Which of the following items should be inspected when responding to a lift station alarm at night?

• A. Amount of screenings and other trash removal.
• B. Motor control center and power panel.
• C. Operation of gas masks.
• D. All of the above.

Answer: (B)

When a lift station alarm sounds, the first thing to check is the equipment that actually powers and controls the pumps. The motor control center and power panel house the electrical supply, motor starters, fuses, breakers, and control relays that run the pumps. Inspecting this area quickly shows whether power is reaching the pumps, whether a breaker has tripped, or if a faulty relay or contactor is causing the alarm. If power and control circuits look good, you can move on to other checks with a clearer sense of what’s failing.

The other options aren’t the immediate cause of an alarm. The amount of screenings and trash removal is a maintenance activity and not how you diagnose an alarm condition. Gas masks pertain to safety gear and confined-space precautions, not the primary cause of an alarm. So the motor control center and power panel is the most relevant inspection to start with.