IEC IEEE 60079-30-2-2025 PDF

Full title and description

IEC/IEEE 60079-30-2:2025 — Explosive atmospheres - Part 30-2: Electrical resistance trace heating - Guidance on application for design, installation and maintenance. This joint IEC/IEEE international standard gives guidance and recommendations for selecting, designing, installing, maintaining and repairing electrical resistance trace heating systems where explosive atmospheres may be present (with specific exclusions).

Abstract

This edition (Edition 2.0, 2025) updates and replaces the previous 2015 edition and provides guidance for the application of electrical resistance trace heating systems in hazardous (explosive) atmospheres. It addresses area classification using both Zone and Division methods where applicable, associated control and monitoring equipment, and excludes trace-heating types such as induction, skin-effect or direct-pipe heating and systems intended only for stress-relief. The edition adds material such as Annex I covering other applications of trace heating.

General information

• Status: Published / Active standard.
• Publication date: IEC lists publication date 15 September 2025 (IEC webstore); IEEE listings also show publication entries in late 2025 (IEEE catalog lists 19 December 2025). Users should note both dates when citing organizational subscriptions.
• Publisher: Joint IEC/IEEE international standard (published through IEC webstore and IEEE Standards channels).
• ICS / categories: 29.260.20 (Electrical engineering; equipment for explosive atmospheres).
• Edition / version: Edition 2.0 (2025).
• Number of pages: 73 pages (IEC published base document RLV listing). Note: some distribution catalogs show small variations in page count (e.g., 78 pages) depending on format.

Scope

Provides application guidance for electrical resistance trace heating systems used in areas where explosive atmospheres may be present, excluding those areas requiring EPL Ga or Da (commonly Zone 0 / Zone 20). The standard covers design, selection, installation, control/monitoring, maintenance and repair of trace heating systems, and addresses use of the Division method of area classification where users apply that approach. It explicitly excludes induction heating, skin-effect heating, and direct pipeline heating, and does not cover systems intended solely for stress relief.

Key topics and requirements

• Guidance on design and selection of electrical resistance trace heating systems for hazardous areas.
• Requirements and recommendations for installation and commissioning in Zone/Division classified areas.
• Control, monitoring and protective measures for safe operation in explosive atmospheres.
• Maintenance, inspection and repair practices specific to trace heating in hazardous locations.
• Exclusions: induction heating, skin-effect heating, direct pipeline heating and stress-relief-only applications.
• Guidance on applying the Division method alongside Zone-based area classification.
• New or revised informative annexes (including Annex I on other applications) and editorial/technical updates from the 2015 edition.

Typical use and users

Engineers, designers and specifiers in oil & gas, petrochemical, chemical processing, utilities and other industries where fluids, pipelines, vessels or instrumentation require trace heating within potentially explosive atmospheres. Installers, inspection/maintenance personnel, safety and compliance managers, and standards committees also use this guidance when applying or verifying trace-heating systems in hazardous-area projects.

Related standards

Part of the IEC 60079 series (equipment for explosive atmospheres). Closely related documents include IEC/IEEE 60079-30-1 (general and testing requirements for trace heaters), IEC 60079-10-1 / -10-2 (area classification: gases and dusts), IEC 60079-14 (installation), IEC 60079-17 (inspection and maintenance), IEC 60079-19 (repair) and legacy IEEE Std 515 (trace heating guidance). The 2025 edition cancels and replaces the 2015 edition of 60079-30-2.

Keywords

electrical resistance trace heating, trace heaters, hazardous area, explosive atmosphere, trace heating design, trace heating installation, maintenance, Zone classification, Division method, EPL Ga/Da, IEC 60079 series, IEEE 515.

FAQ

Q: What is this standard?

A: A joint IEC/IEEE international standard (IEC/IEEE 60079-30-2:2025) giving application guidance for electrical resistance trace heating in explosive atmospheres, covering design, installation, control, maintenance and repair practices.

Q: What does it cover?

A: Recommendations for specifying, installing, commissioning, monitoring, inspecting and maintaining electrical resistance trace heating systems in areas with explosive atmospheres; notes exclusions such as induction, skin-effect and direct pipeline heating and systems intended only for stress relief. It also provides information applicable to users employing the Division method of area classification.

Q: Who typically uses it?

A: Design and project engineers, maintenance and inspection teams, safety/compliance officers and procurement/specification writers in oil & gas, petrochemical, utilities and other industries with hazardous-area heating needs. Standards bodies and testing organizations also reference it.

Q: Is it current or superseded?

A: Current — the 2025 Edition (Edition 2.0) is the latest published edition and supersedes the 2015 edition (the 2015 edition was withdrawn once the 2025 edition was published). Users should cite the 2025 edition for current guidance.

Q: Is it part of a series?

A: Yes — it is part of the IEC 60079 series for equipment and practices in explosive atmospheres and specifically pairs with IEC/IEEE 60079-30-1 (product requirements and testing for trace heaters) as well as other 60079 parts covering area classification, installation and maintenance.

Q: What are the key keywords?

A: Electrical resistance trace heating, hazardous area, explosive atmosphere, trace heater design, installation, maintenance, Zone/Division, EPL Ga/Da, IEC 60079-30-1, IEEE 515.