Short answer: Article 525 covers the portable wiring and equipment of carnivals, circuses, fairs and similar events, including wiring in and on their structures (NEC 525.1). Portable structures are kept at least 15 feet in any direction from overhead conductors, except the conductors that supply them, with a stricter placement rule near higher-voltage lines (NEC 525.5). Each ride or other portable structure has a disconnecting means within sight of and within 6 feet of the operator’s station (NEC 525.21). Flexible cords and cables are listed for extra-hard usage (NEC 525.20(A)), and GFCI protection is required for the receptacles and equipment the section names, such as 125 V, 15 and 20 A receptacles readily accessible to the public (NEC 525.23).
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Tsai Electro is an independent learning site. Not affiliated with TDLR, PSI or NFPA. We explain the ideas in our own words and do not reproduce NEC text. Check every rule and table value in your own 2026 NEC, and follow your supervisor and the local inspector.
Why a fair has its own article
A carnival is set up in days, moved every week and walked through by crowds. Cords lie where people step, rides move, and power may come from more than one source. Article 525 is written for that. For construction site temporary power, the rules are in Article 590, covered in NEC 590 temporary wiring; an event setup follows Article 525.
The numbers to know
| Rule | Value | Where |
|---|---|---|
| Portable structure to overhead conductors (not the supply to that structure) | At least 15 ft in any direction | (NEC 525.5) |
| Near higher-voltage overhead lines | Not under them or within 15 ft horizontally; check the voltage threshold | (NEC 525.5) |
| Ride or structure disconnect | Within sight of and within 6 ft of the operator’s station | (NEC 525.21) |
| Single-conductor cable | Only in the sizes the section allows | (NEC 525.20(B)) |
| Outdoor portable distribution or termination box | Weatherproof, mounted with the bottom of the enclosure raised above the ground as the section requires | (NEC 525.22) |
Rides, disconnects and power sources
- Ride disconnect. The disconnect is within sight of and within 6 feet of the operator’s station, readily accessible to the operator even while the ride runs. Where it is accessible to the public, it is lockable or locked as the section requires. The section also describes a shunt trip method controlled from the operator’s console (NEC 525.21).
- Power sources. Services follow Article 230 and separately derived systems follow Article 250 (NEC 525.10).
- Multiple sources. Where more than one service or separately derived system supplies portable structures that are close together, the equipment grounding conductors of those sources are bonded together at the structures. The section sets the distance that triggers the rule and how the bonding conductor is sized (NEC 525.11). This keeps two pieces of metal a person can touch at once at the same potential.
Cords, cables and boxes
- Flexible cords and cables are listed for extra-hard usage; outdoors they are also listed for wet locations and sunlight resistant (NEC 525.20(A)).
- Cord connectors are not laid on the ground unless listed for wet locations, and cords accessible to the public are arranged to reduce tripping hazards, which the section allows to be covered with nonconductive matting; check the exact conditions in 525.20.
- A box or fitting goes at each connection point, outlet, switch point or junction point, and the section limits splices in flexible cords between boxes. Read 525.20 in full; it has more items than this list.
GFCI
GFCI protection is required for the 125 V, single-phase, 15 and 20 A receptacles the section names, such as those readily accessible to the general public, and for equipment readily accessible to the public supplied from those circuits (NEC 525.23). The section also lists cases where GFCI is not required, such as certain locking receptacles, and egress lighting is not protected by a GFCI, so a trip does not put the exit path in the dark. Check all of 525.23 for the exact conditions.
Worked example: is this ride placed correctly?
A ride is set up 12 feet horizontally from an overhead power line on the fairground that does not supply the ride.
- Rule. Portable structures stay at least 15 feet in any direction from overhead conductors that are not their own supply (NEC 525.5).
- Compare. 12 feet is less than 15 feet.
- Result. Not compliant. Move the ride so it is at least 15 feet away, and check the stricter rule if the line is above the voltage threshold in the section.
The ride’s disconnect is mounted 10 feet from the operator’s station, in sight. Within sight is met, but 10 feet is more than 6 feet, so the disconnect location is not compliant.
Check yourself
- How close may a portable ride be to an overhead line that does not supply it? Not closer than 15 feet in any direction.
- Where is a ride’s disconnect located? Within sight of and within 6 feet of the operator’s station.
- Is egress lighting at a fair put on GFCI protection? No. Article 525 keeps egress lighting off GFCI protection.
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Find Article 525 faster on exam day
NFPA 70, National Electrical Code, 2026 Edition (softcover). Underline “15 ft” in 525.5 and “6 ft” in 525.21 in the same color, so the two distance rules in this article are easy to tell apart. The Texas exam is open book. PSI allows a soft-bound NEC with highlighting, underlining and notes made in advance. Loose-leaf, spiral-bound and ring-bound copies are not allowed, and only permanent index tabs made or supplied by the NEC publisher are permitted; homemade and third-party tabs are not.
FAQ
What does NEC Article 525 cover?
Portable wiring and equipment for carnivals, circuses, fairs and similar functions, including wiring in or on their structures.
How far must a carnival ride be from overhead power lines?
At least 15 feet in any direction from overhead conductors other than its own supply, with a stricter placement rule near higher-voltage lines.
Where must a ride disconnect be?
Within sight of and within 6 feet of the operator’s station, readily accessible to the operator.
What cords are allowed at a fair?
Flexible cords and cables listed for extra-hard usage, and outdoors also listed for wet locations and sunlight resistant.
Is GFCI required at carnivals?
Yes, for the 125 V, 15 and 20 A receptacles and the equipment named in 525.23, with listed exceptions. Egress lighting is not GFCI protected.
Sources checked October 2026
- PSI Candidate Information Bulletin, Texas electrician examinations (updated September 15, 2026): https://test-takers.psiexams.com/api/content/bulletin/1682
- NFPA 70, National Electrical Code, 2026 Edition, Articles 525 and 590
