Static-Dissipative and ESD Work Footwear Explained

Electronics assembly technicians, workers in explosive-atmosphere plants, and clean-room staff all wear footwear that looks like an ordinary work shoe but does the opposite job of an EH-rated boot: instead of insulating the wearer from electrical current, it deliberately lets a controlled amount of static charge drain away through the sole and into the floor. Confusing the two categories, or buying one when the job needs the other, is a common and avoidable mistake.

Static-Dissipative vs. Conductive vs. EH-Rated: Three Different Jobs

EH-rated boots are built to resist electrical current passing through the sole, protecting the wearer from incidental contact with a live circuit. Static-dissipative (SD) footwear does the opposite on purpose: it's built with a controlled resistance range that lets a person's body static bleed off slowly and safely into a grounded floor, rather than building up and discharging suddenly as a spark near sensitive electronics or an explosive atmosphere. Conductive footwear goes a step further, offering minimal resistance for maximum, near-instant static drain, used in environments with a serious ignition risk from even a small spark, like explosives handling or certain chemical processing.

Wearing EH-rated boots in a static-sensitive electronics environment can actually be counterproductive, since the insulation that protects against shock also prevents the controlled static drain the environment is designed around. This is why some facilities explicitly prohibit EH-rated footwear on the assembly floor even though the same boots are required elsewhere in the same building for maintenance or electrical work. Reading the actual PPE policy for the specific area, not assuming one boot covers every zone, matters here.

How the Rating System Works

• ESD (electrostatic discharge) footwear: Meets ANSI/ESD S20.20 or similar standards, providing a resistance range low enough to drain static but high enough to still offer some protection against direct current contact. Common in electronics manufacturing and repair.
• Static-dissipative (SD) rated per ASTM F2413: A broader work-boot-focused rating, often layered onto boots that are also steel-toe or composite-toe rated, common in general industrial settings where some static control is wanted without full ESD-standard rigor.
• Conductive (Cd) rated: The lowest-resistance category, for the highest-risk static environments, and notably not appropriate to wear near exposed energized electrical parts since it offers essentially no shock protection.

Why the Flooring Matters as Much as the Boot

Static-dissipative footwear only works as part of a complete grounding path — the boot has to be in contact with a conductive or static-dissipative floor for the charge to actually drain anywhere. A worker wearing a properly rated SD boot on ordinary carpet or a non-conductive floor mat is not getting the intended protection, since there's no path for the static to go. Facilities that specify ESD footwear as policy typically also install ESD flooring or floor mats at workstations, and the two need to be verified together, not assumed to work independently.

Humidity also affects performance meaningfully. Static buildup is worse in low-humidity environments, which is part of why static problems spike in winter in heated buildings, and some facilities test footwear resistance periodically since sole material can degrade or pick up contamination that changes its resistance properties over months of use.

Testing Your Own Footwear

Facilities serious about ESD control test footwear resistance at the door with a floor-and-footwear tester rather than trusting the rating label alone, since wear, contamination, or a worn-through sole can push resistance out of the acceptable range without any visible sign. Workers relying on a pair of ESD shoes for years without retesting may be wearing footwear that no longer performs to spec, particularly if the sole has picked up oil, grease, or has simply worn thin at contact points.

If EH-rated protection is also part of your footwear decision-making for a different part of the job, our guide to EH-rated boots and what the rating actually protects against lays out how that category differs from what's covered here, and it's worth reading both before assuming one boot can serve two very different electrical-safety purposes.