During NFPA 20 startup, which statement best describes interlock verification before starting?

• A. That the discharge pressure is at the rated discharge pressure.
• B. That the fire alarm panel is the only active device.
• C. That required conditions are met before starting, including priming and valve positions.
• D. That the pump should not be started until the interlock system confirms readiness.

Answer: (D)

Interlock verification is about ensuring the fire pump only starts when everything needed for a safe start is confirmed by the interlock system. Before NFPA 20 startup, the interlock checks that conditions such as priming being complete, required valve positions being correct, suction and discharge readiness, and electrical readiness are satisfied. Only after these conditions are verified does the interlock permit the start. This gatekeeping function is why describing the pump as not starting until the interlock confirms readiness is the best representation. The other statements describe conditions that may be true or desirable but don’t capture the protective role of the interlock in preventing a start until readiness is actually verified.