The wires are all burned. Why didn't the circuit breaker trip?
The function of the circuit breaker is to automatically break the circuit when overload, short circuit and voltage loss exceed the allowable limit, and to make and break the circuit infrequently under normal conditions.
The function of the wire should be able to carry the needs of the maximum load current, and should be able to resist a certain mechanical tension, can withstand a certain voltage.
The problem now is that the wires are burning and the circuit breakers are not tripping. Accordingly, the analysis is as follows:
First, the current carrying capacity of the wire is used incorrectly.
The selection of wires is generally in line with safety, correctness, resistance to mechanical tension and other elements.
The safe carrying current of the wire should generally be greater than 1·5 times the rated current of the electrical load.
Different wires should be selected according to the different wiring of the device. Such as plastic sheathed wire, plastic cable, single strand, multi-strand plastic copper core, aluminum core and other wires.
Different wires should also be selected according to different places. Such as dust, high temperature, humidity, cultural entertainment venues, stages, etc., have different requirements.
The selection of wires should preferably meet the national standard of the wire.
Electrical installation must be clear electrical requirements, must know the maximum rated current of electricity in order to correctly select wire specifications that meet the requirements.
Second, the rated current of the circuit breaker is selected incorrectly.
In the case that the circuit breaker does not trip because the wire has burned due to heat, it indicates that the rated current of the circuit breaker is selected incorrectly. In the circuit, the circuit breaker is the main power switch.
The general selection principle of the rated current of the air switch is 1·2 times the total current of the line electrical appliances. When the selection is large, the time-space opening and breaking of the line will delay or even refuse to move.
It doesn't work. Select a small switch can not withstand the large current will trip affect normal use. The selection of air switches should also pay attention to the adaptability of the site. The adaptability of the rated current size should be considered in the selection of air switches.
Different air switches are selected in terms of breaking capacity sensitivity and fast action.
Third, there may be irregularities in the line device.
It should be properly installed in the line. Follow the electrical 彽 voltage regulations for electrical installation as required. And the inspection should also comply with the requirements of low regulations to ensure safety.