It is not allowed to connect them together. The power outage may be due to maintenance work. Once the neutral line is connected, the voltage will be grounded. generated on the neutral line. Workers are in danger. If it is a dual feed, a four-wire breaker should be used and the neutral line should be completely shut off. This four-wire circuit breaker is specifically designed for dual feeds.
The ground wire cannot be used as a neutral wire.
First of all, you should know that the ground wire and the neutral wire are completely different concepts. The ground wire is only for protecting electrical devices and no current will flow through it normally. According to national regulations: The shell of household appliances must be connected to a ground wire. When the device leaks electricity, the ground wire will conduct current to ground, protectingthus the human body and avoiding electric shock.
The neutral wire is one of the power lines. Since household appliances are all single-phase, in a single-phase power supply, the neutral line serves as the current loop, and the current from all appliances flows through it and then back to the generator (transformer). Therefore, the ground wire should not be used as a “neutral wire”. If the zero and ground wires are mixed, it is very easy to cause frequent malfunctions due to missing protection, which is very dangerous.