Generally, three-phase equipment is not connected to the neutral line, but the shell must be reliably grounded, which is very important, because it is to protect human safety and trip in time when equipment problems occur, so as to avoid heavy losses.

Basic principle, connection mode and matters needing attention of three-phase electricity;

If the motor is connected, the primary and protection control should be realized through circuit breakers, contactors, protectors, soft starters, frequency converters, etc. See the picture for the connection of motor windings.

Other loads send out three-phase 380V power supply, which can provide 220V power supply through the neutral line, and only two phases can provide 380V power supply, so choose according to the load needs.

When three-phase electricity is connected, the motor may reverse due to the phase sequence, so it is enough to adjust two phases at will.