UL RP 121203 2025-04 PDF

Full title and description

St UL RP 121203 2025-04 — Recommended Practice for Portable/Personal Electronic Products Suitable for Use in Class I, Division 2; Class I, Zone 2; Class II, Division 2; Class III, Division 1; Class III, Division 2; Zone 21 and Zone 22 hazardous (classified) locations. This document provides a non‑certification guidance framework for owners/operators, safety and maintenance personnel, and product teams on the safe use, inspection and limited testing of battery‑powered portable electronic devices in specified classified environments.

Abstract

This recommended practice offers practical guidance for the selection, inspection and use of portable/personal electronic products in certain hazardous (classified) locations where certified/listed equipment is not available. It clarifies the intended applications and explicit exclusions (for example: not intended for products powered by premises wiring or for Zone 0/Zone 1/Division 1 applications) and emphasizes that it is not a product certification standard. The document was issued as Edition 2 (originally published 2021) with a redline/revision published April 30, 2025.

General information

• Status: Active (current recommended practice / UL active listing).
• Publication date: Redline revision published April 30, 2025 (Edition 2 originally published January 14, 2021).
• Publisher: Underwriters Laboratories (UL).
• ICS / categories: Hazardous (classified) locations / equipment for explosive atmospheres; ICS listing commonly shown as 21.180 (housings, enclosures and related machine parts) and related electrical safety categories.
• Edition / version: Edition 2 (2021) with Redline/Revision dated April 30, 2025 (often referenced as UL 121203: 2025).
• Number of pages: Approximately 22 pages (typical published PDF length for the 2021/2025 edition).

Scope

The recommended practice provides guidance for the owner/operator of hazardous (classified) locations concerning the use of portable/personal electronic products in: Class I, Division 2; Class I, Zone 2; Class II, Division 2; Class III, Division 1; Class III, Division 2; Zone 21 (Group IIIA only) and Zone 22 (Groups IIIA and IIIB only). It is explicitly not intended for: product certification; devices powered by building wiring or connected communication lines during use; devices powered by sources other than batteries or photovoltaic cells; devices intended for Zone 0/Zone 1/Division 1 or mining applications; or device types already available as NRTL‑certified classified‑location equipment.

Key topics and requirements

• Guidance for selection and safe use of battery‑powered portable/personal electronic devices in the specified Division/Zone classifications.
• Inspection and owner/operator testing recommendations when certified/listed equipment is not available.
• Defined exclusions (premises‑wired devices, non‑battery power sources, mining, Zone 0/Zone 1/Division 1 applications).
• References to related Division and Zone system UL standards (e.g., UL 121201 nonincendive equipment, UL 783 flashlights) and the UL 60079 series for Zone‑system guidance.
• Human factors and operational notes (distraction hazards, RF interference with control/measurement equipment) — considerations beyond ignition risk.

Typical use and users

Intended users include owners/operators of classified/hazardous facilities, safety and EHS managers, maintenance supervisors, site inspectors, and product compliance or field engineering personnel who must evaluate or permit the temporary use of battery‑powered portable electronics where listed/certified products are not available. It is a practical document for site risk‑assessment and procedural controls rather than for product approval testing.

Related standards

Commonly referenced and related standards include: UL 121201 (Nonincendive Electrical Equipment for Use in Class I and II, Division 2 and Class III Divisions 1 and 2), UL 783 (Electric Flashlights and Lanterns for Use in Hazardous Locations), the UL 60079 series (explosive atmospheres / Zone system), and other UL battery and portable equipment standards (for example UL 1642 for lithium batteries) that are relevant to portable device safety. Users should consult those standards for certification and product‑level requirements.

Keywords

UL 121203; Recommended Practice; portable electronic; personal electronic; hazardous locations; classified locations; Class I Division 2; Zone 2; Zone 21; Zone 22; nonincendive; inspection guidance; owner/operator; battery powered.

FAQ

Q: What is this standard?

A: UL RP 121203 is a UL recommended practice that provides guidance (not a product certification standard) for the use and limited owner/operator inspection/testing of battery‑powered portable/personal electronic devices in specified Division and Zone classified (hazardous) locations.

Q: What does it cover?

A: It covers selection, inspection, safe use and operational considerations for portable/personal electronic products in Class I Division 2; Class I Zone 2; Class II Division 2; Class III Divisions 1 and 2; Zone 21 (Group IIIA) and Zone 22 (Groups IIIA and IIIB). It also lists exclusions and situations where the practice is not suitable.

Q: Who typically uses it?

A: Owners/operators of hazardous facilities, EHS/safety managers, maintenance and field operations staff, and compliance engineers who need to permit or assess the temporary or controlled use of portable battery‑powered electronics when certified devices are unavailable.

Q: Is it current or superseded?

A: The document is current/active. Edition 2 (published January 14, 2021) received a redline/revision published April 30, 2025; users should reference the 2025 redline version for the most recent updates.

Q: Is it part of a series?

A: Yes — it is part of UL’s family of hazardous‑location guidance and standards (e.g., UL 121201, UL 783 and elements of the UL 60079 series). It is intended to be used together with applicable certification standards when product listing/certification is required.

Q: What are the key keywords?

A: Portable electronic, personal electronic, hazardous locations, Class I Division 2, Zone 2, Zone 21, Zone 22, nonincendive, owner/operator guidance, UL RP 121203.