UL 1638A:2021 PDF Download

1.1 These requirements cover electrically-operated visual signaling appliances, rated 300 volts or less, and intended for indoor locations, outdoor locations, or both, in accordance with the National Electrical Code, NFPA 70.

1.2 These requirements cover visual signaling appliances for use in ordinary locations. Visual signaling appliances for use in hazardous locations, as defined in the National Electrical Code, NFPA 70, are evaluated on the basis of their compliance with these requirements and further appropriate examination and tests to determine their acceptability for such use.

1.3 These requirements cover general signal use visual signaling appliances that are intended for non-emergency use. These visual signals do not contain any sensory functions and are intended to be connected to or controlled by other equipment.

1.4 When the appliance produces both a visual signal and an audible signal, the product shall also comply with the Standard for Audible Signal Appliances for General Signaling Use, UL 464A, or the Standard for Speakers for Commercial and Professional Use, UL 1480A, as appropriate.

1.5 These requirements do not cover visual signaling appliances intended for fire alarm use as defined in the National Fire Alarm Code, NFPA 72.

1.6 These requirements do not cover lamp or strobe-light assemblies intended for entertainment or room lighting.

1.7 These requirements do not cover emergency lighting or exit lighting visual signals.

1.8 These requirements do not cover annunciators that identify functions of a fire or emergency signaling system or relate information concerning portions thereof. Annunciators are covered under the Standard for Control Units and Accessories for Fire Alarm Systems, UL 864.