Why is the new national standard "Electrical Safety Regulations (Substation Part)" revised to only hang the sign "No closing, someone is working" on the handle of the disconnector, and there is no cir

Why is the new national standard "Electrical Safety Regulations (Substation Part)" revised to only hang the sign "No closing, someone is working" on the handle of the disconnector, and there is no circuit breaker? Because many disconnectors are manual, there is a danger of human error closing, so the maintenance equipment should hang a sign "No closing, someone is working" on the handle of the disconnector.

The operating fuse and power fuse of the circuit breaker have been removed during power failure, and there is generally no misoperation. Moreover, there are disconnectors on both sides of the circuit breaker as disconnection points, so there is no need to hang signs on site.