How must manual controls appear?

• A. Uniform color to blend in.
• B. Hidden behind glass.
• C. Distinct appearance and clearly recognizable for the purpose intended.
• D. No labeling.

Answer: (C)

Manual controls must be clearly identifiable and easy to locate and operate during an incident. They should have a distinct appearance and be clearly recognizable for the purpose intended, so trained occupants or responders can quickly reach and activate them without hesitation. This rapid recognizability helps ensure the system can be discharged safely and effectively under stress. Visual cues like bright color, legible labeling, and a recognizable shape help distinguish manual controls from other devices and prevent misoperation.

The other options would hinder effective action: blending in with surroundings makes the control hard to find; being hidden behind glass delays access; and lacking labeling creates uncertainty about what the device does.