A regular, non-ESD chair cannot be made ESD protective by simply adding a drag chain to ground it. With many chairs the base, wheels, etc are plastic (insulators) and cannot be grounded. To understand this better it important to know what makes a chair an ESD chair:
ESD chairs have four important components:
- A static dissipative fabric or vinyl on the seat and back.
- The seat of the chair is bonded to the gas cylinder, column, and castor base.
- The plunger or vacuum assembly is then bonded to a metal chair ring and or caster base.
- The caster base then uses ESD casters or a drag chain to bond to the ESD floor (ESD chairs must be used with a groundable floor)
Consider ESD chairs, or convert non-ESD chairs with chair covers.