NEC 2023, Article 500 Hazardous locations — translation

NEC 500–505: Class I/II/III, Division 1/2, Zone 0/1/2, equipment requirements.

Document

Document	NEC 2023, Article 500 Hazardous locations
Edition	2023
Status	Current (latest NEC edition)
Issued by	NFPA
Applies to	Hazardous (classified) locations: Class I/II/III, Division 1/2, Zone 0/1/2

Document structure

№	Chapter / section
500	Division classification
501	Class I (gases and vapors)
502	Class II (combustible dust)
503	Class III (fibers)
505	Zone classification

Classification (500)

Class I — gases; Class II — dust; Class III — fibers. Division 1 (normal operation) vs Division 2 (faults only).

Class I (501)

Explosionproof equipment by gas groups A–D and temperature codes; conduit seals; bonding.

Zone classification (505)

IEC-style Zone 0/1/2 allowed for Class I, Ex-marked equipment per IEC/UL.

Data is for reference. Final design decisions must follow current regulations and a qualified engineer.
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