How to choose an ESD workbench that meets the standard

What resistance to ground is compliant?

The most important criterion of an ESD workbench is the resistance from the work surface to the ground point. Per IEC 61340‑5‑1 the resistance to ground (Rg) must sit in the dissipative range between 10⁶ and 10⁹ Ω. Charges then drain fast enough without discharging sensitive components abruptly.

Values below 10⁶ Ω would be conductive and drain charges too abruptly, while values above 10⁹ Ω no longer dissipate charge reliably. The dissipative worktop deliberately hits the compromise in between and limits the discharge current.

How do you ground the bench correctly?

The heart of the setup is the common point ground (CPG). All dissipative elements - table mat, wrist strap, shelving and the operator - are routed in a star to this point and from there connected to the protective earth PE.

A star wiring layout rather than a daisy chain is essential. This keeps the potential of all elements equal so no potential differences arise that could endanger components.

• Mount a ground box or bonding strip as the common point ground on the bench.
• Connect the table mat via snap and a 1 MΩ cable.
• Route the operator's wrist strap to the same point.
• Include metal shelves and dissipative floors.
• Run a single lead from the ground point to the socket's protective earth PE.

What load capacity and features do I need?

Besides ESD safety the bench must carry the mechanical loads. Depending on design, sturdy worktables carry 150 to 1000 kg evenly distributed. For heavy assemblies, power supplies or instruments plan with a reserve.

• Dissipative worktop in HPL or with an ESD surface.
• Height adjustment for ergonomic work sitting and standing.
• Integrated ground box and dissipative power strip.
• Dissipative casters or feet in contact with the ESD floor.

Frequently asked questions