Electronics > Beginners

How do home power monitors work?

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SG-1:
If the delta is corner grounded, that phase could supply the ground reference the meter power supply is asking for. 

MiDi:
If there is no measurement of voltage, this is just an AC Current Clamp Meter with a calculator.
The (apparent) power values displayed (in VA) may be way out of what you are paying for (real power/energy) - this is just a toy and nothing serious.
For serious results you cannot come accross a (certified) Energy Meter.

SG-1:
Looking closer at the meters connections in Post 11 it shows L & N or 1 & 2, so no neutral needed.

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