UL 746C PDF

1 Scope

1.1 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.

1.2 These requirements do not cover the specific insulating systems that are covered by the requirements contained in the Standard for Systems of Insulating Materials – General, UL 1446.

1.3 Test procedures are provided herein for the evaluation of polymeric materials in specific applications. These test procedures include references to data obtained from small-scale property tests conducted under standard conditions as well as other practical means of evaluation.

1.4 Unless otherwise indicated, parts made by Additive-Manufacturing (AM) Technology shall be evaluated by subjecting the end-product part or test specimens cut from the end-product part to the specified test. For preselection purposes, test specimens printed in the specified dimensions or cut to the specified dimensions from a printed part may represent the end product when the same production conditions are used.

SUMMARY OF TOPICS

This revision of ANSI/UL 746C dated March 7, 2025 includes the following changes in requirements:

– Addition of Requirements for Testing Un-Notched Izod Impact Specimens to 57.2.1 as Exception No. 3

– Addition of Requirements for Improvements to Water Immersion Testing in Section 58: 58.1

– Addition of Fahrenheit Temperature Values to Table 69.1

– Editorial correction to Table 69.1.