"Two pads near the top of the board channel 240V AC electricity from the large copper wires onto the board and into the adjacent blue transformer box that steps it down to about 10V AC. From there, the AC voltage is rectified and conditioned to power the DC components on the board."
For power metering, the Smart Meter needs the current and voltage waveforms. So these pads are probably for voltage measurement in addition to powering the board.
"Two pads near the top of the board channel 240V AC electricity from the large copper wires onto the board and into the adjacent blue transformer box that steps it down to about 10V AC. From there, the AC voltage is rectified and conditioned to power the DC components on the board."
For power metering, the Smart Meter needs the current and voltage waveforms. So these pads are probably for voltage measurement in addition to powering the board.