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Grounding Through Contaminated Surfaces
Dirt or paint on the contact surface of a floor or portable conductive object can increase resistance to earth enough to allow hazardous electrostatic charge on the object.
This warning comes from IEC TS 60079-32-1, section 13.3.1.4, as quoted in Newson Gale’s Grounding & Bonding Applications, Issue 4.
Alternative grounding when contamination is expected
- Source
- IEC TS 60079-32-1
- Connection
- 10 Ω recommended
Where contamination is expected to raise leakage resistance to an unacceptable value, the quoted IEC passage says the object should be earthed by an alternative means, such as an earthing cable. It recommends a connection resistance of 10 Ω between the cable and the item being earthed.
Clamp contact on coated equipment
- Source
- Newson Gale
Newson Gale separately advises ensuring that grounding-clamp teeth penetrate to the object’s base metal where product deposits or coatings cover its surface.
For the broader inspection and verification duties, see ground monitoring in hazardous areas.
Frequently Asked Questions
Yes. IEC TS 60079-32-1, section 13.3.1.4, as quoted in Newson Gale’s Grounding & Bonding Applications guide, Issue 4, says dirt or paint on the floor or object contact surface may raise leakage resistance to an unacceptable value and allow hazardous electrostatic charge on the object.
The passage quoted in Newson Gale’s guide says the object should be earthed by an alternative means, such as an earthing cable, when an increase in leakage resistance from contamination is expected. It recommends a connection resistance of 10 Ω between the cable and the item being earthed.
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