These requirements cover radiant heating panels and heating panel sets@ for use on ac supply system voltages not exceeding 600 V@ designed for installation indoors in nonhazardous locations in household@ commercial@ and industrial applications@ in accordance with Article 424@ Part J@ of the National Electrical Code@ ANSI/NFPA 70. These requirements cover products designed to be permanently connected to a supply circuit@ and that are intended to form an integral part of the building construction after on-site assembly@ installation@ and connection. These requirements do not cover the following: a) Radiant heating panels intended to be installed in a dropped or suspended ceiling which are covered by the Standard for Fixed and Location-Dedicated Electric Room Heaters@ UL 2021; b) Heating panels@ panel sets@ and systems mounted under a floor covering in accordance with Article 424-99 of the National Electrical Code@ ANSI/NFPA 70; c) Heating cables and cable sets@ which are covered by the Standard for Electric Space Heating Cables@ UL 1673; d) Cord connected and movable heating equipment; e) Heating products containing an integral means of producing air flow; f) Heating products containing a regulating thermostat as an integral part of the product construction.