UL 746C:7ED 2018-02-05

INTRODUCTION
1 Scope
2 General
3 Glossary
ENCLOSURES
4 General
5 Portable Unattended Household Equipment - Alternate Path
ELECTRICAL INSULATION
6 Material Property Considerations
7 Internal Barriers
PERFORMANCE CRITERIA
8 General
ELECTRICAL
9 Comparative Tracking Index (CTI)
10 Dielectric Strength
11 High Current Arc Resistance to Ignition (HAI)
12 Hot-Wire Ignition (HWI) - Abnormal Overload Test or
    Glow-Wire End-Product Test
13 Inclined Plane Tracking
14 Volume Resistivity
FLAMMABILITY
15 Flammability - 12 mm Flame
16 Flammability - 20 mm (3/4-Inch) Flame
17 Flammability - 127 mm (5 Inch) Flame
18 Enclosure Flammability - 746-5VS
19 Enclosure Flammability - Large Surface Area Considerations
20 Flame-Retardant Coatings
MECHANICAL
21 Crushing Resistance
22 Resistance to Impact
DIMENSIONAL CHANGE OF POLYMERIC PARTS
23 Creep
PERMANENCE
24 Permanence
25 Ultraviolet Light Exposure
26 Water Exposure and Immersion
SPECIAL END-USE CONSIDERATIONS
27 Abnormal Operation
28 Severe Conditions
THERMAL
29 Mold Stress-Relief Distortion
30 Input to Motor
31 Strain-Relief Test after Mold Stress-Relief Distortion
32 Temperature Considerations - General
33 Functional-Use Temperature Indices
34 Generic Thermal Indices
35 Relative Thermal Index
36 Relative Thermal Capability
37 Relative Thermal Capability (Alternate)
38 Temperature Excursions Beyond the Maximum Use Temperature
SPECIALIZED APPLICATIONS
39 General - Adhesives
40 Function Analysis
41 Program of Investigation
42 Coil Forms
43 Conformal Coatings
43A Conformal Coatings
44 General
45 Ductile Coatings
46 Brittle Coatings
TEST PERFORMANCE
47 General
48 End-Product Arc Resistance Test
49 Abnormal Overload Test
50 Flammability - 12 mm Flame Test
51 Flammability - 20 mm (3/4 Inch) Flame Test
52 Flammability - 127 mm (5 inch) Flame Test
53 Enclosure Flammability - 746-5VS Test
54 Flame-Retardant Coatings Test
55 Crushing Resistance Test
56 Resistance to Impact Test
57 Ultraviolet Light Exposure Test
58 Water Exposure and Immersion Test
59 Abnormal Operation Test
60 Severe Conditions Test
61 Mold Stress-Relief Distortion Test
62 Ball Pressure Test on End-Product
63 Input to Motors Test
64 Relative Thermal Capability
65 Relative Thermal Capability (Alternate)
66 Temperature Excursions Beyond the Maximum Use Temperature
67 Temperature Considerations - Illustrative Example
68 Temperature Considerations - Illustrative Example
    (Alternate RTC)
69 Adhesives - Specialized Applications
COIL FORMS
70 Conformal Coating Test
70A Conformal Coating Test
71 Tape Adhesion Test
72 Leakage Current Test
73 Glow-Wire End-Product Test
MARKING
74 General
APPENDIX A - Guidelines for Evaluation of Substitute Polymeric
             Materials
Alternate Enclosure Material Considerations

This revision of ANSI/UL 746C dated September 1, 2021 includes clarification of Diagnostic Test Methods as mentioned in Table 25.1.

These requirements cover parts made of polymeric materials that are used in electrical equipment and describe the various test procedures and their use in the testing of such parts and equipment.