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MASTER NEC 2023

Master Electrician Practice Test 26 – EV Charging Systems

This is Master Electrician Practice Test 26 — EV Charging Systems, covering NEC Article 625, one of the fastest-growing parts of the code as electric vehicle charging moves from a rare add-on to a standard feature in new construction. The test has 25 multiple-choice questions on continuous-load sizing, dedicated branch circuits, receptacle-connected EVSE ratings, disconnect requirements, nameplate marking, and load management systems. 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

EV Charging Systems

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Read each question carefully

Look for absolute words like always / never — they often distinguish the right answer.

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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

EV charging loads are always treated as continuous loads (NEC 625.41)
Branch circuit/OCPD sized at 125% of maximum EVSE load (NEC 625.41)
Exception — 100%-rated assemblies skip the 125% multiplier (NEC 625.41)
Individual branch circuit required above 16A or 120V (NEC 625.40)
No individual branch circuit required at or below 16A/120V (NEC 625.40)
Receptacle-connected EVSE nameplate limited to 80% of branch circuit rating (NEC 625.42)
Calculating the minimum branch circuit for a given EVSE nameplate rating
Disconnect required for EVSE over 60A or over 150V to ground (NEC 625.43)
Cord and plug serving as the disconnect for smaller EVSE (NEC 625.43)
Portable EVSE disconnect must be lockable open (NEC 625.44(A))
Permitted wiring methods for EVSE circuits (NEC 625.44)
EVSE nameplate marking requirements (NEC 625.5)
Adjustable EVSE ampere settings must be reflected on the rating label
Scenario — a load-managed EVSE commissioned below its factory maximum
Why EV charging loads are treated as continuous
Scope of Article 625 — electric vehicle charging and supply equipment
Wireless power transfer equipment (WPTE) also falls under Article 625
Bidirectional (vehicle-to-grid) equipment and Article 705 interconnection
Load management (EVEMS) systems limiting EVSE output
Scenario — multiple EVSE units sharing one panel
Why EVSE generally does not need battery-charging ventilation like older lead-acid systems
Worked calculation — continuous EVSE load sizing
What Article 625 actually regulates — equipment external to the vehicle
The recurring 125% continuous-load pattern across the NEC
Comparing EVSE circuit rules to other continuous-load equipment articles

Tip: Article 625 leans hard on one idea you have already seen throughout this series: EV charging loads are continuous by definition, so the 125% sizing rule almost always applies. Once you accept that starting point, most of the rest of the article is just working out the details around it.

Questions

45 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Master Electrician Practice Test 26 – EV Charging Systems — Question List

Question 1: NEC 625.41 requires electric vehicle charging loads to always be treated as:

Continuous loads
Noncontinuous loads
Loads exempt from any sizing rule
Standby loads only

NEC Reference: NEC 625.41

Question 2: An EVSE has a maximum load of 32A. Under NEC 625.41, what minimum branch circuit and OCPD rating is required?

32A
36.8A
40A
64A

NEC Reference: NEC 625.41

Question 3: NEC 625.41 permits skipping the 125% continuous-load multiplier for EVSE circuits when:

The assembly, including its OCPDs, is listed for 100% continuous operation
The vehicle is fully charged before the circuit is energized
The installation is outdoors
The EVSE is cord-and-plug connected, with no other condition

NEC Reference: NEC 625.41

Question 4: NEC 625.40 requires an outlet supplying EVSE to be on its own individual branch circuit when the EVSE is rated above:

16A or 120V
60A or 300V
100A or 480V
There is no threshold — every EVSE outlet always needs its own circuit

NEC Reference: NEC 625.40

Question 5: A cord-and-plug-connected EVSE is rated at 12A, 120V. Does NEC 625.40 require this outlet to have its own individual branch circuit?

No — at or below 16A/120V, an individual branch circuit is not required
Yes — every EVSE outlet always needs its own circuit regardless of rating
Yes — but only if installed outdoors
No — EVSE outlets never need any dedicated circuit at any rating

NEC Reference: NEC 625.40

Question 6: Under NEC 625.42, a receptacle-connected EVSE's nameplate rating is limited to what percentage of the branch circuit's rating?

50%
80%
100%
125%

NEC Reference: NEC 625.42

Question 7: A receptacle-connected EVSE is rated 40A on its nameplate. Per NEC 625.42, what minimum branch circuit rating does that receptacle need?

NEC Reference: NEC 625.42

Question 8: NEC 625.43 requires a dedicated disconnecting means for EVSE rated above:

60A or 150V to ground
15A or 120V
400A or 600V
There is no threshold in the 2023 NEC

NEC Reference: NEC 625.43

Question 9: For cord-and-plug-connected EVSE rated at or below 60A and 150V to ground, NEC 625.43 permits which of the following to serve as the disconnecting means?

The cord and plug
A separate 400A safety switch, always
The main service disconnect only
No disconnect is permitted for cord-and-plug EVSE

NEC Reference: NEC 625.43

Question 10: NEC 625.44(A) requires a disconnecting means for portable EVSE to be:

Capable of being locked in the open position
Automatically reset every 30 seconds
Rated at exactly 15A regardless of the EVSE
Prohibited from ever being locked

NEC Reference: NEC 625.44(A)

Question 11: NEC 625.44 permits EVSE circuits to use which general category of wiring methods?

Standard Chapter 3 wiring methods, such as EMT and rigid metal conduit
Bare conductors with no raceway of any kind
Only Class 2 low-voltage cable
No wiring method is recognized for EVSE circuits

NEC Reference: NEC 625.44

Question 12: NEC 625.5 requires EVSE to be legibly marked with which of the following?

Manufacturer, model, rated voltage, rated current, and frequency
Only the manufacturer's stock ticker symbol
Only the shipping weight
Nothing — EVSE marking is entirely optional

NEC Reference: NEC 625.5

Question 13: An EVSE ships from the factory rated at 48A, but a load management system commissions it to operate at only 32A on-site. What does the nameplate/rating label need to reflect?

The actual commissioned rating (32A), via an updated or supplemental label
The original 48A factory rating only, with no update needed
No marking is required after commissioning
A random rating chosen by the installer

NEC Reference: NEC 625.5

Question 14: Why does NEC Article 625 classify EV charging loads as continuous rather than evaluating each charging session individually?

Because a charging session typically runs for hours at a steady draw, matching the continuous-load pattern
Because EV chargers never actually draw current
Because continuous-load rules were removed from the 2023 NEC
Because EVs charge instantly with no time component

NEC Reference: NEC 625.41

Question 15: NEC Article 625 primarily governs which equipment?

Electric vehicle charging and supply equipment external to the vehicle
The vehicle's internal battery management system
Swimming pool pumps
Fire alarm circuits

NEC Reference: NEC Article 625

Question 16: Besides plug-in cable-connected EVSE, what other charging technology does NEC Article 625 explicitly cover?

Wireless power transfer equipment (WPTE)
Elevator hydraulic systems
Swimming pool heaters
Household range circuits

NEC Reference: NEC Article 625

Question 17: A bidirectional EVSE is capable of exporting power from a vehicle's battery back into a building's premises wiring. What additional NEC article generally applies to that export function?

Article 705 — Interconnected Electric Power Production Sources
Article 250 — Grounding and Bonding, and nothing else
Article 800 — Communications Circuits
No other article ever applies to bidirectional EVSE

NEC Reference: NEC Article 625 / Article 705

Question 18: What does an EV energy management system (EVEMS) do in a multi-charger installation?

It limits the combined output of multiple EVSE units to manage total demand
It disables all EVSE units permanently after installation
It has no effect on circuit sizing whatsoever
It only works for a single EVSE unit and never multiple units

NEC Reference: NEC 625.42 / Article 750

Question 19: A parking garage installs six EVSE units on one panel, each individually rated 40A. Without a listed load management system, how must the panel generally be sized?

Sized for the full simultaneous load of all six units at once
Sized for only one unit, ignoring the other five
No sizing calculation is needed for EVSE panels
Sized at a random fraction chosen by the installer

NEC Reference: NEC 625.42

Question 20: Why does a modern EVSE installation generally not need the same battery-charging ventilation rules used for older lead-acid battery charging equipment?

Sealed lithium-ion vehicle batteries do not off-gas explosive hydrogen the way flooded lead-acid batteries can
EVs never actually contain any battery at all
Ventilation rules were entirely removed from the NEC in 2023
EVSE installations are always required to be outdoors

NEC Reference: NEC Article 625 / Article 480

Question 21: A hardwired EVSE has a maximum load of 48A. What minimum ampacity is required for its branch-circuit conductors and OCPD under NEC 625.41?

48A
55.2A
60A
96A

NEC Reference: NEC 625.41

Question 22: What is the primary subject matter of NEC Article 625, stated broadly?

Electric vehicle charging and supply equipment
Residential kitchen appliances
Data center IT equipment rooms
Manufactured wiring systems

NEC Reference: NEC Article 625

Question 23: Which pattern from earlier in this practice series also shows up throughout NEC Article 625?

The 125% continuous-load sizing rule
A rule unique to EV charging with no equivalent elsewhere in the NEC
A rule that only ever appears in Article 625
A prohibition on all continuous loads

NEC Reference: NEC 625.41 / Article 220 / Article 424 / Article 440

Question 24: Comparing EVSE disconnect rules to A/C equipment disconnect rules from earlier in this practice series, what similarity stands out?

Both allow the cord/plug to serve as the disconnect below a size threshold, requiring a dedicated disconnect above it
Neither article ever requires a disconnecting means of any kind
Both articles require a disconnect only for equipment under 5A
There is no similarity between the two articles at all

NEC Reference: NEC 625.43 / NEC 440.63

Question 25: What overall theme ties together NEC 625.40, 625.41, 625.42, 625.43, and 625.5?

Familiar general NEC principles applied specifically to EV charging equipment
A completely new set of concepts with no relationship to the rest of the NEC
Rules that apply only to gasoline-powered vehicles
Rules that have nothing to do with continuous loads or disconnects

NEC Reference: NEC Article 625

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 26 – EV Charging Systems

How this test works

Frequently Asked Questions

Before You Start

Topics in This Test

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Key NEC References for This Test

Master Electrician Practice Test 26 – EV Charging Systems

How this test works

Frequently Asked Questions

Is this Master Electrician Practice Test 26 – EV Charging Systems free?

How do I qualify for the Master Electrician exam?

What is covered on the Master Electrician exam?

How is the Master exam different from the Journeyman exam?

Before You Start

Topics in This Test

Electrician Reviews

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Master Electrician Practice Test 26 – EV Charging Systems — Question List

Question 1: NEC 625.41 requires electric vehicle charging loads to always be treated as:

Question 2: An EVSE has a maximum load of 32A. Under NEC 625.41, what minimum branch circuit and OCPD rating is required?

Question 3: NEC 625.41 permits skipping the 125% continuous-load multiplier for EVSE circuits when:

Question 4: NEC 625.40 requires an outlet supplying EVSE to be on its own individual branch circuit when the EVSE is rated above:

Question 5: A cord-and-plug-connected EVSE is rated at 12A, 120V. Does NEC 625.40 require this outlet to have its own individual branch circuit?

Question 6: Under NEC 625.42, a receptacle-connected EVSE's nameplate rating is limited to what percentage of the branch circuit's rating?

Question 7: A receptacle-connected EVSE is rated 40A on its nameplate. Per NEC 625.42, what minimum branch circuit rating does that receptacle need?

Question 8: NEC 625.43 requires a dedicated disconnecting means for EVSE rated above:

Question 9: For cord-and-plug-connected EVSE rated at or below 60A and 150V to ground, NEC 625.43 permits which of the following to serve as the disconnecting means?

Question 10: NEC 625.44(A) requires a disconnecting means for portable EVSE to be:

Question 11: NEC 625.44 permits EVSE circuits to use which general category of wiring methods?

Question 12: NEC 625.5 requires EVSE to be legibly marked with which of the following?

Question 13: An EVSE ships from the factory rated at 48A, but a load management system commissions it to operate at only 32A on-site. What does the nameplate/rating label need to reflect?

Question 14: Why does NEC Article 625 classify EV charging loads as continuous rather than evaluating each charging session individually?

Question 15: NEC Article 625 primarily governs which equipment?

Question 16: Besides plug-in cable-connected EVSE, what other charging technology does NEC Article 625 explicitly cover?

Question 17: A bidirectional EVSE is capable of exporting power from a vehicle's battery back into a building's premises wiring. What additional NEC article generally applies to that export function?

Question 18: What does an EV energy management system (EVEMS) do in a multi-charger installation?

Question 19: A parking garage installs six EVSE units on one panel, each individually rated 40A. Without a listed load management system, how must the panel generally be sized?

Question 20: Why does a modern EVSE installation generally not need the same battery-charging ventilation rules used for older lead-acid battery charging equipment?

Question 21: A hardwired EVSE has a maximum load of 48A. What minimum ampacity is required for its branch-circuit conductors and OCPD under NEC 625.41?

Question 22: What is the primary subject matter of NEC Article 625, stated broadly?

Question 23: Which pattern from earlier in this practice series also shows up throughout NEC Article 625?

Question 24: Comparing EVSE disconnect rules to A/C equipment disconnect rules from earlier in this practice series, what similarity stands out?

Question 25: What overall theme ties together NEC 625.40, 625.41, 625.42, 625.43, and 625.5?

Key NEC References for This Test

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