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When working with voltages over 250 VAC, ESD personnel grounding should not be used, rather ionization may be required to neutralize electrostatic charges. Per ESD Handbook ESD TR 20.20 section 5.3.13.6 Other Considerations “For personnel safety, static control garments should not be worn in situations where there is exposure to high voltage.”
As important as ESD control is, it is of secondary importance compared to employee safety. Questions regarding safety should be answered by the facility’s safety officer.
The safety officer and ESD Coordinator should be aware of this information
Per ESD Handbook ESD TR20.20 section 5.3.6.1 Introduction and Purpose / General Information "The primary method of static charge control is direct connection to ground for conductors, static dissipative materials, and personnel. A complete static control program must also deal with isolated conductors that cannot be grounded, insulating materials (e.g., most common plastics), and moving personnel who cannot use wrist or heel straps or ESD control flooring and footwear.
Air ionization can neutralize the static charge on insulated and isolated objects by charging the molecules of the gases of the surrounding air."