Page review information

Edition covered

NEC / NFPA 79 / UL 508A / IEC 60204-1 / IEC 61508 / IEC 61511 / IEC 60079 — Exact editions are recorded on the linked crosswalk and standards pages.

Content status

Reviewed

Coverage

Navigation summary for available crosswalks; it does not replace the applicability notes and caveats on each linked crosswalk.

Last reviewed

August 2026

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.

Crosswalks

Standards Crosswalks and Overlap Tables

Side-by-side requirement mappings between related standards. Use when designing for multiple markets or resolving conflicts between standards.

Available Crosswalks

Crosswalk	Standards	Use When
NFPA 79 ↔ IEC 60204-1	NFPA 79:2024, IEC 60204-1:2016+AMD1:2021	Machine sold in US + EU markets
UL 508A / NEC / NFPA 79	UL 508A, 3rd Ed. (2018), revised 2025-06-26; NEC 2023; NFPA 79:2024	US panel design with all three standards
Standards Decision Workflow	All major standards	Selecting which standards apply to your project
IEC 61511 ↔ IEC 61508	IEC 61511, IEC 61508	Process SIS application scope vs. functional safety foundation
IEC 60079 ↔ NEC Art. 500/505	IEC 60079, NEC Art. 500/505	Zone vs. Division hazardous-area classification for US projects
Standards Comparison Tool	All 9 standards	Select any two standards to view their overlap matrix

When to Use Crosswalks

NFPA 79 ↔ IEC 60204-1: Use when designing for both US and EU markets. Both standards cover the same technical scope but differ in structure, wiring color conventions, and some specific requirements. Design to the most restrictive from each.

UL 508A / NEC / NFPA 79: Use when building a US industrial control panel. All three interact — understanding which standard “owns” each topic prevents conflicts and gaps.

Decision Workflow: Use at the beginning of a project when you need to determine which standards apply based on machine type, market, and safety requirements.

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Source Files

All crosswalk content is ported from:

• control-standards/rag/standards_intelligence/crosswalks/overlap_matrix/nfpa79_iec60204_overlap.md
• control-standards/rag/standards_intelligence/crosswalks/overlap_matrix/ul508a_nec_nfpa79_overlap.md
• control-standards/rag/standards_intelligence/crosswalks/overlap_matrix/standards_decision_workflow.md

Trust Boundary — Engineering Judgment Required

This site is an independent educational reference for industrial automation standards. It paraphrases and organizes guidance in original language; it is not a substitute for the official published standards, professional engineering judgment, or legal review, and content has not been independently verified against current published editions.

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.