Concept:
A Building Automation System (BAS) is an integrated control system used to monitor and automate building services such as:
• HVAC systems,
• Lighting,
• Fire safety,
• Security systems,
• Energy management.
The system improves operational efficiency, comfort, and energy conservation.
Step 1: Identify the typical components of BAS.
Major BAS components generally include:
• Controllers,
• Sensors,
• Mechanical actuators,
• User interface systems,
• Communication networks.
Step 2: Analyze each option listed in the question.
• A. VAV -- Variable Air Volume is an HVAC subsystem rather than a fundamental BAS component.
• B. Controller -- Central device used to process and control BAS operations. \checkmark
• C. Raceway -- Electrical cable routing component, not a BAS control component.
• D. Mechanical Actuator -- Used to physically operate dampers, valves, and equipment in BAS. \checkmark
• E. User Interference -- Intended as user interface/interaction system for monitoring and controlling BAS operations. \checkmark
Step 3: Identify the correct combination.
The BAS components are:
\[
B,\; D,\; \text{and}\; E
\]
Therefore, the correct answer is:
\[
{B,\; D\; \text{and}\; E\; \text{only}}
\]