Will coal dust conduct electricity if it is exposed to air for a long time?
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As can be seen from the diagram, the wiring terminals at the site are connected directly without any dust protection; as a result, an alarm is triggered after the machine has been running for about a week. After the power is cut off and then restored, the machine can operate normally again, but its operational life is generally only around a week. The gray substance on the terminals is coal dust; it is now suspected that this coal dust has absorbed moisture from the air, thereby gaining conductivity and causing a short circuit. As a result, the machine’s protection system was activated, triggering an alarm.
Have you ever encountered this situation?
This is very likely. So dust protection is needed.
This post was last edited by 1111111 on 2018-1-27 at 11:29. Coal, right? Coal powder doesn’t absorb moisture or humidity; it’s flour and dust that do. When I was a kid, I saw a lot of briquetted coal being made – adding water to the coal powder wasn’t effective; soil had to be added appropriately, otherwise the briquettes wouldn’t stick together and wouldn’t take shape. I don’t know whether coal powder is conductive or not. . . Stop guessing. If there’s really a short circuit, then it will remain in that state. If an alarm is triggered, then it will keep sounding. It won’t happen that once the power is turned back on, the short circuit is resolved and the alarm stops sounding as well. Otherwise, it would be truly amazing! {:2_32:}
Coal dust is virtually non-conductive, with very poor electrical conductivity; as a result, the machines stop working after just one week of operation. I wonder whether this accumulation of coal dust reaches a certain level over time – after about a week – which then enables electrical conduction and leads to the machine stopping working
Coal dust is generally non-conductive, but it reduces the creepage distance. When this distance becomes too small, inter-phase short circuits or arc flash faults can occur; this is why dust must be removed promptly in power supply systems and distribution cabinets
Stop joking – the resistance value of coal dust is lower than that of air. As for whether it conducts electricity or not, it depends on the voltage applied; in any case, I think carbon rods have reached their limit. As for coal dust, whose composition is similar to that of carbon rods, there shouldn’t be much difference. Finally, sir, if there is coal dust, it must be exposed to the air. It’s not known whether coal dust conducts electricity, but rainwater definitely does.
This post was last edited by qugd on 2018-1-30 at 15:49. Coal powder has a certain degree of electrical conductivity, especially anthracite, which, due to its high carbon content, has a conductivity similar to that of conductors. Lignite and bituminous coal have lower electrical conductivity, but they are not insulators either; they are similar to semiconductors. However, they absorb water more readily than anthracite, so they may also conduct electricity in humid environments. Those who say that coal dust is non-conductive should take a close look at the physical properties of coal. Based on its resistivity, coal is a conductor or semiconductor; it is definitely not an insulator. For electrical wiring in a coal dust environment, it is advisable to use protective sleeves or dust-proof wiring boxes/cases to ensure safety. Furthermore, coal powder is flammable and constitutes a risk factor as well. Take a look at the information for the New Year: