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Floor and Person-to-Earth Limits
TRGS 727 sets separate resistance requirements for the floor and for the person-to-earth path. Although the limits below use the same magnitude, 100 megohms (100 MΩ or 10⁸ Ω), the measured paths and strict versus inclusive limits differ.
This guide covers the January 2016 edition of Germany’s technical rule on avoiding ignition hazards from electrostatic charging, corrected July 2016.
Resistance limits and where they apply
- Limit
- 100 MΩ (10⁸ Ω)
- Sections
- 7.1(1), 8.2(1), 8.2(5)
| TRGS 727 section | Requirement | Where it applies |
|---|---|---|
| 7.1(1) | Dissipative footwear; person-to-earth leakage resistance at most 100 MΩ (≤) | Zones 0, 1, and 20; Zone 21 where dust has a minimum ignition energy (MIE) of 10 mJ or less |
| 8.2(1) | Dissipative flooring; floor-to-earth leakage resistance below 100 MΩ (<) | Zones 0, 1, and 20; Zone 21 where dust has an MIE of 10 mJ or less |
| 8.2(5) | Floor leakage resistance at most 100 MΩ (≤) | Areas endangered by explosive substances or mixtures |
The person-to-earth value is not a resistance measurement of footwear alone or flooring alone. Likewise, the inclusive limit in section 8.2(5) does not change the strict dissipative-floor definition in section 8.2(1).
Acceptance method and installed-floor testing
- Source
- Note to 8.2; Annex H
A note in section 8.2 says the tender should identify the acceptance test method and maximum values before delivery and installation, because different floor-resistance test standards and methods can be used.
Annex H recommends testing the installed covering even when certificates exist for the uninstalled product. See installed-floor testing under TRGS 727 for that distinction.
Installation and maintenance conditions
- Section
- 7.2
Section 7.2 requires floors in explosive-atmosphere areas to prevent hazardous charging of people wearing dissipative shoes. Its note points to floors conforming to section 8.2.
- Contamination and insulation: Avoid paint or oil residues and unintended insulation from items such as film or empty containers placed on the floor.
- Adhesives: Glued floor coverings need sufficiently conductive adhesives.
- Inadequate dissipation: Special measures are required to bring floor leakage resistance below 100 MΩ. Keeping the floor moist is an example, not a universal remedy.
- Floor-care products: They must not increase the floor’s resistance.
A separate provision addresses a limited insulating-floor exception at rarely used tanker filling points.
For the broader inspection context, see grounding continuity and testing under TRGS 727.
Frequently Asked Questions
No. In Zones 0, 1, and 20, and Zone 21 for dust with MIE of 10 mJ or less, section 7.1(1) requires dissipative footwear with person-to-earth resistance at most 100 MΩ. Section 8.2(1) requires a dissipative floor with floor leakage resistance strictly below 100 MΩ. These are different measured paths and different inequalities.
Section 8.2(5) sets an inclusive maximum of 100 MΩ for floor leakage resistance in areas endangered by explosive substances or mixtures. The dissipative-floor definition in section 8.2(1) instead requires a value strictly below 100 MΩ.
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