How to connect ESD ground cords and accessories?
ESD ground cords connect mats, wrist straps and equipment to the common earth bonding point (EBP), which is bonded to protective earth (PE). The cords usually contain a 1 MΩ safety resistor and connect via snap fastener, banana plug, ring terminal or crocodile clip.
View ground cordsWhat is the common earth bonding point (EBP)?
The common earth bonding point (EBP, common point ground) is the central point where mats, wrist straps and equipment are connected via ground cords. From the EBP a single connection runs to the protective earth (PE) of the installation - so all dissipative elements sit at the same potential.
Which connectors are used for ground cords?
Ground cords come with different connectors for mat, strap, equipment and EBP. The cord for personnel grounding usually contains a 1 MΩ safety resistor; snap fasteners are commonly 10 mm in diameter. The overview below maps connector to use:
| Connector | Use | Note |
|---|---|---|
| Snap 10 mm | mat, wrist strap | common standard size |
| Banana plug | ground box, tester | quick plug-in connection |
| Ring terminal | EBP, screw point | fixed screw fitting |
| Crocodile clip | equipment, tools | temporary grounding |
| Coil cord | wrist strap | with 1 MΩ resistor |
How do you check the ground path?
The ground path from the equipment to protective earth must be checked for continuity regularly. Loose snaps, broken strands in the coil cord or corroded contacts interrupt the drain path - even with the cord visibly connected.
Connects mat or strap to the EBP; the safety resistor limits the drain current.
ViewHow the bonding point fits into the whole protected area is shown in Setting up an EPA. For the personnel side see Wrist strap or heel strap.
Frequently asked questions
Why does the ground cord contain a 1 MΩ resistor?
The 1 MΩ safety resistor limits the drain current through the person and serves personnel safety. It bleeds off static charge slowly enough that no dangerous current flows if the person contacts a live part.
How many connections to protective earth does an EBP need?
Exactly one. From the common earth bonding point a single connection runs to protective earth (PE). Multiple paths can cause potential differences and equalising currents.
How often must the ground path be checked?
Regularly for continuity, especially for ground cords with a moving coil cord. Each check is documented with the reading so interrupted connections are spotted early.
Ground cords and accessories from one source
Ground boxes, cords with 1 MΩ resistor and test equipment - compliant with DIN EN 61340-5-1.
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Grounding to DIN EN 61340-5-1.
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