Antistatic vs explosion-proof equipment: two evidence questions
IEC TS 60079-32-1:2013 with Amendment 1:2017 gives guidance on properties and operational requirements used to avoid ignition and electrostatic shock hazards from static electricity. IEC 60079-32-2:2015 provides related test methods. The July 2026 IEC 60079 series listing includes both documents.
The current IECEx standards page says the Part 32 documents may be used for testing purposes but not for issuing an IECEx Certificate of Conformity. Buyers therefore need two evidence sets:
| Evidence question | What can answer it | What cannot answer it alone |
|---|---|---|
| How is electrostatic ignition risk controlled? | Process-specific risk assessment, defined controls and relevant test evidence | An undefined antistatic label |
| Is the exact equipment suitable for the classified area? | Applicable marking, current conformity documents, scope, conditions and instructions | A resistance result, grounding lead or ESD symbol |
1. What does antistatic mean when buying equipment for a hazardous area?
It should identify a defined property or control that reduces electrostatic charging or discharge risk under stated conditions. The word alone is incomplete. Ask what is covered, how it was tested, which acceptance criterion was used and what conditions preserve the result.
IEC TS 60079-32-1 discusses control measures such as earthing conductors, reducing charging and restricting chargeable areas of insulators. A supplier should connect its claim to the relevant control, not use antistatic as a universal safety statement.
2. Is antistatic or ESD-safe equipment automatically explosion-protected?
No. ESD-safe equipment may protect electronic components or people from electrostatic discharge in a defined setting. Hazardous-area equipment must address ignition risk for its intended atmosphere and location. One label does not prove the other.
The MMAIATEX guide on IP66 versus explosion-proof equipment illustrates the same evidence principle: one useful property does not establish the entire Ex protection claim.
3. Does grounding or bonding replace an Ex marking or certificate?
No. Grounding and bonding can be important electrostatic controls, but they do not replace evidence for the equipment's complete hazardous-area suitability. The UK Health and Safety Executive states that earth bonding and antistatic work clothing and footwear can help reduce static-discharge risk. It separately says equipment in explosive atmospheres must be specially designed and constructed to eliminate or reduce ignition risks.
Verify both the bonding design and the equipment evidence. A wire or drawing symbol alone proves neither continuity nor an Ex claim.
4. Why can static electricity become an ignition source?
Charge can accumulate through contact, separation, flow, movement or induction. A sufficiently energetic discharge can ignite an ignitable atmosphere. Risk depends on the materials, geometry, process, atmosphere and controls.
This is why a buyer should not reduce the review to one catalogue adjective. The site risk assessment must address how charge is generated, accumulated and discharged in the actual task.
5. Which control approaches does IEC TS 60079-32-1 cover?
Its public scope identifies recommendations such as earthing conductors, reducing charging and restricting chargeable areas of insulators. It also says the guidance can support an electrostatic-hazard risk assessment or development of product standards.
Use the licensed current document to select the applicable measures. Grounding an insulating part, adding an unverified coating or copying a limit from a different application may not control the actual mechanism.
6. Which properties and tests does IEC 60079-32-2 address?
The public scope lists surface resistance, earth-leakage resistance, powder resistivity, liquid conductivity, capacitance and evaluation of provoked-discharge incendivity. A report should identify the method, specimen, conditioning, setup, result and acceptance basis.
Do not compare numbers from different methods as if they were interchangeable. Ask which requirement the test supports and whether the offered product matches the tested construction.
7. Does one surface-resistance value prove equipment is safe for the application?
No. One value is meaningful only within its method and documented conditions. It does not establish discharge behaviour, grounding continuity, durability or hazardous-area suitability.
Request the complete report or controlled evidence needed for review. Confirm the tested material and construction, conditioning, electrode arrangement, measurement result, acceptance criterion and relationship to the exact offered item.
8. What should buyers verify for plastics, guards, coatings or non-metallic enclosures?
Identify the exact material, formulation, thickness, surface treatment, exposed area and relevant environmental conditions. Cleaning, wear, contamination, humidity, UV exposure or replacement can alter the intended control.
Do not assume that every part made from a similarly named polymer has the same electrostatic behaviour. Match the component and assembly to controlled drawings, test evidence, marking and instructions.
9. Are antistatic clothing and footwear enough to control the whole risk?
No. They can be part of a wider system, but they do not address every charge source, material, container, hose, surface, tool or item of equipment.
The HSE page on electricity in potentially explosive atmospheres presents clothing, footwear and earth bonding as risk-reduction measures. It does not describe them as a substitute for the overall risk assessment or suitable equipment.
10. Do zone, EPL, group and temperature limits still apply?
Yes. Electrostatic control does not remove the need to match equipment to the classified location. Verify the zone, required EPL or category, gas or dust group, temperature class or maximum surface temperature, ambient range and any special conditions.
The MMAIATEX Ex marking guide helps organise those fields. Marking still has to be matched to the exact model and current documents.
11. Which documents and test conditions belong in the purchase request?
Request the legal manufacturer, exact model and revision, item covered by the antistatic claim, requirement, test method, conditioning, results, acceptance criteria and instructions. Separately request applicable Ex marking, conformity documents, schedules, declarations, conditions and installation records.
Use the MMAIATEX guide to verifying IECEx certificates and ATEX documents to check identity, issue, status and scope. A test report and a certificate answer different questions.
12. Who should approve the controls and equipment selection?
The responsible dutyholder and competent professionals should approve the process risk controls and equipment selection under applicable law and the site's management system. Product suppliers can provide controlled evidence, but they do not possess the site's full classification, process and installation context unless that work is explicitly within their scope.
For combustible-dust processes, the MMAIATEX OSHA combustible-dust NEP guide provides employer-document context. It is not an electrostatic assessment or product approval.
A concise buyer decision sequence
- Define the explosive atmosphere, classified area and applicable legal route.
- Identify how static charge can be generated, accumulated and discharged in the real process.
- Select controls using current standards and competent assessment.
- Verify each antistatic claim against a defined property, method and exact product.
- Separately verify the equipment's Ex marking, current documents, EPL, group and temperature limits.
- Control installation, bonding where applicable, inspection, cleaning, maintenance and substitutions.
- Stop the purchase or work when the evidence sets do not match the offered item and application.
Current MMAIATEX certification status
MMAIATEX is the public brand of MMAIATEX Explosion-proof Technology (Zhejiang) Co., Ltd. The public About page states that ATEX, IECEx and CCC certification work is in progress. This FAQ, a photograph, antistatic label, resistance value or grounding feature does not prove that a particular MMAIATEX model is certified or suitable. Verify exact identity, current documents, scope, conditions and destination requirements.
Safety and legal disclaimer
This FAQ is general procurement information, not an electrostatic-risk assessment, test report, certificate, area classification, installation approval or legal opinion. Inadequate static controls or unsuitable equipment can contribute to fire, explosion, injury or death. Use current licensed standards, exact product evidence, applicable law, site procedures and competent professionals. Stop work when the charge mechanism, test basis, bonding integrity, equipment marking or conformity scope is uncertain.
Contact MMAIATEX for a document request
Send the classified area, substance, required EPL, proposed equipment, process materials, static-control plan, environmental conditions, destination and required records so MMAIATEX can organise available product information for competent project review.