UL 2231-2:2ED 2012-09

Preface
INTRODUCTION
1 Scope
2 General
3 Components
4 Units of Measurement
5 Normative References
CONSTRUCTION
6 General
7 Grounding
8 Insulation and Protective Features
9 Double or Reinforced Insulation Bridged By
   Components
10 Accessibility of Energized Parts
11 Internal Wiring
12 Spacings
13 Clearances and Creepage Distances
14 Operating Mechanism
15 Isolation Monitor/Interrupter
16 Grounding Circuit
17 Supervisory Circuit
18 Leakage Cancellation
PERFORMANCE
19 General
20 Humidity Conditioning
21 Leakage Current Test
22 Conditioning Tests
23 System Operational Test Requirements
24 Resistance to Environmental Noise Test
25 Normal Temperature Test
26 Dielectric Voltage-Withstand Test
27 Overload Test
28 Endurance Test
29 Low-Resistance Ground Fault Test
30 Supervisory Circuit Test
31 Abnormal Operations Test
32 Extra-Low-Resistance Ground Fault Test
33 Short Circuit Test
34 Terminal Lead Strain-Relief Test
35 Power-Supply Cord Strain-Relief Test
36 Mechanical Tests
37 Cable Flexing Test
38 Accessible Conductive Parts with Double or Reinforced
   Insulation Bridged by Components
39 Switched Equipment Grounding Conductor Tests (US Only)
40 Leakage Cancellation Tests
41 Dust Test
RATINGS
42 General
MARKINGS
43 General
Annex A - Reference Standards (Normative)
Annex B - French and Spanish Translations (Informative)

This revision to ANSI/UL 2231-2 dated December 15, 2020 includes revising requirements for Isolated Circuit Systems – Capacitor Switching Transient Test and Harmonic Distortion Immunity Test; 24.1.3A, 24.2.1 and 24.9.2

This Standard is intended to be used in conjunction with the general requirements of Annex A, Ref. No. 1.