UL 121201:9ED 2017-09

PREFACE
1 Scope
2 Reference publications
3 Definitions
4 General requirements
5 Requirements for Class I, Division 2 equipment
6 Requirements for Class II, Division 2, Class III,
   Divisions 1 and 2 equipment
7 Nonincendive circuits and nonincendive field wiring
8 Normally nonarcing components
9 Marking
10 Surface temperature requirements
11 Spark ignition testing of nonincendive circuits
12 Evaluation of nonincendive components
13 Evaluation of sealed devices
14 Evaluation of enclosed-break devices
15 Enclosure ingress protection for Class II and III
16 Drop tests and impact tests
17 Evaluation of an oil immersed equipment
18 Manufacturer's instructions
Annex A - Normative References (normative)
Annex B - Common Standards - Safety Requirements for
          Electrical Equipment (informative)
Annex C - Suggested Warnings with French Equivalent
          (informative)

This revision to ANSI/UL 121201 dated April 1, 2021 is being issued to include the following changes in requirements: – Revisions to opening of sealed devices; 3.11, 3.34, 13.1.8 – Revisions to Consideration of Normal operating conditions; 3.30, 4.1.1 – Revisions to the application of general industrial / ordinary locations requirements; 4.2.1, 4.4.1, 4.4.2, 5.6.0, Annex B – Revisions to Li ion batteries used in Division 2 portable equipment; 5.2.2, Annex A – Revisions to the sealed device requirements; 13.1.5 – Revisions to the Drop test for portable equipment; 16.2.1 – Revisions to correct reference in Clauses 5.1.2 and 5.3.1

Includes products which shall comply with the referenced installation codes and standards noted in Annex A.