UL 2225 2022-04 PDF

Full title and description

ANSI/UL 2225 — Standard for Cables and Cable‑Fittings For Use In Hazardous (Classified) Locations. This standard specifies construction, performance, testing and marking requirements for cables and cable fittings intended for use in hazardous (classified) locations (Class/Division and Zone systems), including requirements for cable sealing fittings and cable types designated for hazardous locations (for example MC‑HL and related types).

Abstract

UL 2225 sets requirements to ensure cables and cable‑fittings installed in Class I, II and III hazardous (classified) locations meet electrical, mechanical and environmental performance criteria necessary to limit ignition sources and maintain safe operation. It is cross‑referenced by the National Electrical Code (NFPA 70) and by industry guidance for hazardous location wiring methods.

General information

• Status: Active / UL standard (in active lifecycle with subsequent revisions published after 2022).
• Publication date: Published/released April 11, 2022 (edition information: Edition 4, originally dated 2013; republished/issued in April 2022).
• Publisher: Underwriters Laboratories (UL).
• ICS / categories: Electrical engineering — Cables and wiring systems; hazardous (classified) location equipment; referenced by installation codes such as NFPA 70 (NEC).
• Edition / version: Edition 4 (2013) as reflected in the April 2022 publication; standard maintained and revised in subsequent years (see related revisions).
• Number of pages: Typical commercial catalog entries list the modern text at approximately 44 pages (published redistributions and later editions may vary).

Scope

UL 2225 covers requirements for cables and cable‑fittings intended for use in hazardous (classified) locations, including construction, insulation and jacket materials, armor and sheathing, voltage and temperature ratings, marking, performance tests (including flame/vertical‑tray and environmental exposure), and requirements for explosionproof and dust‑ignitionproof cable sealing fittings. It applies to cables and fittings used in Division/Zone classifications (Class I, II and III; Zones 20–22 where applicable) and to cable types intended for those locations (for example MC‑HL and other armored/tray/metal‑sheathed types as described in the standard).

Key topics and requirements

• Definitions and designation of cable types for hazardous locations (e.g., MC‑HL, ITC‑HL, other armor/sheathed constructions).
• Construction and material requirements for conductors, insulation, jackets, armor and continuous corrugated metallic sheaths.
• Performance tests: electrical, mechanical, environmental exposure, and flame/vertical‑tray or equivalent fire performance when applicable.
• Cable sealing fittings and cable‑fitting requirements (explosionproof, dust‑ignitionproof, and sealing performance to maintain classification integrity).
• Voltage and temperature ratings, marking and identification for use in specified Class/Division and Zone groups.
• Product marking, labeling and documentation required for field identification and code compliance (including NEC references where applicable).

Typical use and users

Primary users include cable and cable‑fitting manufacturers, product certification and testing laboratories, electrical design and installation engineers, contractors working in industrial and petrochemical facilities, and Authorities Having Jurisdiction (AHJs) who rely on UL listing and marking for approval of wiring methods in hazardous (classified) locations. The standard is used to design, test and list cables and fittings for installations that must comply with NFPA 70 (NEC) and other industry codes.

Related standards

Standards commonly referenced alongside UL 2225 include NFPA 70 (National Electrical Code), UL 1309 (marine/shipboard cable), UL 1685 (vertical‑tray flame test) and other UL standards for cable types and fittings. Installers and manufacturers typically consult these related documents when specifying cable systems for hazardous locations.

Keywords

UL 2225, hazardous locations, classified locations, cables, cable fittings, MC‑HL, cable sealing fittings, explosionproof, dust‑ignitionproof, NFPA 70, Underwriters Laboratories, vertical‑tray flame test.

FAQ

Q: What is this standard?

A: UL 2225 is the Underwriters Laboratories standard that sets requirements for cables and cable‑fittings intended for use in hazardous (classified) locations, covering construction, testing and marking to support listing and safe installation.

Q: What does it cover?

A: It covers cable constructions (conductors, insulation, jackets, armor), cable‑fitting design and sealing requirements, performance tests (including flame and environmental tests), voltage and temperature ratings, and marking for use in specified Class/Division and Zone groups.

Q: Who typically uses it?

A: Cable and fitting manufacturers, testing and certification bodies (NRTLs), electrical engineers and contractors, and AHJs who enforce NEC and other installation codes use UL 2225 to certify and select products for hazardous locations.

Q: Is it current or superseded?

A: The April 2022 issuance is part of the UL 2225 lifecycle; the standard has remained active and has received further revisions in later years (for example a subsequent edition/revision is recorded in 2024). Users should verify they are working to the edition required by the project or AHJ and consult UL or the issuing body for the latest revision date and redline/changes.

Q: Is it part of a series?

A: UL 2225 is part of the family of UL standards addressing cables, cable assemblies and fittings for specific applications (e.g., UL 1309 for shipboard cable, UL 1277, UL 1685 for flame testing). It is commonly cross‑referenced within NEC guidance and by other UL cable standards for complete compliance and installation guidance.

Q: What are the key keywords?

A: Hazardous locations, classified locations, cable fittings, MC‑HL, cable sealing fittings, explosionproof, dust ignitionproof, UL listing, NFPA 70 (NEC).