Summary of Topics s1838_3_sum.htmlSummary of Topics
The revisions of ANSI/UL 1838 dated November 25, 2025 include the following changes in requirements:
– Clarification of derating factors for switches and relays located in a Class 2 circuit; 17.1
– Addition of UL 60730-1 as an alternative to UL 873; 20.3, Appendix A
– Class Y capacitor in an electronic power unit; 22.3.5, Table 22.1
– 2V DC Offset in Power Unit Temperature Test; 33.1, 33.1A, 33.10, 50.11, 50.11A
– Specification for Hot Dip Process in Table 10.1;
– Polymeric requirements for equipment connected to power unit in Table 52.1;
– Unit Low Voltage Cable; 53.4.1
– Potting Compound in Power Supply Units; 2.12A, 2.12B, Section 14A, Section 14B, 24.3.8, Table 33.1, 33.5A, 33.5B
– Withdrawal and replacement of ANSI/ISA MC96.1, Temperature-Measurement Thermocouples; 33.4
– Editorial Revisions; 56.6, 58.1