Fire Pumps practice questions

Correct: A — The fire pump controller must still be able to start the pump by other means

695.14(A) requires that loss of power, breakage, disconnection, or shorting of external control conductors not prevent the controller from starting the pump by other internal or external means. Shutting the pump down or locking out automatic features would be exactly the failure mode the rule prohibits.

Correct: D — To carry indefinitely the locked-rotor current of the largest fire pump motor plus the full-load current of all other pump motors and accessory equipment

695.4(B)(2)(a)(1) requires the OCPD to carry indefinitely the sum of the largest fire pump motor's locked-rotor current and the full-load current of all other pump motors and accessory equipment — the device must never open during starting or running. The 125%-of-FLC option describes ordinary motor branch-circuit sizing, not fire pump sizing, and an instantaneous trip above locked-rotor current would shut the pump down exactly when it's needed.

Correct: A — Within the fire pump room

695.3(F) requires transfer of power between the individual source and an alternate source to take place within the pump room. Locating it at the service switchgear, an outdoor disconnect, or the utility vault would put the transfer point outside the protected pump room, defeating the intent of keeping the switching function in the space designed to survive the fire.

Correct: A — If approved by the authority having jurisdiction and installed per 695.3(C)(1) and (C)(3), or (C)(2) and (C)(3)

695.3(C) permits feeder sources in a campus-style complex only with AHJ approval and only when installed per (C)(1) and (C)(3), or (C)(2) and (C)(3). Utility-only sign-off isn't sufficient, and two feeders sharing one utility service don't satisfy 695.3(C)(1)'s separate-services requirement — there's no automatic exemption.

Correct: A — Electrical nonmetallic tubing (ENT)

695.14(E) lists rigid metal conduit, IMC, liquidtight flexible metal conduit, EMT, liquidtight flexible nonmetallic conduit, listed Type MC cable with impervious covering, and Type MI cable. ENT is not on that list, while EMT, MI cable, and liquidtight flexible metal conduit are all explicitly permitted.

Correct: A — Short-circuit protection only

695.6(C) states that fire pump power circuits shall not have automatic overload protection, and conductors are protected against short circuit only (except transformer primary protection under 695.5(C)(2)). Overload-only and combined overload/short-circuit protection would shut the pump down under a sustained overload, and GFPE is separately prohibited under 695.6(G).

Correct: A — It must be capable of carrying the combined locked-rotor and accessory load indefinitely

695.3(A) requires the source to be reliable and capable of carrying the sum of the locked-rotor current of the fire pump and pressure maintenance pump motors, plus full-load current of accessory equipment, indefinitely. Locating the source within the same switchgear section as the service disconnect is actually prohibited by 695.3(A)(1), which requires the connection be located ahead of and separate from the service disconnecting means.

Correct: A — At least 300 mm (12 in.) beyond the fire-rated wall, ahead of the controller

695.6(H)(1) requires the junction box a minimum of 300 mm (12 in.) beyond the fire-rated ceiling, wall, or floor bounding the fire zone, installed ahead of the controller. Placing it immediately adjacent to the wall or measuring from the controller enclosure instead of the fire barrier misreads where the distance is measured from.

Correct: C — Electrical nonmetallic tubing (ENT)

695.6(D)(1) lists RMC, IMC, EMT, liquidtight flexible metal conduit, LFNC-B, jacketed Type MC, and Type MI as the only permitted methods. ENT isn't on that list — it lacks the physical robustness the section requires for this critical wiring run.

Correct: C — The internal wiring of fire pump system components and its acceptance testing

695.1(B)(1) excludes the performance, maintenance, and acceptance testing of the fire pump system and the internal wiring of its components. The dedicated switching, control equipment, and interconnecting circuits to the power source are exactly what 695.1(A) says the article covers.

Correct: C — Physically outside the building, installed as service-entrance conductors

695.6(A)(1) requires service conductors to be physically routed outside the building and installed per 230.6, 230.9, and Article 230 Parts III and IV. The 2-hour fire protection methods and independent routing requirement apply to feeder/generator conductors under 695.6(A)(2), not to service conductors.

Correct: D — This is a violation — only transformers under 695.5(C) may supply loads not directly associated with the fire pump system

Per 695.5, only transformers covered under 695.5(C) are permitted to supply loads not directly associated with the fire pump system. A transformer installed under 695.5(A) and (B) must be dedicated to the fire pump system, so feeding an unrelated lighting panel from it is not permitted regardless of load percentage or added protection.

Correct: A — 15 percent below controller-rated voltage

695.7(A) caps starting voltage drop at 15 percent below controller-rated voltage. The 5 percent figure is the separate running-condition limit from 695.7(D), and 10 percent and 20 percent do not appear in this section.

Correct: D — 430.22

695.6(B)(2) directs motor-only fire pump conductors to 430.22. The combined-load formula in 695.6(B)(1) only applies when a pressure maintenance pump or accessory equipment shares the conductor with the fire pump motor.