Reverse power supply to the air switch

Absolutely not. The static contact must be connected to the incoming wire, while the moving contact should be connected to the outgoing wire.

Do you mean the circuit breaker is reversed? Should we use the lower incoming line? It depends on how you use it. It’s not absolutely impossible; the primary function of a circuit breaker is to provide protection (against overcurrent). Short circuit, missing phase. Low voltage, etc. . There should also be a disconnect switch in the power supply circuit, but nowadays most circuit breakers already have the function of a disconnect switch; therefore, separate disconnect switches are not used in typical power distribution systems. That’s where the problem you mentioned arises. Check if there is a dedicated isolating switch, if so. Inversion should not be a problem (by feel). . It’s absolutely impossible without that. At this time, the circuit is disconnected, but all electrical devices are still powered. It’s just like the function of a socket. Would you dare to touch the sockets casually? ;P

Sometimes, for the sake of easier wiring and better aesthetics, power is introduced from the bottom of the circuit breaker; several of our incoming cabinets are set up this way!

There is some protection, but the safety factor is low; however, this doesn’t matter for circuit breakers in a framework. Otherwise, wouldn’t the busbars become unusable?

Something like this has happened in our company. (Of course, the circuit breaker is different from what you mentioned.) At that time, the power supply was connected from the terminal of the circuit breaker. He wanted to connect a temporary power source; when the circuit breaker was turned off, the contacts on it lost power, which made our staff think that the main power supply had been cut off. As a result, they connected the wires directly below, leading to an electric shock accident. It can be said that he also violated some regulations, but equipment-related issues also contributed to the risk that led to this accident

Frame-type circuit breakers can sometimes be used in this way for the convenience of connecting and disconnecting wires. But attention must be paid to safety considerations: 1. It is best to use cables for the power supply, and all metal parts of the supply lines should be insulated. 2. Proper labeling is necessary

There are some security risks associated with doing this, so be careful! ! ! It is recommended not to feed power in reverse.

Is it with power entering from below, or with the vacuum circuit breaker having power entering from below and exiting from above?

Normally, the power cable should be connected to the static contact, while the load cable should be connected to the moving contact. If the power cord is connected to the moving contact, it increases the risk of electric shock for personnel during operation.

Do not neglect safety just for the sake of easy wiring or aesthetics; human lives are at stake.

Theoretically, there is no issue with the direction, but generally it is necessary to follow the pattern of moving from top to bottom, as this is the established way of thinking for most people; moving from bottom to top is firmly opposed~~

Safety issues should still be given top priority; violating regulations constitutes a potential hazard for accidents. Even if it is feasible from an electrical perspective, an accident may occur if someone new takes over.