Home circuit, is there electricity when the main gate is closed?

Hello. If you think that the main brake is the main incoming switch and the socket switch is just a sub-brake under the main brake, there is only one possibility, that is, the main brake only closes one line, and this line is the zero line, but the live wire is not closed.

The main door is the main switch of the home circuit. If the main brake is pulled down, the whole house should be dead. For normal circuit installation, the master switch must be a 2p switch, that is, a circuit breaker that can cut off the neutral line and live wire at the same time. If only one line is cut off, it is unqualified.

If the main switch is a 2p circuit breaker, electricity can still be measured when the main switch is closed, then the main switch is broken and must be replaced.

If the main brake is a 1p circuit breaker, it can be determined that the main brake controls the zero line, not the live line, so the installation is unqualified. 1p circuit breaker can only be installed on the disconnection line, and it must be the control fire line. The master brake must be replaced by a 2p circuit breaker, and the zero fire line can be controlled at the same time.