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MASTER NEC 2023

Master Electrician Practice Test 28 – Temporary Wiring & Special Events

This is Master Electrician Practice Test 28 — Temporary Wiring & Special Events, covering NEC Article 590 (temporary wiring for construction and decorative lighting) alongside a review of Article 525's carnival and fair wiring rules. The test has 25 multiple-choice questions on time limits for different types of temporary installations, GFCI protection on job sites, removal requirements, and how "temporary" changes duration rules without eliminating basic safety requirements. 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

Temporary Wiring & Special Events

How this test works

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

Construction-site temporary wiring — permitted for the duration of the work (NEC 590.3(A))
Holiday decorative lighting — limited to 90 days (NEC 590.3(B))
All temporary wiring removed immediately once its purpose ends (NEC 590.3(D))
GFCI protection for all 125V 15/20/30A receptacles used by personnel (NEC 590.6)
GFCI applies to both non-permanent and permanent-wiring receptacles used temporarily (NEC 590.6)
Listed GFCI cord sets/devices as an alternative (NEC 590.6)
Assured Equipment Grounding Conductor Program (AEGCP) as a documented site alternative
Scope of Article 590 — construction, remodeling, maintenance, repair, demolition, decorative lighting
Temporary wiring must still be adequately supported and protected (NEC 590.4)
Overcurrent protection still required for temporary circuits
Flexible cords for temporary wiring — permitted, but must be protected from damage
Temporary wiring still needs a disconnecting means
Temporary construction lighting — guarded against accidental contact and damage
Carnivals, circuses, and fairs — GFCI protection for portable structures (NEC Article 525)
Carnival/fair disconnecting means within sight of equipment (NEC Article 525)
Scenario — a GFCI panel left up for months after job completion
Scenario — a holiday lighting display left up well past 90 days
Why GFCI protection matters especially on construction sites
How AEGCP differs philosophically from GFCI protection
"Temporary" affects duration rules, not fundamental safety requirements
Scenario — a permanent-wiring receptacle used temporarily during construction
Two different time-limit regimes under one article
Relationship between Article 590 and the rest of the NEC
Scope of Article 525 — carnivals, circuses, fairs, and similar attractions
Comparing Article 590 and Article 525's shared safety philosophy

Tip: "Temporary" in the NEC only ever changes how long something can stay installed — it never excuses skipping GFCI protection, support, overcurrent protection, or a proper disconnect. Keep that distinction in mind and Article 590 becomes much more predictable.

Questions

45 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Master Electrician Practice Test 28 – Temporary Wiring & Special Events — Question List

Question 1: Under NEC 590.3(A), how long may temporary wiring remain installed on an active construction site?

For the duration of the construction/remodeling/maintenance/repair/demolition work
A fixed 30 days, regardless of the job's progress
A fixed 90 days, regardless of the job's progress
Indefinitely, with no requirement to ever remove it

NEC Reference: NEC 590.3(A)

Question 2: NEC 590.3(B) limits temporary electric power and lighting installed for holiday decorative purposes to a maximum of:

30 days
60 days
90 days
1 year

NEC Reference: NEC 590.3(B)

Question 3: NEC 590.3(D) requires temporary wiring to be removed:

Immediately once its purpose has been fulfilled
Only after exactly one calendar year
Never — temporary wiring may remain indefinitely
Only when a new tenant moves in

NEC Reference: NEC 590.3(D)

Question 4: NEC 590.6 requires which receptacles used by personnel on a construction site to have GFCI protection?

All 125V, 15A/20A/30A receptacles used by personnel
Only 480V three-phase receptacles
No receptacles require GFCI protection on a construction site
Only receptacles installed indoors

NEC Reference: NEC 590.6

Question 5: A receptacle is already part of the building's permanent wiring, but the contractor uses it temporarily to power tools during construction. Does NEC 590.6 still require GFCI protection on that receptacle?

Yes — GFCI protection follows the temporary use, regardless of the wiring's permanent/temporary status
No — permanent wiring is always exempt from this requirement
Only if the receptacle is outdoors
Only on weekends

NEC Reference: NEC 590.6

Question 6: NEC 590.6 permits which alternative to a GFCI-protected receptacle for a portable tool on a job site?

A listed GFCI cord set or in-line device identified for portable use
Removing the equipment grounding conductor entirely
A device with no listing of any kind
There is no acceptable alternative under any circumstance

NEC Reference: NEC 590.6

Question 7: What is an Assured Equipment Grounding Conductor Program (AEGCP), as recognized in NEC Article 590?

A documented program of regularly testing equipment grounding conductor continuity
A program that eliminates the need for any grounding at all
A program that only applies to lighting fixtures
A brand name for a specific GFCI receptacle

NEC Reference: NEC Article 590

Question 8: NEC Article 590 primarily applies to which types of installations?

Construction, remodeling, maintenance, repair, demolition, and decorative lighting
Permanent service entrance conductors
Elevator machine rooms
Swimming pool bonding

NEC Reference: NEC Article 590

Question 9: NEC 590.4 requires temporary wiring to be:

Adequately supported and protected from physical damage
Left lying unsupported on the ground
Exempt from all support requirements
Run only through standing water

NEC Reference: NEC 590.4

Question 10: Does temporary wiring under NEC Article 590 still require overcurrent protection on its branch circuits and feeders?

Yes — overcurrent protection is still required
No — temporary circuits are completely exempt from overcurrent protection
Only if the job lasts more than a year
Only for circuits over 480V

NEC Reference: NEC Article 590

Question 11: Are flexible cords permitted for temporary wiring on a construction site under NEC Article 590?

Yes, but they must still be protected from physical damage
No, flexible cords are always prohibited for temporary wiring
Yes, with no protection considerations at all
Only if buried directly in the ground with no protection

NEC Reference: NEC Article 590

Question 12: Does a temporary power distribution setup on a construction site still need a disconnecting means?

Yes, a disconnecting means is still required
No, temporary wiring is exempt from all disconnect requirements
Only if the job site is larger than 10,000 sq ft
Only on federal construction projects

NEC Reference: NEC Article 590

Question 13: Temporary lighting used during construction should generally be:

Guarded against accidental contact and physical damage
Left completely exposed at head height with no guard
Submerged in any standing water on-site
Wired without any support whatsoever

NEC Reference: NEC Article 590

Question 14: What does NEC Article 525 require for portable structures used at carnivals, circuses, and fairs?

GFCI protection
No electrical protection of any kind
A dedicated 1000A service for every ride
Only bare, ungrounded wiring

NEC Reference: NEC Article 525

Question 15: NEC Article 525 requires the disconnecting means for a carnival ride or attraction to be located:

Within sight of the equipment
At least a mile away from the equipment
Nowhere — no disconnect is required for carnival equipment
Only inside a locked administrative office

NEC Reference: NEC Article 525

Question 16: A contractor finishes a renovation project but leaves the temporary GFCI-protected panel and cords in place for six more months "just in case another phase gets approved." Does this comply with NEC 590.3(D)?

No — it must be removed immediately once its purpose is fulfilled
Yes — leaving it up "just in case" is always acceptable
Yes — as long as it remains GFCI protected, duration does not matter
It depends only on whether the panel is painted a specific color

NEC Reference: NEC 590.3(D)

Question 17: A store leaves its holiday decorative lighting energized for 120 days after installation. Does this comply with NEC 590.3(B)?

No — 120 days exceeds the 90-day limit for decorative lighting
Yes — decorative lighting has no time limit at all
Yes — the limit only applies to lighting installed in December
It depends only on the wattage of the lights

NEC Reference: NEC 590.3(B)

Question 18: Why does the NEC place such heavy emphasis on GFCI protection specifically for construction-site wiring?

Job sites combine damage-prone equipment, wet conditions, and less oversight, raising ground-fault shock risk
Construction sites never actually have any electrical hazards
GFCI protection is only cosmetic and serves no safety function
Construction wiring is inherently safer than permanent wiring

NEC Reference: NEC 590.6

Question 19: How does an Assured Equipment Grounding Conductor Program (AEGCP) differ philosophically from GFCI protection?

GFCI detects faults in real time; AEGCP verifies grounding continuity through scheduled testing beforehand
They are functionally identical with no philosophical difference
AEGCP is a type of GFCI device sold under a different name
GFCI is a paperwork program and AEGCP is a physical device

NEC Reference: NEC Article 590

Question 20: What is the correct way to understand how "temporary" changes an installation's requirements under the NEC?

"Temporary" affects allowed duration, not the fundamental safety requirements
"Temporary" means no safety rules apply at all
"Temporary" installations require less grounding than permanent ones
"Temporary" and "permanent" are functionally identical terms

NEC Reference: NEC Article 590

Question 21: Which two distinct time-limit regimes exist within NEC 590.3, applying to different types of temporary installations?

Construction wiring tied to job duration (590.3(A)); decorative lighting capped at 90 days (590.3(B))
Both regimes use the exact same fixed 90-day cap with no distinction
Both regimes have no time limit whatsoever
The two regimes apply to indoor vs. outdoor installations only

NEC Reference: NEC 590.3

Question 22: How does NEC Article 590 relate to the rest of the National Electrical Code?

It modifies duration-related rules but still layers on top of the code's fundamental safety requirements
It completely replaces every other article in the NEC
It has no relationship to any other part of the NEC
It eliminates all grounding requirements for the duration of a project

NEC Reference: NEC Article 590

Question 23: NEC Article 525 primarily covers which type of occupancy?

Carnivals, circuses, fairs, and similar traveling attractions
Permanent office buildings
Health care facilities
Data center IT equipment rooms

NEC Reference: NEC Article 525

Question 24: What safety philosophy do NEC Article 590 (temporary wiring) and Article 525 (carnivals/fairs) share, despite covering very different settings?

Both lean heavily on GFCI protection and accessible/lockable disconnects for short-duration, high-turnover setups
Both articles ban GFCI protection entirely
Neither article addresses disconnects of any kind
The two articles share no safety philosophy at all

NEC Reference: NEC Article 590 / Article 525

Question 25: What is the single most important takeaway from NEC Article 590 for a master electrician overseeing a job site?

Temporary wiring must meet the same safety bar as permanent wiring, with broad GFCI use and prompt removal when no longer needed
Temporary wiring can ignore all NEC safety requirements
Temporary wiring never needs to be removed
GFCI protection is optional on construction sites

NEC Reference: NEC Article 590

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 28 – Temporary Wiring & Special Events

How this test works

Frequently Asked Questions

Before You Start

Topics in This Test

Electrician Reviews

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Key NEC References for This Test

Master Electrician Practice Test 28 – Temporary Wiring & Special Events

How this test works

Frequently Asked Questions

Is this Master Electrician Practice Test 28 – Temporary Wiring & Special Events 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 28 – Temporary Wiring & Special Events — Question List

Question 1: Under NEC 590.3(A), how long may temporary wiring remain installed on an active construction site?

Question 2: NEC 590.3(B) limits temporary electric power and lighting installed for holiday decorative purposes to a maximum of:

Question 3: NEC 590.3(D) requires temporary wiring to be removed:

Question 4: NEC 590.6 requires which receptacles used by personnel on a construction site to have GFCI protection?

Question 5: A receptacle is already part of the building's permanent wiring, but the contractor uses it temporarily to power tools during construction. Does NEC 590.6 still require GFCI protection on that receptacle?

Question 6: NEC 590.6 permits which alternative to a GFCI-protected receptacle for a portable tool on a job site?

Question 7: What is an Assured Equipment Grounding Conductor Program (AEGCP), as recognized in NEC Article 590?

Question 8: NEC Article 590 primarily applies to which types of installations?

Question 9: NEC 590.4 requires temporary wiring to be:

Question 10: Does temporary wiring under NEC Article 590 still require overcurrent protection on its branch circuits and feeders?

Question 11: Are flexible cords permitted for temporary wiring on a construction site under NEC Article 590?

Question 12: Does a temporary power distribution setup on a construction site still need a disconnecting means?

Question 13: Temporary lighting used during construction should generally be:

Question 14: What does NEC Article 525 require for portable structures used at carnivals, circuses, and fairs?

Question 15: NEC Article 525 requires the disconnecting means for a carnival ride or attraction to be located:

Question 16: A contractor finishes a renovation project but leaves the temporary GFCI-protected panel and cords in place for six more months "just in case another phase gets approved." Does this comply with NEC 590.3(D)?

Question 17: A store leaves its holiday decorative lighting energized for 120 days after installation. Does this comply with NEC 590.3(B)?

Question 18: Why does the NEC place such heavy emphasis on GFCI protection specifically for construction-site wiring?

Question 19: How does an Assured Equipment Grounding Conductor Program (AEGCP) differ philosophically from GFCI protection?

Question 20: What is the correct way to understand how "temporary" changes an installation's requirements under the NEC?

Question 21: Which two distinct time-limit regimes exist within NEC 590.3, applying to different types of temporary installations?

Question 22: How does NEC Article 590 relate to the rest of the National Electrical Code?

Question 23: NEC Article 525 primarily covers which type of occupancy?

Question 24: What safety philosophy do NEC Article 590 (temporary wiring) and Article 525 (carnivals/fairs) share, despite covering very different settings?

Question 25: What is the single most important takeaway from NEC Article 590 for a master electrician overseeing a job site?

Key NEC References for This Test

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