Andy has already covered the standards side really well, so I’ll just add a practical perspective.
For Case 1, simply touching a PCB by hand is not automatically an ESD violation if the operator is working within a properly qualified EPA. If the footwear/flooring system has been validated, the operator is wearing compliant ESD garments where required, and the grounding system is regularly verified, then handling the edges of a PCB by hand is a common and accepted practice. Of course, from a product quality standpoint, it’s still good practice to avoid touching component leads or contact pads because of contamination from skin oils and residues.
Regarding footwear, it’s easy to think of shoes as an insulator, but ESD footwear isn’t relying on the sole material alone. The complete path—from the body, through socks, footwear, and into the ESD floor—is what matters. That’s why periodic footwear testing is so important. A footwear/floor combination that passes qualification testing has already demonstrated that it provides an acceptable path for charge dissipation under normal working conditions.
For Case 2, I’d be cautious about counting every manual PCB transfer as an ESD violation. Instead, I’d separate actual non-conformances from potential risk factors. For example:
- An operator seated without the required grounding method would generally be considered a non-conformance.
- An operator carrying a PCB by hand within a qualified EPA while using a verified footwear/flooring system would typically be considered acceptable practice rather than a violation.
If you’re trying to correlate ESD practices with PCB failures, you’ll usually get more meaningful results by focusing on failures to follow the documented ESD control program (missing wrist strap where required, failed footwear tests, ungrounded workstations, damaged work surfaces, etc.) rather than simply counting every instance of direct PCB handling.
One thing that’s often overlooked is that ESD control is about managing risk, not eliminating every possible source of static. A well-designed EPA uses multiple layers of protection—grounding personnel, grounded work surfaces, ionization where needed, shielding during transport, and regular compliance verification. Looking at the whole system usually provides a much clearer picture than evaluating a single action in isolation.
If you’re interested in practical guidance beyond the standards themselves, there are also some useful technical articles from ESD equipment manufacturers, including Bondline, that explain the reasoning behind common EPA practices in a more application-focused way. They can be a helpful complement to the ANSI/ESD standards when you’re trying to understand the “why” as well as the “what.”
I’m looking to improve my understanding of ESD safety practices and procedures. I have a few questions and would greatly appreciate your insights:
