Single-phase watt-hour meter is a kind of watt-hour meter. The main structure of watt hour meter is composed of voltage coil, current coil, turntable, rotating shaft, brake magnet, gear, meter and so on. Single-phase meters are generally residential and connected to 220V devices. So let's take a look at how to choose a single-phase meter and the precautions for installation.

I. How to choose a single-phase electric meter?

1. Determination of the type of single-phase electronic meter:

The existing single-phase meters in the market are mainly classified as single-phase electronic meters, single-phase prepaid meters, single-phase multi-rate meters, single-phase electronic carrier wave meters and so on. It is necessary to determine the basic type requirements when choosing. 

2. current and other basic choices of Single-phase meter:

The common current specifications of single-phase meters are 5(60)A, 10(60)A, 20(80)A. When selecting the meter current, it is necessary to consider that it cannot be lower than the basic current, and also cannot be higher than the maximum rated current. Such as, 350W computer, 300W TV, 1800W air conditioner, 400W refrigerator and other household basic electricity demand with about 200W. Then we can calculate the current = (350 + 300 + 1800 + 400 + 200) W / 220V ≈ 13.9A. Taking into account the need to increase appliances in the future, it is recommended to choose 10 (60) A electric meter.

II. Single-phase meters should be installed with the following in mind:

Check whether the lead printing sealed on the two ears of the meter cover is complete. After the energy meter is installed, close the disconnecting switch and turn on the light to check.

The meter should be installed in a dry and stable place, avoiding direct sunlight, humidity, heat, mold, smoke, dust, sand and corrosive gases. The position should be installed correctly. If there is a significant tilt, it is easy to cause inaccuracy, stop-and-go or empty walk and other problems. It should be installed higher, but it should be easy to read the meter.

It must be wired according to the wiring diagram, while paying attention to tighten the screws and tighten the small hooks inside the junction box.

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