UL 773A:6ED 2016-01-19

PREFACE
INTRODUCTION
1 Scope
2 General
CONSTRUCTION
3 Enclosures
4 Accessibility of Uninsulated Live Parts
5 Openings in Enclosure
6 Provision for Mounting
7 Protection Against Corrosion
8 Supply Connections
9 Bonding/Grounding
10 Current-Carrying Parts
11 Internal Wiring
12 Spacings
13 Alternate Spacings - Clearances and Creepage Distances
14 Bonding of Internal Parts for Bonding/Grounding
15 Polymeric Materials
16 Coil Windings
17 Air-Gap Switches
PERFORMANCE
18 General
19 Overload and Endurance Testing - General
20 Overload Test
21 Endurance Test
22 Temperature Test
23 Dielectric Voltage-Withstand Test
24 Operation Test
25 Abnormal Switching Test
26 Limited Short-Circuit Test for Solid-State Switching
   Control
27 Rain Test
28 Exposure to Humid Atmospheres
29 Permanence of Marking Tests
30 Bonding/Grounding Connection Tests
31 Leakage Current Test
32 Leakage Current Following Humidity Conditioning Test
33 Power Supply Abnormal Tests
34 Component Breakdown Test
35 Strain Relief and Lead Securement Tests
36 Knockout Test
37 Mechanical integrity
38 Conduit Connection to Enclosure Tests
39 Snap-On Cover Test
40 Tests on 120V Devices with Varistors
MANUFACTURING AND PRODUCTION TESTS
41 Dielectric Voltage-Withstand Test
RATINGS, MARKINGS AND INSTRUCTIONS
42 Details
43 Instructions
44 Marking requirements for minimum outlet box volume

This revision of ANSI/UL 773A dated June 26, 2020 incorporates the Addition of Requirements for Manufacturer’s Recommended Field Wiring Terminal Tightening torque to Clause 8.1.13 and Table 42.1.

1.1 Requirements contained in this Standard cover controls of the light-sensitive or presence-sensitive types, or both; for indoor or outdoor service; intended for the control of indoor or outdoor loads up to a maximum of 20 A and maximum 347 V; intended for installations on 50 Hz or 60 HZ systems or DC up to 60 V (for US); and DC up to 42.4 V (for Canada); and intended to be installed in accordance with the National Electrical Code (NEC), NFPA 70, the Canadian Electrical Code (CE Code) Part I, CSA C22.2 No. 0, and NOM 001 SEDE.