CAN CSA C22.2 No. 157-92 (2016) PDF

Full title and description

CAN/CSA‑C22.2 No. 157‑92 (R2016) — "Intrinsically Safe and Non‑Incendive Equipment for Use in Hazardous Locations". This standard sets construction, marking and test requirements for electrical equipment intended to be intrinsically safe or non‑incendive for use in hazardous locations (gas, dust, fibrous atmospheres and gaseous mines) in accordance with the Canadian Electrical Code and related CSA rules.

Abstract

This standard specifies design and constructional requirements, associated apparatus requirements and test procedures for intrinsically safe and non‑incendive electrical equipment intended for use in hazardous locations (Class I, II and III and gaseous mines). It covers tests for non‑incendive equipment, details for intrinsically safe apparatus and associated apparatus, marking requirements and classification references for Groups A–G. The document is the 1992 technical edition as carried forward with subsequent reaffirmations.

General information

• Status: Published (1992 edition); reaffirmed and referenced as R2016 (document historically maintained by CSA Group / CSA America).
• Publication date: Original: June 1992 (CAN/CSA‑C22.2 No. 157‑92); reaffirmation/recorded revision history includes R2012 and R2016 entries.
• Publisher: CSA Group (CSA America / Canadian Standards Association).
• ICS / categories: ICS 29 — Electrical engineering (notably 29.020 Electrical engineering in general; related to equipment for special conditions).
• Edition / version: CAN/CSA‑C22.2 No. 157‑92 (R2016) — commonly referenced as the 1992 edition with later reaffirmation records.
• Number of pages: Approximately 55 pages (1992 edition length as published).

Scope

The standard applies to electrical equipment and parts intended for use in normal atmospheric conditions within hazardous locations defined by the Canadian Electrical Code. It covers: Class I (Groups A, B, C, D), Class II (Groups E, F, G), Class III and gaseous mine environments; tests and construction details for intrinsically safe apparatus; tests for non‑incendive equipment; associated‑apparatus requirements; marking and documentation expectations. It is intended to guide manufacturers, test houses and certifying bodies in assessing equipment safety for hazardous areas.

Key topics and requirements

• Design and constructional requirements for intrinsically safe apparatus (energy‑limiting circuits, component selection, enclosures).
• Tests and test procedures for non‑incendive equipment and intrinsically safe apparatus (spark‑ignition curves, temperature testing, fault conditions).
• Requirements for associated apparatus and entity evaluations when used in safe locations but associated with intrinsically safe circuits.
• Marking, documentation and identification requirements for certified equipment (including Group/Class/Division information and temperature class where applicable).
• Application guidance for Class I, II, III locations and gaseous mines and the applicable grouping of hazardous substances (Groups A–G).

Typical use and users

Manufacturers of portable and fixed electrical devices intended for use in hazardous locations (e.g., instrumentation, sensors, headlamps, portable monitors, transmitters), test laboratories and certification bodies, design engineers for oil & gas, petrochemical, mining and industrial process facilities, and compliance/regulatory personnel. The standard is used during product design, testing and certification to demonstrate suitability for classified locations.

Related standards

Key related and harmonized documents include IEC 60079‑11 (intrinsic safety practices and tests), UL 913 (intrinsically safe apparatus — US test standard), CAN/CSA‑C22.2 No. 213 (non‑incendive equipment for Class I, Division 2), and the general CAN/CSA‑C22.2 No. 0 series (general requirements for electrical products). Note: CSA and stakeholders have migrated many intrinsic‑safety references toward the 60079 series; newer certifications are often issued to CAN/CSA C22.2 No. 60079‑11 editions where adopted.

Keywords

intrinsically safe; non‑incendive; hazardous locations; CAN/CSA‑C22.2 No. 157; Class I; Class II; Class III; Groups A–G; gaseous mines; explosion‑proof; marking; entity concept; associated apparatus.

FAQ

Q: What is this standard?

A: CAN/CSA‑C22.2 No. 157‑92 is the CSA standard that defines construction, testing and marking requirements for intrinsically safe and non‑incendive electrical equipment intended for use in hazardous locations in Canada. It is the 1992 technical edition documented with later reaffirmations.

Q: What does it cover?

A: It covers design and construction requirements, test methods (including spark ignition assessments and temperature tests), marking and requirements for associated apparatus used with intrinsically safe circuits, and the application of equipment across Class I/II/III and gaseous mine locations.

Q: Who typically uses it?

A: Product manufacturers, product designers and electrical engineers working on equipment for oil & gas, petrochemical, mining and other industries with classified areas; test laboratories and certification bodies use it for product evaluation and certification.

Q: Is it current or superseded?

A: The published edition is the 1992 standard (commonly cited as CAN/CSA‑C22.2 No. 157‑92) with recorded reaffirmations (R2012, R2016, etc.). Stakeholders and CSA have announced migration toward the CAN/CSA C22.2 No. 60079‑11 (aligned with IEC 60079‑11) series; planning and effective‑date notices indicate that migration to the 60079‑11 series affects acceptance timelines for new certifications. Users should confirm the currently accepted certification reference with CSA or their certification body for dates and grandfathering rules.

Q: Is it part of a series?

A: Yes — it forms part of the CAN/CSA‑C22.2 family of standards under the Canadian Electrical Code (Part II) addressing equipment safety and hazardous locations, and it aligns functionally with the international IEC 60079 series for explosive atmospheres (especially IEC/CSA 60079‑11 for intrinsic safety).

Q: What are the key keywords?

A: Intrinsic safety, non‑incendive, hazardous locations, Class I/II/III, Groups A–G, associated apparatus, entity concept, marking, spark ignition testing.