UL 2683, the Standard for Electric Heating Systems for Floor and Ceiling Installations, covers electric heating systems operating at 600 volts or less. It consolidates requirements previously addressed in multiple standards, including UL 1673, the Standard for Electric Space Heating Cables; UL 1683, the Outline of Investigation for Electric Heating Products for Installation Under Floor Coverings; and UL 1693, the Standard for Electric Radiant Heating Panels and Heating Panel Sets.
Article 424 of the 2023 edition of the National Electrical Code® (NEC), NFPA 70, introduced requirements for radiant wall-heating systems that became effective Jan. 1, 2026. To address these requirements, a Certification Requirement Decision (CRD) was published for UL 2683, adding construction, marking, installation instructions and performance requirements for wall-heating systems.
Developed in collaboration with industry stakeholders, these technical requirements expand the scope of UL 2683 to address radiant wall-heating applications and provide a pathway for certification of products covered by the updated requirements.
In August 2026, UL Solutions received notification that OSHA has included UL 2683 on its list of appropriate standards under the Nationally Recognized Testing Laboratory (NRTL) Program. This makes UL Solutions the first organization to have UL 2683 adopted within the NRTL program scope, further supporting the use of the standard for certification of radiant heating products.
