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Home Standards UL 746C:2001 Polymeric Materials – Use in Electrical Equipment Evaluations

UL 746C:2001 Polymeric Materials – Use in Electrical Equipment Evaluations

UL 746C:2001, issued by Underwriters Laboratories (UL) as the fifth edition on November 29, 2001 (ANSI-approved September 23, 2002), is a safety standard that establishes evaluation requirements and test procedures for polymeric materials used in electrical equipment. It applies to polymeric components in electrical devices, covering their performance in real-world applications while excluding dedicated insulating systems addressed by UL 1446. The standard integrates small-scale property test data (referencing UL 746A for short-term and UL 746B for long-term evaluations) and practical testing methods to assess material suitability.

This standard focuses on verifying key safety and performance attributes critical for electrical equipment use, including thermal stability, electrical insulation, mechanical strength, and flammability resistance (aligned with UL 94 flammability classifications). It defines test protocols for evaluating polymeric parts under thermal aging, high-voltage exposure, and mechanical stress, ensuring materials maintain safe functionality without degradation that could cause fire, electric shock, or equipment failure. It also guides material preselection and end-product part evaluation, serving as a foundational reference for UL certification of polymeric components in electrical applications.

LISUN supplies the fully test solutions for the following UL 746C:2001, please see the below excel table:

UL 746C:2001 Clause and Subject	LISUN Model
3.13 FLAMMABILITY CLASSIFICATION	HVR-LS
17-19 Flammability	HVR-LS
3.14 GLOW WIRE RESISTANCE TO IGNITION	ZRS-3H
3.18 HOT-WIRE RESISTANCE TO IGNITION	RSY-LT
14 Hot-Wire Ignition (HWl) – Abnormal Overload Test or Glow-Wire End-Product Test	RSY-LT
13 High Current Arc Resistance to Ignition (HAl)	HCAI-2
24 Resistance to Impact	LS-B33
57 Resistance to Impact Test	LS-B33
25.4 Ball pressure temperature	ZBP-T
62A Ball Pressure Test on End-Product	ZBP-T
26 Ultraviolet Light Exposu	UV-263LS
58 Ultraviolet Light Exposure Test	UV-263LS
27 Water Exposure and Immersion	JL-X
59 Water Exposure and Immersion Test	JL-X
55 Flame-Retardant Coatings Test	GDJS-015B
67-68 Temperature Considerations
70.2 Sample conditioning
71A.3 Coating Thickness Measurement	EDX-2A
72 Leakage Current Test	B2675D