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Coating-Area Grounding Requirements
TRGS 727 requires separate grounding measures for people, conductive equipment, and conveyor workpieces in spray-painting, powder-coating, and flocking work areas. A dissipative floor and footwear combination is one way to ground the painter; it does not replace the other grounding requirements.
This guide covers section 5.5 of the German technical rule on avoiding ignition hazards from electrostatic charging, January 2016 edition, corrected July 2016. For the broader context, see ESD flooring in hazardous areas.
People and gloves
- Gloves
- At least dissipative
The painter must be grounded during both coating and cleaning. TRGS 727 gives two examples:
- Conductive, grounded spray-gun handles.
- Dissipative footwear used with dissipative floors.
Gloves used in the spray-painting, powder-coating, and flocking work area must be at least dissipative. Other people in the work area must also be grounded.
Equipment and conveyor workpieces
- Workpieces
- Grounded throughout transport
All conductive objects in the work area must be grounded, including spray guns, workpieces, and nearby metal objects.
Workpieces transported by conveyor must remain grounded throughout the entire transport through conductive holding devices, such as hooks, eyes, supports, or drivers. TRGS 727 gives regular cleaning of those devices as an example of maintaining that grounding path.
Spray booths for electrostatic liquid coating
- Materials
- Dissipative or grounded conductive
For electrostatic coating with liquid paints, TRGS 727 recommends using only spray booths, spray walls, or spray stands made of dissipative material or grounded conductive material.
Insulating materials are permitted only when dangerous charging is excluded.
Why grounding matters
Spraying liquid or powder paints and flocking can create clouds of droplets or solid particles that are often electrostatically charged and flammable. TRGS 727 identifies the resulting ignition hazard as the reason for these measures. Charging is particularly relevant when deliberately generated by high voltage or triboelectrically.
Frequently Asked Questions
No. Section 5.5 requires the painter to be grounded during coating and cleaning. Dissipative footwear combined with a dissipative floor is one listed example; conductive grounded spray-gun handles are another.
They must be at least dissipative. Section 5.5 applies this requirement to gloves used in the spray-painting, powder-coating, and flocking work area.
For the spray-painting, powder-coating, and flocking operations covered by TRGS 727 section 5.5, workpieces on a conveyor must remain grounded throughout the entire transport through conductive holding devices. Regular cleaning of those devices is the rule’s example of maintaining that path.
No. TRGS 727 recommends dissipative or grounded conductive spray booths, walls, or stands for electrostatic coating with liquid paints. It permits insulating materials only when dangerous charging is excluded.
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