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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, EVSE service load calculations, 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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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 625.42)
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)
125% sizing seen the other way — EVSE load at 80% of the OCPD rating (NEC 625.41, 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)
Remote EVSE disconnect — location plaque and lockable open (NEC 625.43)
Permitted wiring methods for EVSE branch circuits (NEC Chapter 3)
EVSE nameplate marking requirements (NEC 625.15)
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
EVSE load in service calculations — 7,200 VA or nameplate, whichever is larger (NEC 220.57)
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
Worked calculation — EVSE load for a dwelling service (NEC 220.57)
Sizing to an adjusted EVSE setting — restricted access and marking (NEC 625.42(B))
EVEMS-controlled EVSE sized to the managed load (NEC 625.42(A)); GFCI for EV charging receptacles (NEC 625.54)

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 625.42 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 625.42

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: Because EV charging is a continuous load (625.42) and the OCPD must be rated at least 125% of the EVSE maximum load (625.41), an EVSE on a standard (not 100%-rated) breaker may draw no more than what percentage of that breaker's rating?

50%
80%
100%
125%

NEC Reference: NEC 625.41, 625.42

Question 7: A receptacle-connected EVSE is rated 40A on its nameplate. Per NEC 625.41, what minimum branch circuit rating does that receptacle need?

NEC Reference: NEC 625.41

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: Under NEC 625.43, EVSE rated more than 60 A or more than 150 V to ground has its disconnecting means installed remote from the equipment. What else is required?

Nothing else — a remote disconnect needs no marking
A plaque on the EVSE denoting the location of the disconnecting means, and the disconnect must be lockable open
The disconnect must be within 6 ft of the vehicle parking space
A second disconnect must be installed at the EVSE

NEC Reference: NEC 625.43

Question 11: EVSE branch circuits may be installed using 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 Chapter 3

Question 12: NEC 625.15 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 625.15

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: For feeder and service calculations, NEC 220.57 requires the load of EVSE to be calculated at the larger of:

5,000 W or the nameplate rating
7,200 W (VA) or the nameplate rating of the equipment
3,600 W or 80% of the nameplate rating
The nameplate rating only

NEC Reference: NEC 220.57

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: A dwelling service calculation includes one 48 A, 240 V EVSE. What load must be included for it under NEC 220.57?

7,200 VA
9,216 VA
11,520 VA
14,400 VA

NEC Reference: NEC 220.57

Question 23: An EVSE has adjustable current settings. Under NEC 625.42(B), when may the branch circuit be sized to the adjusted (lower) setting instead of the maximum rating?

Whenever the homeowner records the setting in the panel directory
Only when the EVSE is cord-and-plug connected
Whenever the setting can be changed through a public smartphone app
When access to the setting is restricted and the adjusted current rating is marked on the equipment

NEC Reference: NEC 625.42(B)

Question 24: Multiple EVSE are controlled by an EV energy management system (EVEMS) complying with Article 750. Under NEC 625.42(A), what is the maximum EVSE load used to size the branch circuit and feeder?

The maximum load permitted by the energy management system
The sum of all EVSE nameplate ratings, regardless of the EVEMS
50% of the combined nameplate ratings
The nameplate rating of the largest single EVSE only

NEC Reference: NEC 625.42(A), Article 750

Question 25: Per NEC 625.54, receptacles installed for the connection of electric vehicle charging must have:

AFCI protection only
No special protection, if on an individual branch circuit
GFCI protection for personnel
Surge protection only

NEC Reference: NEC 625.54

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

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Master Electrician Practice Test 26 – EV Charging Systems

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

Question 1: NEC 625.42 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: Because EV charging is a continuous load (625.42) and the OCPD must be rated at least 125% of the EVSE maximum load (625.41), an EVSE on a standard (not 100%-rated) breaker may draw no more than what percentage of that breaker's rating?

Question 7: A receptacle-connected EVSE is rated 40A on its nameplate. Per NEC 625.41, 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: Under NEC 625.43, EVSE rated more than 60 A or more than 150 V to ground has its disconnecting means installed remote from the equipment. What else is required?

Question 11: EVSE branch circuits may be installed using which general category of wiring methods?

Question 12: NEC 625.15 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: For feeder and service calculations, NEC 220.57 requires the load of EVSE to be calculated at the larger of:

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: A dwelling service calculation includes one 48 A, 240 V EVSE. What load must be included for it under NEC 220.57?

Question 23: An EVSE has adjustable current settings. Under NEC 625.42(B), when may the branch circuit be sized to the adjusted (lower) setting instead of the maximum rating?

Question 24: Multiple EVSE are controlled by an EV energy management system (EVEMS) complying with Article 750. Under NEC 625.42(A), what is the maximum EVSE load used to size the branch circuit and feeder?

Question 25: Per NEC 625.54, receptacles installed for the connection of electric vehicle charging must have:

Key NEC References for This Test

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