Code: EH-01 · ESD heel strap with 1 MΩ resistor, plus ground cord EG-3S. Also called “Leko heel strap”, “heel grounder”, “ground cord with stud and clip” or “ESD mat ground cord” — the difference: sold as a grounding kit (strap + cord + grounding point + tester) with a grounding diagram, tested per lot. Stock in Ho Chi Minh City, delivery 24–48 h.
The heel strap connects the heel of an ordinary shoe to an ESD floor or mat through a conductive tab worn inside the sock, with a 1 MΩ resistor — for staff who move around (inspection, repair, materials) and cannot wear a fixed wrist strap. The ground cord connects rubber mats, worktops and grounding points to the common ground point; the 10 mm stud end fits the mat stud, the other end is an alligator clip or an M4 ring terminal.
How it works: walking constantly charges the body as the soles touch and separate from the floor. The heel strap creates a continuous path — skin/sock → conductive tab in the shoe → conductive rubber heel cup → ESD floor → factory earth — so charge drains whenever that foot touches the floor. That is why Desco recommends a strap on each foot for mobile staff: at least one foot is always grounded.
Specifications
- Heel strap material: conductive rubber heel cup + carbon textile tab, hook-and-loop fastener
- Heel strap resistance: 1 MΩ ± 10 %
- Heel strap contact: conductive tab, 1-wire / 2-wire
- Heel strap requires: ESD floor or mat (ANSI/ESD STM7.1)
- Heel strap standards: ESD SP9.2, ANSI/ESD S20.20
- Ground cord: copper core, PVC sheath, 3 m (1.5 / 5 m optional)
- Ground cord resistance: 1 MΩ in the stud end (0 Ω option for bench bonding)
- Ground cord ends: 10 mm stud + alligator clip (EG-3K: 2 clips; EG-N10: 10 mm stud both ends)
- Ground cord requires: ground point < 1 Ω; standard ANSI/ESD S6.1
- Checks: heel strap — footwear/wrist strap tester at the start of each shift; ground cord — continuity check at installation
- Packing: 1 pc/bag · 100/carton (strap and cord)
- MOQ: 10 straps / 10 cords
How to choose
- Seated operators → wrist strap (EW-18).
- Staff moving around an EPA with an ESD floor → heel strap (this product), ideally on both feet.
- Bench mats and ESD shelving → ground cord with stud and clip (EG-3S).
- Bench-to-bench bonding to the common ground point → 2-clip cord without resistor (EG-3K-0).
SYSTEM REQUIREMENT: a heel strap does not ground anyone on its own — it is half of the footwear–floor system. Per ESDA, when this system is the operator grounding method it must meet both limits together: person + heel strap + floor resistance to ground < 1×10⁹ Ω (ANSI/ESD STM97.1) and walking body voltage < 100 V (ANSI/ESD STM97.2). Contact resistance between sole and floor dominates, so each heel strap/floor combination should be evaluated in practice. Related ESDA documents: ESD SP9.2 (foot grounders), ANSI/ESD STM7.1 (flooring), ANSI/ESD S6.1 (grounding).
TESTING: resistance tested per lot; grounding diagram supplied: mat → 1 MΩ cord → grounding point → common ground point → factory earth. Daily: before entering the EPA, stand on the tester plate and test each foot separately, log the result; if it fails, reseat the tab and retest, then replace the strap. Re-test the floor after polishing or waxing. Per ESDA, the preferred common ground is the equipment ground (PE) conductor.
COMMON MISTAKES: wearing heel straps on ordinary epoxy, ceramic tiles or carpet (no path to ground — an ESD floor such as FT-6620 is needed); one strap only for staff who walk a lot; the tab outside the shoe or on a thick insulating insole; using heel straps instead of wrist straps for seated operators — ANSI/ESD S20.20 requires seated operators at ESD workstations to use a wrist strap (EW-18).
FAQ
- Can heel straps be used without an ESD floor? — No; without a conductive floor there is no path to ground.
- One foot or both? — Both, so one foot is always on the floor while walking; Desco recommends a strap on each foot for mobile staff.
- Ground cord with or without resistor — when to use which? — Mats and items people touch → with 1 MΩ; metal frames to ground → 0 Ω.
- Where is the common ground point taken from? — An earth rod or the PE conductor of the electrical system, measured < 1 Ω; PRIMEAG surveys and draws the diagram.
REQUEST A QUOTE: send the number of mobile staff and the number of benches/mats — PRIMEAG puts together the grounding kit and diagram and quotes within 30 minutes.
Hotline/Zalo +84 906 108 292 · info@primeag.vn
Written by the PRIMEAG technical team.