What is the difference between single-phase meter box and three-phase meter box?

1. The difference in power supply methods. Single phase electricity refers to a form of energy transmission consisting of a phase wire (commonly known as a live wire) and a neutral wire. The power supply circuit composed of two phase lines is called two-phase power supply, abbreviated as two-phase electricity. Three phase alternating current is a form of transmission of electrical energy, abbreviated as three-phase electricity. A three-phase AC power supply is a power supply composed of three AC potentials with the same frequency, equal amplitude, and phase difference of 120 ° in sequence.
2. The difference in voltage levels. Three phase electricity has a phase to phase voltage of 380V. Two phase electricity is 220V. Single phase is 220V, which is the voltage between the phase line and the neutral line.
3. The difference in usage. Three phase electricity is used for supplying power to large equipment such as motors and pumps in enterprises and factories. And they are mostly used for household appliances such as homes, schools, hotels, etc. Single phase electricity, two-phase electricity, and three-phase electricity are collectively referred to as low-voltage three-phase four wire (380V/220V) power supply systems.
4. The difference in the number of wires. Three phase electricity has two more live wires than two-phase electricity, while single-phase electricity consists of one phase wire and one neutral wire, with a voltage of 220V. Only when the three-phase load is the same (such as a three-phase motor), can three-phase electricity be applied. At this time, since the sum of the current vectors of three-phase electricity is 0 (which forms a 120 degree angle with each other, the sum is 0), there is no need for a neutral line (equivalent to a neutral line).