1 Scope

Summary of Topics

This revision of ANSI/UL 924 dated May 5, 2020 includes the following changes:

• Open Type Devices; 4.40.1, 8.2.1, 52.3, 66.2.1, 73.1.46, 76.1• Electronic circuit fault assessment and functionality, 23.3, 28.1, 28.2, 30.1, 47.3• Modification to a derangement signal activation condition; 28.2• ELCDs with control functionality to independently monitor normal power status; Section 29A• ELCDs to be evaluated only for power status conditions; 29A.2• Self-Testing/Self-Diagnostic Equipment Load Loss Detection Thresholds; 30.1, 74.4• Derangement signal calibration for self-test equipment with variable output levels; 30.1.1, 74.5• Flashing Exit Signs; 40.5, 40.6, Figure 40.1, Section 43.5• Test methods for constant-current rated equipment; 45.2, 45.2.1, 45.2.2, 49.1, 52.10• Clarifying markings and instructions for emergency air handling luminaires; 73.1.30, 76.2• Adding the word “emergency” to citations for directly controlled luminaires; 4.13.1, 73.1.44, 73.1.45, Appendix B1• Correction to LVLE (low voltage limited energy) definition and test program; 4.37, 50.1, 50.2• Revise definition of “Service”; 4.53• Polymeric enclosure resistance to impact testing; 10.2.1• Supply wiring connections for PoE (Power over Ethernet) equipment; 17.1.1• Additional battery compliance options; 22.2.1, 22.2.1.1, 22.2.1.2• Test switch accessibility; 29.3• Impedance Networks; 22.2.2, 33.1• Guidance for non-Arabic character text-based exit signs; 40.8• Clarification of dielectric voltage withstand test potentials; 56.1• Simplifying the requirement for instructions to be provided with equipment; 73.1.11, 74.1, 74.6• Temperature test measurement clarification and de-linking the ELCF test; 52.1, Table 52.1• Editorial adjustments and corrections; 18.1.3, 31.3, Table 37.2, 48.7, 49.2, 49.3, 55.1, 76.1, 76.5, SA4.2