Swimming Pools and Fountains practice questions

Correct: B — A Class A GFCI

680.5(B) requires a Class A GFCI for receptacles and outlets on branch circuits 150 volts or less to ground and 60 amperes or less. The SPGFCI option only applies above 150 volts to ground per 680.5(C), and there is no 40-ampere cutoff in this rule.

Correct: C — Conductive, due to water permeability and porosity

680.26(B)(1) explicitly treats cast-in-place concrete, sprayed concrete, and painted or plastered concrete block as conductive materials because they are water-permeable and porous. Classification doesn't depend on whether the rebar is encapsulated — that only determines which bonding method (tie wire vs. copper grid) applies. Painting the surface doesn't change the classification; only vinyl liners and fiberglass composite shells are considered nonconductive.

Correct: B — 8 AWG solid copper, bare

680.26(B) requires solid copper conductor, insulated, covered, or bare, not smaller than 8 AWG. The 8 AWG bare solid copper option satisfies all three requirements. 10 AWG is undersized, stranded copper doesn't meet the 'solid' requirement, and aluminum is not the specified material.

Correct: A — A solid 8 AWG copper conductor extended from the pool equipotential bonding means to an accessible point near the pump motor

680.26(B)(6)(a) requires a solid 8 AWG copper conductor run from the equipotential bonding means to an accessible point near the pump, sized for a future non-double-insulated replacement motor. A dedicated GFCI breaker and direct bonding to rebar aren't what the rule specifies, and the exemption from bonding doesn't mean no provision at all — the spare conductor is still mandatory.

Correct: A — A listed low-voltage luminaire not requiring grounding

680.54(A) requires grounding for equipment within 5 ft of the fountain, recirculating-system equipment, and non-service panelboards feeding fountain gear — except listed low-voltage luminaires not requiring grounding, which are specifically exempted.

Correct: D — 680.52(B)(2)

680.52(B)(2) covers installation requirements for underwater enclosures, including potting compound and support/fastener material rules when fed by nonmetallic conduit. 680.52(A) only addresses non-underwater enclosures (which defer to 680.24), and 680.51(E) concerns wiring for submersible equipment, not junction box support.

Correct: A — The sign is within the 10 ft scope of 680.57 and must meet its GFCI, location, disconnect, and bonding requirements

Per 680.57(A), the section covers signs installed within a fountain or within 3.0 m (10 ft) of the fountain edge. At 8 ft, the sign falls inside that 10 ft scope, so all of 680.57's requirements (GFCI, location, disconnect, bonding) apply — not just one piece of it.

Correct: B — When it is listed for operation at the low-voltage contact limit or less and supplied by a transformer or power supply complying with 680.23(A)(2)

680.51(A) only excuses GFCI protection for equipment listed for low-voltage contact limit or less supplied by a compliant transformer or power supply per 680.23(A)(2). Operating at 300 volts or less is simply the general voltage cap for submersible equipment under 680.51(B), not a GFCI exemption, and bonding addresses a different hazard.

Correct: C — When the heater is supplied by a branch circuit rated 150 volts or less to ground

680.35(C) requires GFCI protection for portable heaters supplied by branch circuits rated 150 volts or less to ground. There's no GFCI trigger tied to heater voltage rating or cord length in this section, and circulation heaters are explicitly included alongside other portable heaters, not singled out.

Correct: B — Three

680.24(D) requires no fewer than one more grounding terminal than the number of conduit entries. With two conduit entries, the box needs at least three grounding terminals. Matching the terminal count to the conduit entries (two) doesn't provide the required extra terminal.

Correct: A — 12 ft, with no GFCI-based reduction available outdoors

Per 680.22(B)(1), new outdoor installations above the pool or within 5 ft of its inside walls require 12 ft of clearance above max water level. The 7 ft 6 in. GFCI-based reduction in 680.22(B)(2) only applies to indoor installations with totally enclosed luminaires or qualifying paddle fans, and the 5 ft option in 680.22(B)(3) is limited to existing installations.

Correct: A — Class A ground-fault circuit-interrupter protection

Per 680.21(C), outlets supplying pool motors on branch circuits rated 150 volts or less to ground and 60 amperes or less — single- or 3-phase — require Class A GFCI protection. There's no current-rating carve-out below 60 A, and the single-phase vs. 3-phase distinction doesn't change the requirement.

Correct: B — 12 ft from the inside pool wall

680.22(A)(1) requires the receptacle to be not less than 6 ft and not more than 20 ft from the pool's inside wall, and not more than 6 ft 6 in. above grade. 12 ft satisfies both the minimum and maximum. 5 ft is too close, 25 ft exceeds the 20 ft cap, and 8 ft above grade exceeds the height limit even though the horizontal distance is fine.

Correct: A — It is exempt because it is a small conductive surface not likely to become energized and not connected to metallic piping

680.43(D)(4) specifically exempts small conductive surfaces not likely to become energized, such as towel bars and mirror frames, from bonding when they are not connected to metallic piping — even though they sit inside the 5 ft zone. The other choices treat the towel bar like ordinary metal surfaces or raceways, which is the confusion this exception is meant to prevent.

Correct: A — By Chapter 3 wiring methods, since cord-and-plug connection is only permitted for units rated 20 A or less

680.43 permits cord-and-plug connection only for listed spa/hot tub packaged units rated 20 amperes or less; above that, the unit must be connected using Chapter 3 wiring methods. The outdoor flexible cord provisions and an amperage-independent 'any method' reading don't reflect the 20 A cap in this section.

Correct: A — 12 ft

Per 680.43(B)(1)(a), without GFCI protection the mounting height must be not less than 12 ft (3.7 m). The 7 ft 6 in. height only applies when GFCI protection is provided, per 680.43(B)(1)(b).

Correct: D — 8 ft from the inside wall of the hot tub

680.43(A) requires the general-purpose receptacle to be not less than 6 ft and not more than 10 ft from the inside wall, so 8 ft satisfies both bounds. The 4-ft option violates the 6-ft minimum, and GFCI protection alone (or ignoring distance entirely) doesn't satisfy the placement rule.

Correct: D — Rigid polyvinyl chloride (PVC) conduit

680.11(A) permits rigid PVC conduit for underground wiring within 5 ft of a pool. EMT isn't listed in the permitted methods, and both the liquidtight flexible metal conduit and MC cable must specifically be listed for direct burial use to qualify — unlisted versions don't meet the requirement.

Correct: A — There must be no shock hazard under any likely combination of fault conditions

680.23(A)(1) requires the luminaire's design itself to prevent any shock hazard under likely fault conditions during normal use, even absent a GFCI. This is a design-intent standard, not a statement that GFCI-less installations are automatically fine or automatically illegal, and it doesn't call for an internal GFCI device.

Correct: C — An isolated winding type transformer with an ungrounded secondary and a grounded metal barrier between windings

680.23(A)(2) requires either an isolated winding type transformer with an ungrounded secondary and a grounded metal barrier between primary and secondary windings, or an approved system of double insulation between the windings. An autotransformer doesn't isolate primary from secondary at all, and a standard dry-type transformer with a grounded secondary doesn't meet the ungrounded-secondary requirement, so neither qualifies. A buck-boost transformer wired for step-down likewise provides no isolation between windings.

Correct: D — An 8 AWG insulated solid or stranded copper bonding jumper

Per 680.23(B)(2)(b), nonmetallic conduit to a forming shell requires an 8 AWG insulated solid or stranded copper bonding jumper (unless a listed low-voltage system not requiring grounding is used) — not a standard equipment grounding conductor sized from Table 250.66, and not a bare conductor.

Correct: C — 12 AWG, matching the supply conductors

Per 680.23(B)(3), the equipment grounding conductor shall not be smaller than the supply conductors and not smaller than 16 AWG. With 12 AWG supply conductors, the EGC must be at least 12 AWG — the 16 AWG floor only controls when supply conductors are smaller than that.

Correct: D — The fence must be bonded because it is within the 5 ft horizontal zone

680.26(B)(7) requires bonding of fixed metal parts, explicitly including metal fences, located no more than 1.5 m (5 ft) horizontally from the pool's inside walls. At 4 ft, the fence is inside that zone, so it must be bonded unless a permanent barrier prevents contact.

Correct: C — 680.26(B)(5)

680.26(B)(5) covers metal fittings within or attached to the pool structure, such as ladder escutcheons and skimmer faceplates. 680.26(B)(3) governs metallic components of the shell itself (e.g., reinforcing steel), and 680.26(B)(6)/(B)(7) address electrical equipment and fixed metal parts near the pool, not fittings on the structure.

Correct: B — A corrosion-resistant conductive surface with at least 9 in.2 of water contact, bonded per 680.26(B)

680.26(C) requires that where no bonded part touches the pool water, an approved corrosion-resistant conductive surface exposing at least 9 in.2 (5800 mm2) to the water be provided and bonded per 680.26(B). Adding another bonding grid, a nearby GFCI receptacle, or a double-insulated luminaire don't create the required electrical contact with the water itself.

Correct: B — No, because for other than storable pools the cord cannot exceed 900 mm (3 ft)

680.8(A) limits the flexible cord to 900 mm (3 ft) for other than storable pools — the opposite of the claim that the limit only applies to storable pools. A 5 ft cord exceeds that limit, and cord-and-plug connection itself is allowed under 680.8, just with this length restriction.

Correct: C — Aluminum conduit

680.14(A) explicitly bans aluminum conduit and tubing in corrosive environments. Rigid PVC, rigid metal conduit, and RTRC are all named as suitable wiring methods in 680.14 and 680.14(A).

Correct: B — No, radiant heating cable embedded in or below the deck is never permitted

680.27(C)(3) prohibits radiant heating cables embedded in or below a pool deck outright — there is no wet-rating, distance, or GFCI-protection exception that makes it acceptable. The other options describe protections that apply to other equipment types under 680.27(C), not a path to permitting embedded deck cable.

Correct: B — A means for accommodating one equipment grounding conductor

680.23(C)(1) requires a dry-niche luminaire to have means for accommodating one equipment grounding conductor for each conduit entry, unless it's a listed low-voltage luminaire not requiring grounding. The other options are not construction requirements found in this section.

Correct: C — This violates 680.27(B)(1) unless the motor is part of a listed low-voltage system fed by a compliant transformer or power supply

680.27(B)(1) requires motors, controllers, and wiring to be at least 5 ft from the inside pool wall unless separated by a permanent barrier. The only exception that allows closer placement without a barrier is a listed system at or below the low-voltage contact limit, supplied by a listed transformer or power supply complying with 680.23(A)(2). GFCI protection and below-grade enclosure are separate requirements under 680.27(B)(2) and 680.27(B)(1) respectively, and neither substitutes for the clearance rule.

Correct: A — At least one GFCI-protected 125-volt, 15- or 20-ampere receptacle on a general-purpose branch circuit

680.12(B) requires at least one GFCI-protected 125-volt, 15- or 20-ampere general-purpose receptacle specifically 'within an equipment room' — vaults and pits aren't included in that specific mandate. The GFCI-for-all-receptacles rule, by contrast, applies to equipment rooms, vaults, and pits alike. There's no stated minimum count of two, and no 30-ampere minimum rating.

Correct: A — Yes, because the bonding requirement applies with or without associated electrical equipment

680.26(A) states that equipotential bonding to reduce voltage gradients is required for pools with or without associated electrical equipment. The idea that bonding is only triggered by electrical equipment, or that gradients can't occur without an electrical source, misunderstands the purpose — the pool and perimeter surfaces themselves create the gradient risk.

Correct: D — All electrical equipment, including power-supply cords

680.56(A) states that all electrical equipment, including power-supply cords, shall be GFCI protected — there's no carve-out based on amperage, feeder vs. branch circuit, or whether the equipment is submerged. Those distinctions are common confusions with GFCI rules elsewhere in Article 680, but 680.56(A) is written without qualification.

Correct: C — It is separated from the fountain by a solid fence, wall, or other permanent barrier

680.50(B) allows the 5 ft (1.5 m) horizontal setback to be waived only when a solid fence, wall, or other permanent barrier separates the equipment from the fountain. GFCI protection, mounting height, and wet-location listing are separate considerations elsewhere in Article 680 and don't substitute for the physical barrier this section requires.

Correct: B — A low-water cutoff or other approved means of overheat protection

680.51(D) specifically requires a low-water cutoff or other approved means to prevent overheating when equipment that depends on submersion loses that submersion. GFCI protection, bonding jumpers, and disconnect location are all real 680 requirements elsewhere in the article, but none address the overheating hazard from loss of water contact.

Correct: A — 12 AWG, regardless of the Table 250.122 result

680.7(A) sets 12 AWG insulated copper as the floor for feeder and branch-circuit EGCs in pool corrosive/wet locations, even when Table 250.122 alone would permit a smaller conductor. 10 AWG is not the stated minimum, and bare conductors don't meet the insulated-copper requirement.

Correct: B — Only within the area of the hydromassage tub, connecting the required metal parts together

Per 680.74(B), the bonding jumper is for equipotential bonding in the area of the hydromassage bathtub and is not required to be extended or attached to any remote panelboard, service equipment, or electrode. The grounding electrode, service equipment, and panelboard options all describe extending the bond to a remote point, which the section explicitly says is not required.

Correct: A — 3 m (10 ft) diagonally from the nearest point on the fan to the nearest point on the pool's top rim

680.35(E) requires 3 m (10 ft) measured diagonally between the nearest point on the fan and the nearest point on the pool's top rim, since the fan operates above the low-voltage contact limit. A flat horizontal or vertical-only measurement, or the 1.5 m (5 ft) figure (which applies to switches under 680.35(F)), would misapply the rule.

Correct: B — The equipotential bonding requirements of 680.26(B) do not apply

680.45 waives 680.26(B) equipotential bonding specifically when the immersion pool has no permanently installed or connected electrical equipment and is located entirely on or above the finished floor. Being permanently installed as a pool type doesn't override this exception, and the rule isn't conditioned on indoor/outdoor location or spa listing.

Correct: C — Class A GFCI protection

680.45(C)(2) specifically requires Class A GFCI protection for storable/portable heaters supplied at 150 volts or less to ground. GFPE is not the applicable protection type here, cord length doesn't exempt the GFCI requirement, and the requirement applies regardless of the voltage/ampere tier described.

Correct: B — 680.32 and 680.34

680.35(G) requires a receptacle rated 250V, 50A or less within 6.0 m (20 ft) of an immersion pool, and used to power pool equipment, to meet both 680.32 and 680.34 together — GFCI protection and location requirements, not just one of them.

Correct: A — Underwater pool lighting

680.13 requires a maintenance disconnecting means for all pool utilization equipment except lighting. Pumps, heaters, and blowers are utilization equipment covered by the rule; lighting is specifically excluded, per 680.13.

Correct: B — The mounting bracket

680.23(D) states that where connection to a forming shell is specified, the connection shall be to the mounting bracket instead, since a no-niche luminaire has no forming shell. The wet-niche housing, direct bonding-grid connection, and dry-niche enclosure aren't the substitution point this rule identifies.

Correct: A — 680.9(A)

680.9(A) sends open overhead power conductors to Table 680.9(A) for minimum clearances. 680.9(B) only covers communications/coax cables, and 680.9(C) applies specifically to network-powered broadband conductors, not general power conductors.

Correct: D — The 4 in.-above-deck elevation, since it is the greater of the two

680.24(B)(2)(a) requires the enclosure to be located at whichever elevation is greater between 4 in. above deck/ground level and 8 in. above max pool water level — not a fixed preference for water clearance, discretion, or an average.

Correct: A — 4.5 ft from the pool wall and 5 in. above the pool deck

680.24(A)(2)(a) and (b) require at least 4 in. above deck/grade or 8 in. above max water level (whichever is greater), plus at least 4 ft horizontal clearance from the pool wall unless a permanent barrier separates the box. The 4.5 ft / 5 in. option clears both the vertical and horizontal minimums. The 3 ft option fails the 4 ft horizontal rule, the 6 in. above water option falls short of the 8 in. minimum, and the flush deck box option is only permitted at or below the low-voltage contact limit, not above it.

Correct: D — The lift's battery is removed for charging at another location and is rated at or below the low-voltage contact limit

Per 680.81, listing/labeling isn't required when the battery is removed for offsite charging and is rated at or below the low-voltage contact limit. Who installs it, how often it's used, and bonding to the equipotential grid don't affect the listing requirement.

Correct: B — GFCI or SPGFCI protection, since the height clearance is not met

Under 680.22(B)(4), fixtures in the 5-10 ft zone need GFCI or SPGFCI protection unless they are at least 5 ft above the max water level and rigidly attached. At only 4 ft above water, the height exception isn't met, so protection is required. Relocating beyond 10 ft isn't necessary — protection within the zone is sufficient, and bonding alone does not substitute for GFCI/SPGFCI protection.

Correct: C — 680.22(B)(6)

680.22(B)(6) is the specific exception permitting listed low-voltage luminaires meeting the stated conditions to be located less than 5 ft from the inside pool wall. 680.22(B)(1) sets the general outdoor clearance requirement this exception relaxes, and 680.22(B)(5) addresses cord-and-plug-connected luminaires within 16 ft of the water surface, not the 5 ft wall clearance.

Correct: A — GFCI protection complying with 680.5(B), or SPGFCI protection complying with 680.5(C)

680.22(A)(4) requires GFCI or SPGFCI protection for any 125–250 volt, 60 A or less receptacle within 6.0 m (20 ft) of a pool's inside walls — 18 ft falls inside that zone. The 6 ft distance is a separate placement minimum, not the protection trigger, and the rule explicitly allows either GFCI per 680.5(B) or SPGFCI per 680.5(C) — it doesn't limit protection to SPGFCI only or to receptacles feeding pool equipment.

Correct: D — Subdivided into loads not exceeding 48 amperes each

680.10(A) requires resistive heating elements to be subdivided into loads not exceeding 48 amperes, protected at not over 60 amperes. The 60-ampere figure is the overcurrent protection cap, not the load-subdivision limit, and 'listed and sized to nameplate' describes heat pumps/chillers under 680.10(B), not resistive heaters.

Correct: B — The spa's top rim must be at least 710 mm (28 in.) above perimeter surfaces within 760 mm (30 in.)

680.42(B) requires the top rim be at least 710 mm (28 in.) above all perimeter surfaces within 760 mm (30 in.) horizontally. The buried bonding grid describes 680.26(B)(2), which this exception avoids. The spa must NOT be indoor-only rated, and it must be located on or above grade, not below grade.

Correct: C — Any receptacle rated 125 through 250 volts, 60 amperes or less

680.32 requires GFCI/SPGFCI protection for any 125-through-250-volt receptacle rated 60 amperes or less within 20 ft of a storable pool's walls — not just 15/20 A general-purpose outlets, not just a pump-dedicated receptacle, and not receptacles above 60 A, which fall outside this rule's scope.

Correct: D — A transformer or power supply meeting 680.23(A)(2) with a primary rating not over 150 V

Per 680.33(A), a within-low-voltage-contact-limit assembly requires a transformer or power supply per 680.23(A)(2) rated not over 150 V primary, along with no exposed metal parts and an impact-resistant polymeric lens, body, and transformer enclosure. The integral GFCI with open-neutral protection and permanently connected lamp are features of the 680.33(B) assembly (over the low-voltage contact limit), not this one, and exposed metal parts are prohibited under both options.

Correct: B — A towel bar not connected to metal framing

680.62(B) exempts small conductive surfaces unlikely to become energized, such as towel bars and mirror frames not connected to metal framing. Pump motor parts, nearby unbarriered metal piping, and unrelated electrical devices/controls within 5 ft are all specifically required to be bonded.

Correct: D — GFCI protection

680.62(A) requires GFCI protection for the outlet supplying a self-contained, packaged, or field-assembled therapeutic tub, with no distinction based on assembly type. The voltage/phase condition in the last option describes when the requirement can be waived under 680.62(A)(2), not a precondition for it to apply. AFCI is not the protection type specified here.

Correct: A — An 8 AWG insulated solid or stranded copper bonding jumper

Per 680.27(A)(2), when LFNC, rigid PVC, or RTRC is used, an 8 AWG insulated solid or stranded copper bonding jumper must be installed in the conduit and terminated at the forming shell and junction box. A 12 AWG equipment grounding conductor and a ground rod don't meet this specific bonding jumper requirement, and nonmetallic conduit is never self-bonding.

Correct: D — No, because 680.23(F)(2) sets 12 AWG as the minimum regardless of what 250.122 would allow

680.23(F)(2) sizes the EGC per 250.122 but sets a hard floor of 12 AWG — a smaller conductor is not allowed even if the standard table would permit it. The EGC must also be copper, not aluminum, ruling out that distractor.

Correct: C — The other conductors are also GFCI protected

680.23(F)(3)(1) permits sharing only when the other conductors are themselves GFCI protected. A higher voltage rating, a bonded metallic raceway, or the other circuit also serving pool equipment are not among the listed exceptions in 680.23(F)(3).