Precautions for the Connection Method of the Electric Meter

1. The meter wire of the low-voltage electric energy meter adopts an insulated copper core wire with a rated voltage of 500V. The current carrying capacity of the wire matches the load, and the cross-section of the wire is not less than 2.5 square millimeters.

2. The laying of plastic insulated wires should be laid by wire code, plastic groove plate or plastic pipe.

3. The phase sequence of the three-phase three-wire and three-phase four-wire electric energy meters should be marked with yellow, green, and red wires to mark the phase sequence, or yellow, green, and red colors should be painted on the wires to separate the phase sequence. If the neutral wire is black, then no color is applied.

4. When connecting the primary line of the low-voltage current transformer, pay attention to the number of turns and joints of the marked transformation ratio, and the meter line should be crimped to the lugs.

5. The wiring of the watt-hour meter should be based on the drawing attached to the meter and the wiring diagram on the back of the meter cover. This is for the new meter. Be especially careful with old watches, the wiring diagram on the back of the cover may be inaccurate, because you don't know whether the cover is original to the watch, or it may have been accidentally replaced. For the sake of safety, use a multimeter to actually measure it to find out the terminals connected to the current coil and the voltage coil. Generally, the resistance of the voltage coil is 700-800 ohms, and the resistance of the current coil is 0 ohms. Failure to do this step may result in a short circuit failure.

6. When connecting a three-phase four-wire watt-hour meter with a current transformer, the three-voltage coil connecting pieces on the watt-hour meter should be removed, otherwise it will cause a short circuit.

7. The polarity of the current transformer must be connected correctly. When the wire of the main circuit passes from the P1 end to the P2 end, the k1 of the secondary side of the transformer should be connected to the 1, 4, and 7 terminals of the watt-hour meter respectively, and the k2 should be connected to the 3, 6, and 9 terminals respectively. If k1 and k2 are all reversed, either do not rotate (the watt-hour meter with a non-return device), or reverse (the watt-hour meter without a non-return device). If only one or both of them are reversed, the watt-hour meter will measure less electricity.

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