h90 Posted June 20, 2015 Share Posted June 20, 2015 On the Zero line some voltage comes, which is normal I guess. We have the Zero connected to Earth cable. Now the big question: do we pay for the electric that goes from Zero to Earth? Crossy once teached me that when the electric goes L to Earth the meter runs the same as if it would go to the Zero. But what is with the Zero? Link to comment Share on other sites More sharing options...
Crossy Posted June 20, 2015 Share Posted June 20, 2015 A conventional (rotating disc) meter has three coils:- One across L-N to measure the voltage One in series with the Live to sense current One in series with the Neutral also to sense current. These coils, in conjunction with the aluminium disc form a small induction motor. The physical relationship between the coils and the action of a small permanent magnet providing a braking force means that the speed at which the disc rotates is proportional to the voltage and the sum of two current coils multiplied by the Cosine of the phase angle between the voltage and current waveforms (the Power Factor). Now if the neutral is slightly above ground a small current will flow from the supply neutral to the ground rod. BUT this current will be in the opposite direction to which the normal neutral current flows and will tend to turn the disc backwards reducing the reading (and thus the bill). In practice the reverse flow is so small that with no load the torque cannot overcome the 'stiction' in the mechanism and the meter does not move, but even if it did it would move backwards. So no you don't pay for that energy. https://en.wikipedia.org/wiki/Electricity_meter Link to comment Share on other sites More sharing options...
dinga Posted June 20, 2015 Share Posted June 20, 2015 Here's another strange question for Crossy... What is the difference between PEA Meter Types 1125 and 2125 (I've been told the former is OK for the Solar Home programme but the latter - which I have - is not). Seems very odd as my next door neighbour (virtually identical house has a 1125) Link to comment Share on other sites More sharing options...
Crossy Posted June 20, 2015 Share Posted June 20, 2015 Is there any indication of the manufacturer on the meter, that would help identify what the differences are. It's possible that the 2125 has an anti-fraud mechanism that stops it spinning backwards, another reason that you need to be in touch with your supply authority when installing solar, even if not on an export tariff. Link to comment Share on other sites More sharing options...
dinga Posted June 21, 2015 Share Posted June 21, 2015 Am told by the Solar supplier - Meter 1125 = 5-15/45Amp = residential Meter 2125 = 30-45/100Amp = commercial Gawd only nose why our modest bungalow has a commercial meter (wonder if our unit rate is higher?). Will be contacting PEA tomorrow to see if the meter can be changed to Type 1125 in time to participate in the Solar House programme Link to comment Share on other sites More sharing options...
IMHO Posted June 21, 2015 Share Posted June 21, 2015 Where are you seeing the "2125" marking? Link to comment Share on other sites More sharing options...
dinga Posted June 21, 2015 Share Posted June 21, 2015 Cant' see it marked on the meter, but 2125 is shown as the Meter Type on the monthly PEA bill. Link to comment Share on other sites More sharing options...
blackcab Posted June 21, 2015 Share Posted June 21, 2015 If you downgrade your meter ask about the deposit. On our commercial properties we have (if I remember correctly) 200 amp meters. I know for a fact that we had to pay the MEA a refundable deposit of 48,000 baht per meter. I'm not sure if residential properties have to pay a deposit, but it's worth querying to see if you can get a partial refund. Link to comment Share on other sites More sharing options...
dinga Posted June 21, 2015 Share Posted June 21, 2015 If you downgrade your meter ask about the deposit. On our commercial properties we have (if I remember correctly) 200 amp meters. I know for a fact that we had to pay the MEA a refundable deposit of 48,000 baht per meter. I'm not sure if residential properties have to pay a deposit, but it's worth querying to see if you can get a partial refund. Tks - will ask, but no way would have I paid such deposit when they replaced the dead meter a couple of years ago! Link to comment Share on other sites More sharing options...
blackcab Posted June 21, 2015 Share Posted June 21, 2015 Our meters are for apartment blocks and the monthly bill is a bit higher than residential use. I was thinking you might be able to extract enough to cover the cost of a few beers I know it might not be a lot in the scheme of things, but better in your pocket than theirs. Link to comment Share on other sites More sharing options...
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