What is a black diagram used for in building automation?

• A. Used to illustrate signal and power wiring for building automation panels and devices
• B. A schematic of energy consumption over time
• C. A diagram of city power grid connections
• D. A layout of floor plans

Answer: (A)

In building automation, a black diagram is a wiring diagram that shows how signals and power are routed to panels and devices. It maps the electrical connections between controllers, sensors, actuators, and power supplies, detailing terminals, terminals blocks, and where cables run. This makes it the best choice because it directly communicates how to install, connect, and troubleshoot the hardware: you can verify that inputs and outputs are wired correctly, ensure proper power distribution, and keep documentation clear for maintenance.

This differs from diagrams of energy consumption over time, which track usage rather than connections; from city power grid diagrams, which show utility connections and grid topology; and from floor plans, which depict physical layout rather than electrical wiring.