Park Trailers practice questions

Correct: C — Within 300 mm (12 in.)

552.48(H) sets the 300 mm (12 in.) securing distance for cable connected with clamps or connectors at outlet boxes, panelboards, and splice boxes on appliances. The 200 mm (8 in.) distance is a separate rule under 552.48(I) for nonmetallic boxes without clamps, and 1.4 m (4 1/2 ft) is the general interval for support elsewhere along the run.

Correct: D — An additional wrap or layer of equivalent insulating material at the clamp

552.10(C)(1) requires that where insulated conductors are clamped to the structure, the insulation be supplemented with an additional wrap or layer of equivalent material — because the clamp point is a wear spot. This doesn't apply to jacketed cable, which is specifically exempted, and there's no slack-loop requirement in this section.

Correct: D — The dedicated method in 552.47, in lieu of Article 220

552.47 states its method is used 'in lieu of the procedure shown in Article 220' for park trailer feeder assemblies — Article 220's standard and optional methods don't apply here.

Correct: C — Two dedicated 20-ampere circuits serving only the kitchen countertop and dining receptacles

552.46(B)(2) requires park trailer small-appliance circuits to meet 210.11(C)(1): at least two 20-ampere circuits dedicated to kitchen/dining-area receptacles, with no lighting or other outlets sharing the circuit. Mixing in a ceiling light, dropping to 15 amperes, or routing one circuit to the bathroom all fail that standard.

Correct: C — Five

552.46(A) sets the base allowance at a maximum of five 15- or 20-ampere circuits. Six circuits are only permitted under the specific power-converter exception, not as the general base rule.

Correct: C — 552.48(E)

552.48(E) sets the wooden-plate backing method (38 mm minimum width, 13 mm minimum thickness) as an approved way to mount outlet boxes without direct framing support. 552.48(D) only addresses how flush boxes must sit relative to combustible wall/ceiling surfaces, not backing/mounting hardware.

Correct: C — 150 percent of the appliance rating

552.42(A)(2) permits branch-circuit overcurrent devices up to 150 percent of the rating for a single appliance rated 13.3 A or more supplied by an individual branch circuit. Matching the conductor ampacity exactly (100 percent) is the general default rule, not the exception for this scenario, and 200 percent or 125 percent are not the figure this section specifies.

Correct: D — No separate bonding conductor is required because the bolted connection is considered bonded

Per 552.57(B), a park trailer with a unitized metal chassis-frame construction where the panelboard is securely fastened with bolts and nuts, welding, or riveting is considered to be bonded — no additional bonding conductor is required. The 8 AWG copper minimum requirement in 552.57(C) applies only when a separate bonding conductor is installed.

Correct: D — 50 percent

552.20(B) applies 100 percent to the first 20 amperes, 50 percent to the second 20 amperes (the 20-40 A band), and 25 percent to everything above 40 amperes. 100 percent and 25 percent belong to the other two tiers, and 80 percent isn't part of this method at all.

Correct: C — 552.44(B)

552.44(B) sets the minimum exposed usable cord length (7.0 m side entry, 8.5 m rear entry) and how to measure it, including the added length required when entry height exceeds 900 mm. 552.43(B) only addresses general power-supply cord requirements, not the length measurement rules, and 552.44(C)(2) covers attachment plug ratings, not cord length.

Correct: D — On the exterior skin, at or near the point of entrance of the feeder assembly

552.44(D) requires the label on the exterior skin, at or near the point of entrance of the feeder assembly, so it's visible before the connection is made. The panel cover, hitch area, and interior wall are not the required location.

Correct: A — GFCI protection for personnel and a wet-locations listing

552.48(O)(1)(b) requires the outdoor receptacle to be GFCI-protected for personnel and listed for wet locations — both conditions together, not one or the other. AFCI and damp-location listing are not what this section specifies.

Correct: A — A receptacle located inside an exterior access panel that supplies an installed appliance

552.41(C) carves out one exception: receptacles behind an exterior access panel that supply an installed appliance. Countertop, exterior, and within-6-ft-of-lavatory receptacles are all on the required list with no such carve-out.

Correct: A — Removed and discarded

552.55(C) requires bonding screws, straps, or buses in the panelboard or in appliances to be removed and discarded, since the park trailer panelboard is not service equipment. The neutral-to-ground bond happens upstream at the service, so treating the trailer panel like a service disconnect (where bonding is required) is the wrong-rule confusion here.

Correct: C — Using a grounding screw dedicated to that purpose only, or a listed grounding device

552.56(C)(2) requires a grounding screw used for no other purpose, or a listed grounding device. Using a mounting or cover screw for double duty, or relying on friction contact, does not meet this requirement.

Correct: C — 552.41(B)

552.41(B) is the Location subsection listing the specific placements required, including a receptacle on each side of the sink when countertops of 12 in. or more in width and depth flank it. 552.41(A) only governs spacing between receptacles, not where the sink-adjacent ones must go, and 552.41(F) covers where receptacles are prohibited.

Correct: D — Enclosed and gasketed, listed for the installation, and GFCI-protected

552.54(B) requires all three together: enclosed and gasketed construction, a listing for that installation, and GFCI protection. The outdoor-use listing belongs to exterior equipment under 552.54(C), not to shower or tub luminaires.

Correct: C — Copper

552.10(B)(1) states copper conductors shall be used for low-voltage circuits — no allowance for aluminum or copper-clad aluminum is given in this section.

Correct: C — Rated not in excess of the conductor ampacity

552.10(E)(1) requires the OCPD rating to not exceed the copper conductor's ampacity from Table 552.10(E)(1). The 125% figure is a continuous-load/motor sizing rule that doesn't apply here, and matching the AC service disconnect or relying only on the appliance nameplate ignores the conductor-based sizing this section requires.

Correct: A — 552.59(A)

552.59(A) is the section that requires outdoor fixtures, luminaires, and equipment to be listed for outdoor use. 552.54(A) covers luminaires generally (not specifically the outdoor-listing requirement), and 552.57(D) deals with bonding of the metallic roof/exterior, not fixture listing.

Correct: C — In a listed outlet box or disconnecting means located outside the park trailer

552.59(B) requires the conductors to terminate in a listed outlet box or disconnecting means located outside the park trailer, near the equipment — not inside at a utility closet, spliced bare, or back at the main panel.

Correct: C — 600 mm (24 in.) wide by 750 mm (30 in.) deep

552.45(B) sets the baseline working clearance at 600 mm (24 in.) wide by 750 mm (30 in.) deep. The 750 mm (30 in.) by 900 mm (36 in.) option resembles general dwelling working-space figures but isn't what this section specifies. The 550 mm (22 in.) options only apply under the exposed-cover exception, and even then only one dimension reduces, not both.

Correct: B — A main disconnecting means

552.45(C) requires a main disconnecting means where more than two circuit breakers are employed, regardless of whether fuses are used. Three breakers exceeds that threshold, so a main disconnect is required.

Correct: C — 900 volts

Section 552.60(A) permits either a 1-minute test at 900 volts or a 1-second test at 1080 volts — the 1080-volt figure belongs to the shorter 1-second test, not the 1-minute test, so pairing it with 1 minute is a common mix-up.

Correct: D — An interior branch circuit other than a small-appliance branch circuit

552.41(D)(2) requires connection to an interior branch circuit other than a small-appliance branch circuit. The kitchen small-appliance circuit is specifically excluded, and the rule does not call for tying it to the outdoor receptacle circuit or a separate feeder ahead of the disconnect.

Correct: C — One listed 30-ampere or 50-ampere park trailer power-supply cord, or a permanently installed feeder

552.43(A) permits not more than one listed 30-ampere or 50-ampere power-supply cord, or a permanently installed feeder. Using two cords, adding an adapter, or substituting an extension cord all violate the single-listed-cord requirement and the prohibition on adapters/extension cords in 552.43(B).

Correct: D — A junction box with a blank cover, with the conductor ends capped or taped

552.48(P)(2) requires the load end of the prewired circuit to terminate in a junction box with a blank cover (or other listed enclosure), with the free conductor ends adequately capped or taped. Using the space for a receptacle or another circuit violates the requirement that the circuit serve no other purpose, and leaving conductors loose and uncapped is not permitted.

Correct: D — It must be grounded

552.48(L) requires that any metal faceplate installed on a park trailer receptacle be grounded — an unconditional rule. There's no separate wet-location listing requirement or distinct chassis-bonding path called out here; those are different requirements found elsewhere in the code.

Correct: B — 552.41(A)

552.41(A) sets the 2 ft (600 mm) minimum wall-space width that triggers the requirement and the 6 ft (1.8 m) maximum floor-line distance to an outlet. 552.41(B) only addresses where outlets must be located once required, and 552.41(E)/(F) cover outdoor receptacles and prohibited locations, not general spacing.

Correct: A — 552.52(A)

552.52(A) specifically sets the minimum rating for switches on lighting circuits (10 A, 120/125 V, not less than the connected load). 552.52(B) instead covers switches for motors or other loads, and 552.53 covers receptacles, not switches.

Correct: B — 552.52(C)

552.52(C) is the specific rule prohibiting switches within wet locations in tub or shower spaces unless part of a listed tub/shower assembly. 552.52(A) only addresses switches controlling lighting circuits generally, not location within wet tub/shower spaces, and 552.54(B) governs shower luminaires, not switches.

Correct: A — In accordance with their applicable article, except as otherwise specified in Article 552

552.48(A) permits these cables and raceways in accordance with their own applicable article, except as otherwise specified in Article 552. There is no blanket ampacity derating, no requirement to use only metal raceway, and no blanket double-insulation mandate imposed by this section.

Correct: C — The outside dimensions of the park trailer, excluding the coupler

552.46(B)(1) bases the lighting load on the park trailer's outside dimensions with the coupler excluded. Including the coupler, using interior floor area, or using gross floor area with appliances are not what the section specifies.

Correct: A — 2-pole, 3-wire grounding type, rated 30 amperes, 125 volts

552.44(C)(1) requires a 2-pole, 3-wire grounding-type plug rated 30 amperes, 125 volts for units with two to five 15- or 20-ampere branch circuits. The 50-ampere 125/250-volt option applies only to units with a 50-ampere feeder assembly under 552.44(C)(2), and there's no 20-ampere or 125/250V variant of the 30-ampere plug.

Correct: A — 552.48(F)

552.48(F) directly requires the sheath of NM cable (and the armor of AC/MC cable) to be continuous between outlet boxes and other enclosures. 552.48(H) covers cable supports and 552.48(J) covers physical damage protection — neither addresses sheath continuity.

Correct: C — It must be listed for dual voltage

552.20(D) requires that fixtures or appliances with both 120-volt and low-voltage connections be listed for dual voltage. A standard 120-volt-only listing doesn't cover the combined-voltage hazard, and autotransformers are separately banned outright under 552.20(E), not required.

Correct: C — The low-voltage system's receptacles and plug caps must differ in configuration from the 120/240-volt system's

552.20(F) requires that receptacles and plug caps of the low-voltage system differ in configuration from those of the 120-volt or 120/240-volt system, so they cannot be cross-plugged. Labeling or color-coding alone, per the option limiting the requirement to plug caps only, or the option allowing identical configurations, are all insufficient — the rule requires a physical, non-interchangeable configuration for both receptacles and plug caps.