Temporary installations, NEC Article 590, and the belief that costs Texas candidates marks

What the exam asks about temporary power

Three items in the 500 question bank sit on this article or beside it. One puts receptacles in front of workers during construction, in rooms where the same receptacles would need nothing once the building is finished. One runs a flexible cord through a doorway used all day. One sets a traveling carnival up in a parking lot for a week and asks which article covers the wiring.

All three are one move deep and all three fall to somebody who has read the article once. The first answer is ground fault circuit interrupter protection for personnel on the receptacles the workers use. The second is protection for the cord where it passes the doorway. The third is Article 525, which belongs to carnivals, circuses, fairs and similar events.

On the published blueprint these land in the wiring methods and materials area, which carries 10 of the 56 scored items on the journeyman NEC Knowledge portion and is one of the three heaviest areas on that paper. The reading here pays back across a wide area, and the article is short enough to finish in one sitting.

The sentence the whole article hangs on

A temporary installation meets everything the code asks of a permanent one, except where Article 590 specifically says otherwise. That default sits near the front of the article, and every paragraph after it is either a named departure from the default or an addition on top of it.

Read that default backward and a whole family of items becomes unanswerable, because you go hunting for permission the article never grants. A candidate who believes temporary means relaxed takes the answer choice describing something sloppy, and that choice is in the item because the belief is common.

The article also leaves the authority having jurisdiction a say. A temporary wiring method is acceptable where it is approved for the conditions of service and for whatever is special about that installation, which is why two inspectors can reach two answers about the same detail in the same county.

Three permitted uses and one day count

Only the seasonal category carries a number of days. The other two run as long as the work or the event lasts, and the article attaches no calendar to either of them.

• Construction, remodeling, maintenance, repair and demolition. Wiring for this work runs for the period of the work, and no number of days attaches to it anywhere in the article.
• Holiday decorative lighting and similar purposes. This is the 90 days, and it is the only figure in days the time constraints contain.
• Emergencies, sharing one subsection with tests, experiments and developmental work. No period attaches to any of them, so load testing a standby generator and a flood that took out the service sit in the same paragraph.

So a day count in an Article 590 item does one job. It checks whether you attach 90 days to the seasonal lighting where it belongs, or hang it on a job trailer, a spider box, or a temporary pole up since spring. A fourth paragraph in the same block states the removal rule, which has its own section below.

Article 525 or Article 590

The carnival item is the cleanest scope question in this area. A traveling carnival sets up rides and concession stands in a parking lot for one week. Reading the word temporary in its plain sense sends you to Article 590, and the code splits these two by what the installation is for.

Article 525 is written for carnivals, circuses, fairs and similar events, and it carries its own rules on clearance from overhead conductors, on portable structures and rides, on ground fault protection, and on bonding the metal parts a member of the public can reach. Article 590 sits beside it and answers the temporary wiring used for construction, remodeling, maintenance and decorative lighting.

The other two wrong answers reach for general articles. Article 518 covers the building at a place of assembly, which leaves the rides alone. Article 210 is the branch circuit article every other article builds on, so naming it answers nothing specific. Deciding scope first is the move hazardous locations items reward too.

What Article 590 genuinely relaxes

The relief runs to getting conductors from the panel out to the work, and it stops there.

Feeders and branch circuits get latitude in the wiring methods open to them. Cable assemblies are on the list, so are cord and cable of the hard usage and extra hard usage types, and Type NM and Type NMC lose the height limit and the building construction limit that bind them in permanent work, with concealment left optional. The conditions attached turn on how high the conductors run, on what can drive into them, and on whether they are protected from damage.

A box is left optional for some splices. Where the circuit conductors are multiconductor cord or cable assemblies on a construction site and the equipment grounding path stays continuous, the splice can go without one. Support is looser too, with staples, ties and straps at whatever interval keeps the cable out of harm. Vegetation stays off the list of things a span may hang from, with one exception belonging to the seasonal category: holiday lighting can go up in a tree where it is rigged so the tree moving leaves the conductors undamaged.

That is the shape of the relief, and overcurrent protection and grounding and bonding sit outside it. Feeder protection still comes out of Article 240, receptacles still get a grounding terminal tied to an equipment grounding conductor, and a short job buys no exemption from either.

What temporary work gets on top

Ground fault protection for personnel is the addition candidates meet first, and the most tested paragraph in the article. Receptacle outlets in use by the people working on the site get it, because the site is wet, the tools take a beating, the cords get run over, and the grounding path on a building under construction is the least trustworthy one in the trade.

The feature that catches people is which receptacles it reaches. Coverage extends past the ones installed as part of the temporary wiring: a receptacle belonging to the permanent installation that is being used for construction power falls under the same protection, and the article gives that case a paragraph of its own. Read the voltage and ampere ratings off your own copy, and keep them separate from the ratings in 210.8, which is written on its own terms and has widened across recent editions.

For the outlets the receptacle rule leaves out, the article names an alternative. A written program of testing equipment grounding conductors and receptacles, enforced on the site, run to a schedule, with records kept, stands in place of devices. An item wants you to see that this is a program somebody runs, and a candidate carrying a rule of thumb that Article 590 relaxes nothing strikes that answer out and loses the mark.

More additions sit past that paragraph. Lamps for general illumination get a guard against accidental contact and breakage. Receptacles stay off the branch circuits feeding the temporary lighting, so one tool faulting leaves the lights on. Each temporary circuit gets a disconnecting means for its ungrounded conductors, and a multiwire branch circuit gets a way to open all of them together, the same idea disconnecting means items keep returning to.

The removal rule and how it is tested

Temporary wiring comes out immediately on completion of the construction, or of whatever purpose it went in for. That sentence catches people in the field constantly. Temporary lighting that stayed up for the tenant. A spider box left on a column after the crew moved on. A temporary panel that quietly became the permanent panel for a shop bay.

On the exam it catches people differently. An item describes an installation that was compliant while the job ran, says the job finished, and asks about its status. The answer turns on the permission having expired, and how the thing was built stays beside the point.

This is the cleanest example of what the whole article is saying: temporary describes a condition with a beginning and an end.

What this costs on a Texas job

Temporary power goes in first on a Texas job and stays visible. Tex. Occ. Code 1305.201(d) has electrical work inside the corporate limits installed in accordance with all applicable local ordinances, and 1305.201(c) lets a municipality adopt procedures for local amendments and for enforcing them. So the text governing your temporary pole is the state adopted edition plus whatever the city wrote on top.

One bar runs the other way and is worth knowing before you pay anybody. Tex. Occ. Code 1305.201(f) stops a municipality or region from collecting a permit fee, registration fee, administrative fee or any other fee from an electrician holding a license under Chapter 1305 for work performed there, while leaving the building permit fee for the work itself in place. A city registration fee paid out of habit is worth a phone call.

The enforcement side sets the price of getting it wrong. TDLR publishes an enforcement plan sorting violations into four classes, and performing electrical work without a license lands in Class C, a fine between $2,000 and $5,000 plus one year of probated suspension up to revocation. Chapter 1305 sets no penalty figure of its own, so Tex. Occ. Code 51.302(a) supplies the ceiling at $5,000 per day for each violation, each day counted separately.

An hour, and where to put it

This article is short, which is the argument for reading it end to end. Texas adopts the 2026 National Electrical Code on 1 September 2026 under 16 TAC 73.100 and the examinations follow that day, so check the ratings in a 2026 book.

1. Read Article 590 front to back in one sitting. It is one of the few articles in the book you can do that with.
2. Mark the sentence saying the rest of the code still applies. Most items are built against it.
3. Mark the time constraints and write 90 beside the seasonal paragraph alone. Leave the construction paragraph and the emergency paragraph bare, because that blankness is the answer to a whole class of items.
4. Mark the ground fault paragraph, note the ratings your copy gives, and find the paragraph covering receptacles belonging to the permanent wiring.
5. Mark the removal sentence. It is short and it is easy to walk past.
6. Find rules in this article by heading, because at least one paragraph inside Article 590 sits at a different number in the 2026 edition than it did in 2023.

The section by section walk through, with the worked examples, lives in the question set. This page carries what the item looks like and what the rule costs you in Texas.

Questions people ask

Does the 90 day limit in Article 590 apply to a construction site?

No. The 90 days belongs to holiday decorative lighting and similar purposes, and it is the only figure in days the time constraints in Article 590 contain. Wiring for construction, remodeling, maintenance, repair and demolition runs for the period of the work, with no day count attached anywhere. The subsection covering emergencies, tests, experiments and developmental work carries no period either. So a day count in an item is checking whether you hang 90 days on a job trailer or a temporary pole, which is where it does not belong.

Do temporary receptacles need GFCI protection during construction?

Yes, and that is the most tested paragraph in the article. Receptacle outlets in use by the people working on the site get ground fault circuit interrupter protection for personnel, even in rooms where the same receptacles would need nothing once the building is occupied. The protection follows the activity. Coverage also reaches receptacles that belong to the permanent installation where they are being used for construction power, and the article gives that case its own paragraph. Read the voltage and ampere ratings off your own 2026 copy.

What can stand in place of GFCI devices on a job site?

A written program of testing equipment grounding conductors and receptacles, enforced on the site, run to a schedule, with records kept. Article 590 names it for the outlets the receptacle rule leaves out. An item is testing whether you see that this is a program somebody runs, and a candidate carrying a rule of thumb that Article 590 adds requirements without ever offering an alternative will strike it out. The exam rewards reading the article over reasoning from the word temporary, which is the pattern across the whole of 590.

Which article covers a traveling carnival, 525 or 590?

Article 525, which is written for carnivals, circuses, fairs and similar events. It carries its own rules on clearance from overhead conductors, on portable structures and rides, on ground fault protection, and on bonding the metal parts the public can reach. Article 590 sits beside it and covers temporary wiring for construction, remodeling, maintenance and decorative lighting. Both are temporary in plain speech, and the code splits them by what the installation is for. Article 518 covers the building at a place of assembly, which leaves the rides alone.

When does temporary wiring have to come out?

Immediately on completion of the construction, or of whatever purpose the installation went in for. Article 590 states it as a flat rule, so the convenience of the contractor plays no part. On the exam the item usually describes an installation that was compliant while the job ran, tells you the job finished, and asks about its status. The answer turns on the permission having expired. On a Texas job the same sentence is what an inspector points at when temporary lighting is still up for the tenant.

Can a Texas city charge me a registration fee to pull temporary power?

Tex. Occ. Code 1305.201(f) bars a municipality or region from collecting a permit fee, registration fee, administrative fee or any other fee from an electrician who holds a license under Chapter 1305 for work performed in that municipality or region. The same subsection leaves a building permit fee for the work itself in place. Cities keep their amendment and inspection powers under 1305.201(c) and (d), so the code text governing your temporary pole is the state adopted edition plus local amendments. Ask which amendments apply before you price the job.