17.2 Elevators & Electric Vehicle Power Transfer

Two Articles, One Special-Equipment Cluster

On the Arkansas Prov JW exam (NEC 2023, 60Q / 3 hr / 70%), elevators and electric vehicle power transfer both land in Special Occupancies and Equipment thinking, but they live in different articles:

Tab 620.22–620.25, 620.51, 620.85, and 625.40–625.42 (and nearby sizing/protection sections). Article 430 still matters for motor FLC background, but 620 modifies and organizes elevator wiring as a system.

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Article 620 — Elevators and Related Equipment

Scope and Voltage

Article 620 covers the installation of electrical equipment and wiring used in connection with elevators, dumbwaiters, escalators, moving walks, platform lifts, and stairway chairlifts. Voltage limitations appear in 620.3 and related sections — know that different parts of the elevator system (power, lighting, control, traveling cable) have distinct wiring method and voltage contexts. For exam day, identity beats memorizing every millivolt: if the stem says “elevator machine room controller,” open 620, not 430 alone.

Motor Controllers and Disconnects — 620.51

620.51 requires a disconnecting means for the elevator drive/controller power:

• Located where it is readily accessible to qualified persons
• Within sight of the controller (Article 100: visible and ≤ 50 ft)
• Capable of being locked in the open position
• Opens all ungrounded conductors
• No other loads on the load side of that disconnect (elevator power disconnect is dedicated to that elevator equipment as the section describes)

Multiple elevators may each need their own disconnect. A single building main breaker that is not within sight of the controller — and not arranged as the required lockable elevator disconnect — fails the 620.51 test even if it can de-energize the feeder.

Exam trap: Using the motor disconnect rules from 430.102 without checking the elevator-specific within sight of the controller and lockable language in 620.51.

Separate Circuits — Car, Machine Room, and Pit

Article 620 requires separate branch circuits for several elevator-related loads. Typical Prov recognition points:

• Car lights, receptacles, ventilation, and heating/air-conditioning on the car generally need their own circuit(s), not the hoist-motor feeder.
• Machine room / control room / control space lighting and receptacles are supplied so that loss of the elevator power circuit does not plunge the room into darkness or remove the only receptacle — follow 620.22 / 620.23 style separation rules in the 2023 text.
• Pit lighting and receptacles have their own requirements; receptacles in pits, machine rooms, and similar spaces generally require GFCI protection (620.85 and related).

Think life-safety and maintenance: a mechanic in the pit needs light and a GFCI receptacle even if the elevator main is locked out.

Traveling Cables and Wiring Methods

Traveling cables between the car and the hoistway raceway are a hallmark of Article 620. They must be listed for the purpose, supported, and limited in what circuits they may carry. Hoistway wiring methods are restricted; you do not freely run ordinary NM cable through the hoistway as if it were a dwelling basement. On open-book items, if the stem mentions traveling cable conductor count or permitted circuits, stay inside Article 620 Parts covering wiring.

Working Space and Guarding

Controllers and disconnects still need working space per 110.26 unless Article 620 provides a specific modification. Guarding of live parts and motor rooms as restricted spaces matters for AHJ practice; Prov stems usually stick to disconnect location, circuit separation, and GFCI.

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Article 625 — Electric Vehicle Power Transfer Systems

Scope

Article 625 covers the electrical conductors and equipment connecting an electric vehicle to premises wiring for charging (and, where covered, power export / bidirectional systems). The utilization equipment is commonly called EVSE (Electric Vehicle Supply Equipment). Cord-and-plug EVSE and permanently connected EVSE both appear in stems.

Branch-Circuit Sizing — Continuous Load

EV charging is treated as a continuous load for branch-circuit and feeder calculations unless a specific exception applies. The usual Prov math path:

1. Read the EVSE maximum load / nameplate current (or the adjustable setting if the listing and 625 rules allow a supervised setting).
2. Size branch-circuit conductors and overcurrent protection at not less than 125% of that continuous current (625.40 / continuous-load rules as applied in Article 625).

Example pattern: An EVSE nameplate maximum of 32 A continuous → conductors and OCPD based on 40 A (32 × 1.25). Verify conductor ampacity after temperature and bundling adjustments from Article 310 / 210, but the 125% continuous factor is the Article 625 gate.

Exam trap: Sizing a 32 A EVSE on a 30 A breaker “because the car never draws that much” — Code uses the EVSE rating and continuous-load multiplier, not informal diversity.

Disconnecting Means and Personnel Protection

Article 625 requires a disconnecting means for permanently connected EVSE, located and identified per the section (often within sight or lockable/remote as allowed). Personnel protection against shock — GFCI or a listed personnel protection system integral to the EVSE — is a core requirement for AC Level systems. Do not omit GFCI/personnel protection because “it’s outdoors and WR.” Outdoor listing and personnel protection are separate issues.

Location, Cable Management, and Ventilation

Outdoor EVSE needs wet-location suitability. Cable connectors and interactive cable management must not create trip hazards or damaged cords. Older Code editions emphasized ventilation for certain non-conductive charging methods; modern conductive Level 2 EVSE stems usually focus on ampacity, disconnect, and personnel protection rather than garage CFM calculations — read the stem for which hazard is being tested.

Interactive / bidirectional power transfer (vehicle-to-grid or vehicle-to-home) adds interconnection and islanding concerns that may cross into Articles 705 / 710 territory. If the stem is only “Level 2 wall charger for a dwelling garage,” stay in 625.

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How Prov Mixes 620, 625, and 430

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Arkansas Prov Takeaway

For elevators: lockable disconnect within sight of the controller, separate lighting/receptacle circuits, and GFCI where 620 requires it. For EVSE: treat the load as continuous (125%), provide the proper disconnect, and ensure personnel protection. Identity the equipment before you reach for Article 430 general motor rules.