Tuesday, February 2, 2010

The Energy Detective

After reading reviews for several home power meters, I decided on a TED 5000, a decision I might revise if I had the chance.  The device seems to be well designed, is easy to use, and fairly accurate as far as I can tell, however the data transmission over power lines is not extremely reliable.  The unit works on-and-off, depending on what else you have turned on, or even plugged in around the house.  I would much prefer a ZigBee (or WiFi) wireless design, which would probably be more reliable.  Regardless of this, I like the idea of having a power meter and may be able to isolate interference and get it to work reliably - and I had fun installing it.
My house has two electrical distribution panels: the main panel outside drives 240v circuits and also a sub-panel in the garage, which powers the remainder of the house.  You can see the exterior of the main panel to the right.
More Wiring Problems
Here is the inside of the main panel.  You can see how the previous owner installed a 50 Amp breaker on a 12 gauge wire to try and keep the oven from tripping the breaker.  The problem, however, is with the oven, and the larger breaker just lets the faulty oven overcurrent the house wiring.
Here you can see the two Current Transducers clamped around the main service lines and the primary meter behind the wiring on the right.  Also notice that I replaced the improper 50 Amp breaker with a 20 Amp breaker, and added two 15 amp breakers to power the TED meter, one on each phase.
The installation on the sub-panel in the garage was similar.  Notice that I have properly restored power to the attic by replacing a single pole breaker with a double pole unit after previously disabling the faulty wiring.

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