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MASTER NEC 2023

Master Electrician Practice Test 18 – Special Equipment: Signs, Elevators, Cranes & IT Equipment

This is Master Electrician Practice Test 18 — Special Equipment, covering the smaller but frequently tested equipment articles: electric signs (Article 600), cranes and hoists (Article 610), elevators (Article 620), audio equipment (Article 640), and information technology equipment rooms (Article 645). The test has 25 multiple-choice questions on sign circuits and disconnects, crane runway conductors, elevator disconnects and hoistway wiring, and the special allowances available in IT equipment rooms. Pass score is 70%. Every question includes a full NEC 2023 explanation so you can trace each answer back to the exact code section.

TOPICS COVERED

Special Equipment

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Frequently Asked Questions

Yes — completely free with no signup required. All answers include detailed explanations.

Requirements vary by state but typically include 4–8 years of documented electrical work experience plus a valid Journeyman license.

Advanced NEC code interpretation, load calculations, service entrance design, motor controls, generator systems, and electrical system design.

The Master exam focuses more on design, calculations, and planning rather than installation details. Load calculation and service sizing questions are weighted heavily.

Before You Start

25 questions — multiple choice
45 minutes to finish (timer starts when you begin)
Pass score is 70% — you need at least 18 correct answers
Full NEC 2023 explanation shown for every question after you submit

Topics in This Test

Dedicated 20A sign outlet at each pedestrian-accessible entrance (NEC 600.5(A))
Sign disconnecting means — within sight or lockable (NEC 600.6(A))
Sign grounding and bonding of metal parts (NEC 600.7)
Neon secondary (GTO) conductor special wiring rules (NEC 600.32)
Crane/hoist disconnecting means — accessible, lockable (NEC 610.31)
Bare crane runway contact conductors — guarding requirement (NEC Article 610, Part IV)
Crane motor overcurrent protection principles (NEC 610.42)
Elevator disconnecting means — single means for all ungrounded conductors (NEC 620.51(A))
Elevator disconnect lockable in the open position (NEC 620.51(A))
Elevator car lighting/receptacle/ventilation circuit kept separate from power (NEC 620.22)
Machine room lighting circuit and switch at point of entry (NEC 620.23/620.24)
Elevator hoistway wiring methods (NEC 620.21)
Elevator traveling cable — special listed cable type
GFCI protection in elevator pit, car top, and machine room (NEC 620.6)
Special IT equipment room provisions apply only when all listed conditions are met (NEC 645.4)
IT equipment room disconnecting means (NEC 645.10)
Under-raised-floor cabling allowance unique to IT rooms (NEC 645.5(E))
Flexible cords for certain permanently installed audio equipment (NEC 640.9)
Maximum sign branch-circuit ratings — 20 A, or 30 A for neon tubing (NEC 600.5(B))
Conditions required to use the Article 645 wiring allowances (NEC 645.4)
Elevator car light, receptacle, and ventilation disconnect (NEC 620.53)
IT equipment branch-circuit conductors — 125% of connected load (NEC 645.5(A))
Extraneous wiring restrictions in an elevator hoistway (NEC 620.37)

Tip: These are "niche" articles individually, but together they make up a meaningful chunk of the master exam. Learn each article's scope first — once you know which article a piece of equipment falls under, most of the specific rules follow logically from the equipment's obvious safety concerns (moving parts, exposed conductors, continuous operation).

Questions

45 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Master Electrician Practice Test 18 – Special Equipment: Signs, Elevators, Cranes & IT Equipment — Question List

Question 1: NEC 600.5(A) requires each commercial building and occupancy accessible to pedestrians to have at least one sign outlet supplied by:

A dedicated 20A branch circuit
Any shared general-purpose lighting circuit
A Class 2 power-limited circuit only
No circuit is required if the sign is battery-powered

NEC Reference: NEC 600.5(A)

Question 2: NEC 600.6(A) requires the disconnecting means for an electric sign to be:

Within sight of the sign, or lockable in the open position if not
Located only inside the building, regardless of sign location
Optional for signs under 20A
Never required for outline lighting

NEC Reference: NEC 600.6(A)

Question 3: NEC 600.7 requires the metal parts of an electric sign to be:

Grounded and bonded
Left ungrounded to avoid stray current
Insulated from all metal, not grounded
Bonded only if the sign is illuminated

NEC Reference: NEC 600.7

Question 4: Neon and other electric-discharge lighting secondary (GTO) conductors are subject to:

Special high-voltage secondary wiring rules distinct from standard branch-circuit wiring
No special rules — treated identically to ordinary NM cable
A total prohibition under the NEC
Rules identical to service-entrance conductors

NEC Reference: NEC 600.32

Question 5: NEC 610.31 requires the disconnecting means for a crane or monorail hoist to be:

Readily accessible and operable from the ground or floor level, lockable
Located only in the crane cab, inaccessible from the floor
Optional for cranes under 5 tons
Not required if the crane is manually operated

NEC Reference: NEC 610.31

Question 6: Bare runway contact conductors that supply a traveling crane, per NEC Article 610, Part IV (Contact Conductors), must be:

Guarded or positioned to prevent accidental contact
Left fully exposed at floor level with no guarding
Insulated with standard THHN, eliminating any guarding need
Prohibited entirely under the current NEC

NEC Reference: NEC Article 610, Part IV

Question 7: Overcurrent protection for crane and hoist motors under NEC 610.42 is generally based on principles similar to:

Article 430 motor overcurrent protection principles
Article 680 pool bonding principles
Article 800 communications principles
No overcurrent protection is required for crane motors

NEC Reference: NEC 610.42

Question 8: NEC 620.51(A) requires an elevator to have:

A single disconnecting means for all ungrounded conductors
A separate disconnect for every individual motor in the system
No disconnecting means at all
A disconnect located only inside the elevator car

NEC Reference: NEC 620.51(A)

Question 9: NEC 620.51(A) requires the elevator disconnecting means to be:

Capable of being locked in the open position
Automatically reset after 30 seconds
Rated at exactly 15A regardless of load
Prohibited from being locked, for fire code reasons

NEC Reference: NEC 620.51(A)

Question 10: NEC 620.22 requires an elevator car's lighting, receptacle, and ventilation/air-conditioning circuit to be:

Kept separate from the elevator's power circuits
Combined with the main drive motor circuit to save wiring
Eliminated entirely — elevator cars require no lighting circuit
Supplied only by battery power, never by branch circuit

NEC Reference: NEC 620.22

Question 11: NEC 620.23/620.24 require the elevator machine room lighting circuit to have:

A switch located at the point of entry to the space
No switch — the lighting is always on
A switch located only inside the elevator car
A motion sensor is mandatory, with no manual switch permitted

NEC Reference: NEC 620.23/620.24

Question 12: NEC 620.21 requires wiring installed in an elevator hoistway to use which type of wiring methods?

Recognized raceways or cables such as RMC, IMC, EMT, or listed MC/MI cable
Open, unsupported conductors with no raceway
Only bare copper busbar
Only Class 2 low-voltage cable

NEC Reference: NEC 620.21

Question 13: The flexible cable that connects a moving elevator car to a fixed termination point in the hoistway is known as:

A traveling cable
A service lateral
A tap conductor
A drip loop

NEC Reference: NEC Article 620

Question 14: NEC 620.6 requires GFCI protection for 125V, single-phase, 15A and 20A receptacles located in which elevator-related spaces?

The elevator pit, car top, and machine room
Only the lobby waiting area
Only the building's main electrical room
GFCI is never required anywhere in an elevator installation

NEC Reference: NEC 620.6

Question 15: NEC 645.4 permits the special wiring allowances of Article 645 (Information Technology Equipment) to be used only when:

All of the article's listed conditions are met together
The room is larger than 500 sq ft
The building has more than five stories
Any one condition alone is sufficient

NEC Reference: NEC 645.4

Question 16: NEC 645.10 requires an information technology equipment room to have:

A disconnecting means for power to all IT equipment in the room
No disconnecting means, ever, to avoid accidental data loss
A disconnect rated for exactly 15A regardless of room size
A requirement that the room never have a fire alarm connection

NEC Reference: NEC 645.10

Question 17: When all the conditions of NEC 645.4 are met, what does NEC 645.5(E) permit for power cables under a raised floor in an information technology equipment room?

All power wiring under the floor must be in rigid metal conduit
Listed power cables may be installed under the raised floor without a raceway
Power cables are prohibited under the floor; only data cables are allowed
Power cables are allowed only if they are Class 2

NEC Reference: NEC 645.5(E)

Question 18: NEC 640.9 permits flexible cords to be used for certain permanently installed audio equipment. How does this compare to the general rule in Article 400?

It is an exception to the general 400.12 prohibition, under specific conditions
It duplicates 400.12 exactly with no exception
It bans flexible cords for audio equipment entirely
It applies only to portable, non-permanent audio equipment

NEC Reference: NEC 640.9

Question 19: Under NEC 600.5(B), what is the maximum branch-circuit rating for signs containing incandescent and fluorescent illumination, and for circuits supplying neon tubing installations?

15 A for incandescent/fluorescent; 20 A for neon tubing
20 A for incandescent/fluorescent; 30 A for neon tubing
30 A for incandescent/fluorescent; 40 A for neon tubing
20 A for both

NEC Reference: NEC 600.5(B)

Question 20: Which of the following is one of the conditions NEC 645.4 requires before the special wiring allowances of Article 645 can be used in an IT equipment room?

The room is at least 1,000 sq ft in area
The room is located on the building's ground floor
The room is separated from other occupancies by fire-resistance-rated walls, floors, and ceilings with protected openings
All IT equipment is supplied through a UPS

NEC Reference: NEC 645.4

Question 21: Per NEC 620.53, the disconnecting means for an elevator car's lighting, receptacle(s), and ventilation power-supply conductors must be:

The same switch as the main drive-motor disconnect
Located on top of the elevator car only
Omitted, since these circuits are fed from a lighting panelboard
A single means for that car, separate from the drive-motor disconnect, located in the machine room or control room for that car

NEC Reference: NEC 620.53

Question 22: The branch circuit supplying IT equipment in a room that meets NEC 645.4 has a total connected load of 16 A. Under NEC 645.5(A), what minimum ampacity must the branch-circuit conductors have?

16 A
18.4 A
20 A
24 A

NEC Reference: NEC 645.5(A)

Question 23: How does the NEC's approach to bare crane runway contact conductors (Article 610) differ from its approach to overhead service conductors (Article 230)?

Crane conductors rely on guarding/positioning; service conductors rely primarily on clearance distances
Both use the exact same clearance-only approach with no guarding
Crane conductors require no protection of any kind
Service conductors are always guarded, never using clearance

NEC Reference: NEC Article 610, Part IV / 230.24

Question 24: NEC 620.37 generally restricts what may be installed within an elevator hoistway?

Wiring and equipment not associated with the elevator itself
Nothing — any building wiring may pass through freely
Only the traveling cable, which is also prohibited
Fire alarm wiring only, which is otherwise unrestricted

NEC Reference: NEC 620.37

Question 25: A rooftop channel-letter sign is supplied from a panelboard on the floor below, and the branch-circuit breaker is not within sight of the sign. Which arrangement complies with NEC 600.6(A)?

A tag on the breaker marked 'SIGN' is sufficient
A snap switch inside the sign body may serve as the only disconnect
The breaker is lockable in the open position, with a locking provision that stays in place with or without the lock installed
No disconnect is needed because the sign is on a roof

NEC Reference: NEC 600.6(A), 110.25

Key NEC References for This Test

Article	What It Covers
Art. 220	Load Calculations — optional and standard methods for multifamily
Art. 230	Services — service design, sizing, multiple disconnects
Art. 430	Motors — complete branch circuit design (conductor + OCPD + overload + disconnect)
Art. 445	Generators — standby systems, transfer switches
Art. 450	Transformers — sizing, primary/secondary OCPD, installation
Art. 706	Energy Storage Systems — battery/solar storage (major NEC 2026 expansion)

Study Tip: Practice transformer kVA calculations daily. Know the formula: I = kVA × 1000 ÷ (V × 1.732) for three-phase. This comes up on almost every master exam.

Master Electrician Practice Test 18 – Special Equipment: Signs, Elevators, Cranes & IT Equipment

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Key NEC References for This Test

Master Electrician Practice Test 18 – Special Equipment: Signs, Elevators, Cranes & IT Equipment

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Master Electrician Practice Test 18 – Special Equipment: Signs, Elevators, Cranes & IT Equipment — Question List

Question 1: NEC 600.5(A) requires each commercial building and occupancy accessible to pedestrians to have at least one sign outlet supplied by:

Question 2: NEC 600.6(A) requires the disconnecting means for an electric sign to be:

Question 3: NEC 600.7 requires the metal parts of an electric sign to be:

Question 4: Neon and other electric-discharge lighting secondary (GTO) conductors are subject to:

Question 5: NEC 610.31 requires the disconnecting means for a crane or monorail hoist to be:

Question 6: Bare runway contact conductors that supply a traveling crane, per NEC Article 610, Part IV (Contact Conductors), must be:

Question 7: Overcurrent protection for crane and hoist motors under NEC 610.42 is generally based on principles similar to:

Question 8: NEC 620.51(A) requires an elevator to have:

Question 9: NEC 620.51(A) requires the elevator disconnecting means to be:

Question 10: NEC 620.22 requires an elevator car's lighting, receptacle, and ventilation/air-conditioning circuit to be:

Question 11: NEC 620.23/620.24 require the elevator machine room lighting circuit to have:

Question 12: NEC 620.21 requires wiring installed in an elevator hoistway to use which type of wiring methods?

Question 13: The flexible cable that connects a moving elevator car to a fixed termination point in the hoistway is known as:

Question 14: NEC 620.6 requires GFCI protection for 125V, single-phase, 15A and 20A receptacles located in which elevator-related spaces?

Question 15: NEC 645.4 permits the special wiring allowances of Article 645 (Information Technology Equipment) to be used only when:

Question 16: NEC 645.10 requires an information technology equipment room to have:

Question 17: When all the conditions of NEC 645.4 are met, what does NEC 645.5(E) permit for power cables under a raised floor in an information technology equipment room?

Question 18: NEC 640.9 permits flexible cords to be used for certain permanently installed audio equipment. How does this compare to the general rule in Article 400?

Question 19: Under NEC 600.5(B), what is the maximum branch-circuit rating for signs containing incandescent and fluorescent illumination, and for circuits supplying neon tubing installations?

Question 20: Which of the following is one of the conditions NEC 645.4 requires before the special wiring allowances of Article 645 can be used in an IT equipment room?

Question 21: Per NEC 620.53, the disconnecting means for an elevator car's lighting, receptacle(s), and ventilation power-supply conductors must be:

Question 22: The branch circuit supplying IT equipment in a room that meets NEC 645.4 has a total connected load of 16 A. Under NEC 645.5(A), what minimum ampacity must the branch-circuit conductors have?

Question 23: How does the NEC's approach to bare crane runway contact conductors (Article 610) differ from its approach to overhead service conductors (Article 230)?

Question 24: NEC 620.37 generally restricts what may be installed within an elevator hoistway?

Question 25: A rooftop channel-letter sign is supplied from a panelboard on the floor below, and the branch-circuit breaker is not within sight of the sign. Which arrangement complies with NEC 600.6(A)?

Key NEC References for This Test

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