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

• A. Wet well inlet velocities
• B. Operation of gas masks
• C. Amount of screenings and trash removals
• D. Motor control center and power panel

Answer: (D)

When a lift station alarm sounds, the immediate concern is whether the pumps are being powered and controlled correctly. The motor control center and power panel house the starters, relays, fuses or breakers, and other control circuitry that energize and protect the pumps. Inspecting these components helps you quickly determine if the alarm is due to a loss of power, a tripped breaker, a failed contactor, or another control fault. If the electrical side checks out, you can then move on to other checks, but addressing the power and control system is the crucial first step. The other options focus on hydraulics in the wet well, safety gear for confined spaces, or debris management—areas that are important for overall operation but do not address the likely cause indicated by an alarm in the control system.