When choosing an energy meter, the selection of the current value is the most important and the most complicated. One is the starting current, that is, the minimum current that can turn the turntable continuously; the second is the multiple of the maximum rated current relative to the basic current.

In addition, there are differences in performance between old-fashioned and new-style watches. The old electric energy meter still in use in the old house has a relatively large starting current, generally (5% to 10%); the maximum rated current is small, generally ≤2, and only one current value is marked on the dial surface of the dial, and is generally called Rated current.

According to the energy meter produced by the national standard GB/T15283-94 and the international standard IEC521-1988, the starting current of the energy meter used in the newly built house is small, which is 0.5% for the level meter; the maximum rated current is large, and the general maximum rated current is ( 2～4), some can reach (6～8).

There are two current values ​​marked on the surface of the new energy meter dial, such as 5 (20A). On the one hand, when choosing this energy meter, it should be noted that the minimum current of the load cannot be lower than the starting current, that is 0.5%×≥5A=0.025A; On the other hand, the value of the ammeter used for a long time cannot be higher than the maximum rated current value of 20A.

When choosing an electric energy meter, one should consider the increasing number of electrical appliances entering the home. It is necessary to leave a margin, and it must be reasonably appropriate, because the larger the multiple, the higher the price of the meter.

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