- Reaction score
- 13,478
I presume the bench is not earthed now i.e. there is a very high resistance between it and earth, such as if it stands on plastic feet or a dry plastic floor. If they are getting shocks when touching it specifically after walking across the floor, it must be the people getting charged and then discharging themselves to the stray capacitance of the bench when they touch it. If that is the case, then neither a resistive connection to earth nor a solid bond will prevent the shocks as the stray capacitance will still be there, it could make them worse as the bench will discharge faster through the bond.
The only situation in which a 1MΩ earth strap on the bench would help is if it is the bench charging up, e.g. if there was compressed air / powder handling equipment on it generating a triboelectric charge, and then shocking the people.
It sounds like the floor needs treatment.
The only situation in which a 1MΩ earth strap on the bench would help is if it is the bench charging up, e.g. if there was compressed air / powder handling equipment on it generating a triboelectric charge, and then shocking the people.
It sounds like the floor needs treatment.