Page review information
Edition covered
IEC 60079 · NEC Art. 500–505 — n/a — routing page; editions are recorded on the child standard pages
Content status
Review pending
Coverage
Family landing page for explosive-atmosphere standards; routing and scope summary only. The Zone-vs-Division framing was corrected in August 2026 to stop presenting the Zone system as certificate-driven; that correction is not author-reviewed.
Last content update
August 2026
Technical validation
Not yet completed
Primary reference
The official published standard — required for final decisions

Confirm the governing edition, jurisdiction, and project-specific requirements before applying anything on this page.

Standards Family

Hazardous Area Electrical Standards

Hazardous area standards govern electrical equipment and installations in locations where flammable gases, vapors, dusts, or fibers may be present. Two parallel systems exist — the IEC Zone system (international) and the NEC Class/Division system (US).

Classification Systems

System Standard Zones/Classes Used In
IEC Zone (gas) IEC 60079-10-1 Zone 0, 1, 2 International, US Art. 505
IEC Zone (dust) IEC 60079-10-2 Zone 20, 21, 22 International
NEC Division (gas/dust) NEC Art. 500–503 Class I/II/III, Division 1/2 US (traditional)
NEC Zone (IEC-aligned) NEC Art. 505–506 Zone 0/1/2, Zone 20/21/22 US (IEC-aligned)

Both systems are valid in the US for a Class I location — OSHA’s 29 CFR 1910.307 permits either. The choice is about which classification vocabulary an installation uses; a project whose classification drawings and equipment population are already IEC-based avoids a translation step by using the Zone system (NEC Art. 505).

That choice does not settle equipment approval. An ATEX or IECEx certificate is evidence about a product’s protection concept under its own scheme, not a US approval — US workplace equipment normally needs certification, listing, or labelling by an OSHA-recognised NRTL. See the approval boundary.

Standards in This Family

Standard Scope Corpus Status
IEC 60079 (6 parts) Explosive atmosphere equipment and installation Needs revalidation — 60079-0 certification-scheme content corrected August 2026
NEC Art. 500–505 US hazardous location wiring See NEC page

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Items marked Review pending await technical review against the identified edition. Items marked Planned have no reviewed source material behind them. Do not rely on this site for compliance determinations, safety-critical design decisions, or legal interpretation.