When a person leaves the electrostatic protection area, is it necessary to change the electrostatic shoes first?
Wearing anti-static footwear (including static footwear and heel grounders) has no effect when walking on non-anti-static floors. So, ideally, taking them off will prolong the life of your static shoes. Dirt is usually insulating.
Therefore according to ESD SP9.2 Appendix B - Foot Grounder Usage Guidelines "Compliance verification should be performed before each use (daily, shift change, etc.). Buildup of insulating material may increase the resistance of the foot grounding system. If the foot is grounded If the device is worn outside the ESD protected area, a functional test should be considered before re-entering the ESD protected area.”