Final answer:
4) UL 864. The UL standard not associated with a standard rating for a visible notification appliance is UL 864; it is the standard for Control Units and Accessories for Fire Alarm Systems and not the notification appliances themselves.
Step-by-step explanation:
The question is asking which of the given UL standards is not a standard rating for a visible notification appliance. Visible notification appliances are part of fire alarm systems and are devices like strobes that provide a visual alert of an emergency situation.
UL 1971 is the standard for Signaling Devices for the Hearing Impaired. This includes requirements for visible notification appliances used for fire alarm signaling to alert those who are deaf or hard of hearing.
UL 464 is the standard for Audible Signal Appliances, which applies to devices intended to attract attention by sound, or a combination of sound and visual means, but not to equipment such as loudspeakers used for voice instructions.
UL 1638 is the standard specifically geared towards visible signaling appliances used for general signaling purposes and also for fire warning. However, it is focused on the visual components, not the audio components.
UL 864 is the standard for Control Units and Accessories for Fire Alarm Systems. This standard covers the system control units that bring everything in the fire alarm system together but is not specifically related to the notification appliances themselves.
Therefore, the standard not associated with a rating for visible notification appliances is UL 864.