltage wiring coexisting unchecked with AC mains voltage – and leaving the box. Special physical partitioning is required to isolate the high and low voltage aspects, and this would not be present in a standard electrical panel.
Some Ethernet energy monitors (like The-Energy-Detective) get around this by using power line communication and having the Ethernet gateway outside of the panel. But typical PLC challenges apply with that approach (interference, reliability).
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This reply was modified 2 years, 10 months ago by
