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star apple
A carpenter was grinding the concrete in the wall and the room so full of dust. Then the TV channel box malfunctioned.. is it possible cement dusts can become conductor when they covered the circuit board?
It looks like dry concrete is not very conductive:star apple said:A carpenter was grinding the concrete in the wall and the room so full of dust. Then the TV channel box malfunctioned.. is it possible cement dusts can become conductor when they covered the circuit board?
Nik_2213 said:Another possibility is the grinder, if electric rather than internal-combustion,
Baluncore said:The rapidly changing current shows that it had a channel change button held down. That button might be on the front of the box and have been pressed against something temporarily. The button might have been on the remote control, where was that? did it have dust on the buttons? Did it have capacitive touch keys?
Soot is carbon. It's conductive.star apple said:Can burning soot from any material be conductive.. because once an electrician was trying to live wire a circuit breaker.
Nugatory said:Soot is carbon. It's conductive.
Yes. If you burn any carbon based polymer you get carbon soot. Carbon was used as electrodes in batteries and as carbon arc lights. Carbon is added to some materials to prevent build up of static electricity.star apple said:can soot from none-conductive plastic become conductive?
Baluncore said:Yes. If you burn any carbon based polymer you get carbon soot. Carbon was used as electrodes in batteries and as carbon arc lights. Carbon is added to some materials to prevent build up of static electricity.
The Frame, also known as the molded case, provides an insulated housing to mount to mount all of the circuit breaker components. This will often be made of a glass-polyester material or thermoset composite resin that combines ruggedness and high dielectric strength in a compact design.
CWatters said:Google found...
https://www.galco.com/comp/prod/circ-mold.htm
A lot of wire has PVC based insulation (contains carbon) but there are others..
https://www.performancewire.com/insulated-wire-protection/
A spring loaded carbon brush carried the HT spark from the ignition coil to the rotating button with the wiper arm at the centre of the distributor.Wes Tausend said:Once in a while, after just a few thousand miles, the correct path to the cylinder developed a high resistance from some wear process, perhaps a defective wire or across the eroded spark plug gap itself.
Baluncore said:A spring loaded carbon brush carried the HT spark from the ignition coil to the rotating button with the wiper arm at the centre of the distributor.
The rotating wiper in the distributor did not touch the plug electrodes, the spark had to jump a narrow gap before it reached the wire that carried it to the spark plug. Sometimes it preferred some other route across a contaminated surface or along a crack that held moisture, to another plug or the chassis.
In later models, a bundle of carbon fibres replaced that wire. That had sufficient resistance to suppress oscillations, and so reduced radio frequency interference from the spark plug and wire, which otherwise was, effectively a Lecher Line oscillator.
The original metallic wires and spark gaps made a Lecher Line oscillator. The resistive carbon eliminated that source of RFI.Wes Tausend said:I'm afraid I don't quite yet understand using the Lecher process in this regard.
Correct. But your term “half dipole antenna” may be confusing. The spark plug wire is a dipole at all frequencies. It is only a half-wave dipole at one frequency.Wes Tausend said:Does that sound about right?
Yes, cement dust can cause electrical malfunctions. When cement dust accumulates on electrical equipment, it can create a conductive layer that can cause short circuits and other electrical issues.
Cement dust can affect electrical equipment in several ways. It can create a conductive layer that causes short circuits, block ventilation and cooling systems, and corrode sensitive electronic components.
To prevent cement dust from causing electrical malfunctions, it is important to regularly clean and maintain electrical equipment in areas where cement is being used. The use of protective covers and enclosures can also help prevent dust accumulation.
Yes, it is important to follow safety precautions when working with cement around electrical equipment. This includes wearing appropriate protective gear, using dust control measures, and following proper cleaning procedures to prevent dust from accumulating on equipment.
Yes, if left unaddressed, cement dust can cause long-term damage to electrical equipment. It can lead to corrosion and premature wear of components, which can result in costly repairs or replacements.