Where dust is being sucked up, there is a chance that static electricity will be generated. This is caused by dust rubbing against the inside walls of, for example, a vacuum hose or filter thereby creating friction. This friction gives the dust a different electrical charge than the surface on which it rubs. The extent to which static electricity is built up highly dependents on the material being sucked up. For example, sucking up plastic chips generates more static electricity than, for example, your ordinary wood chips. From a safety point of view, it may sometimes be necessary to reduce or prevent the build-up of static electricity. For instance, when dust is sucked up that is highly flammable or when dust is being sucked up in rooms with combustible fumes.
The build-up of static electricity can easily be prevented by grounding those parts that can generate static elecricity:
- A dust bin made out of steel can easily be grounded.
- A metal cyclone filter can also be easily be grounded.
- Some vacuum hoses have a copper spiral inside them that can be grounded. We have a 58mm (outer diameter) polyurethane vacuum hose with a copper spiral.
If you already have a vacuum hose but it hasn’t got a copper spiral inside it, you can make one yourself by letting a very thin metal wire (without its insulation) run through the entire length of the hose. Where the hose connects to the side inlet/outlet of the filter, you can ground that end of the metal wire. You can secure the other end of the wire by unscrewing the nozzle from the hose and then letting the metal wire run back a few centimeters onto the outside of the vacuum hose. If you then screw the nozzle back on, the wire is pinched between the outside of the hose and the inside of the nozzle. Please note: the 35mm nozzle of the ready-made vacuum hose is glued and therefore cannot be unscrewed for pinching a metal wire. We also use the ready-made vacuum hose and experience very little static electricity when extracting wood chips and saw dust.
For more information about static electricity and how it can be prevented, you can consult the following information:
Specifications for static electricity (work protocol).
Whether you need to ground your cyclone filter system or not depends on your specific situation. For example, we do not ground our filter systems and do not experience any problems with static electricity other than some fine wood powder dust (router dust) sticking to the inside and outside of the dust bin. If you want to be sure, we recommend that you ground your complete cyclone filter system.
Do you have any questions? Most answers can be found on the FAQ page. Can’t find the answer? Do not hesitate to contact us via our contact page.