17.1 Signs & Outline Lighting
Key Takeaways
- Article 600 covers electric signs, outline lighting, and skeleton tubing under NEC 2023 — a Special Occupancies and Equipment topic on the Arkansas Prov JW exam.
- NEC 600.5 generally requires a dedicated branch circuit of at least 20 A that supplies no other load for signs and outline lighting systems (with listed exceptions).
- NEC 600.6 requires a disconnect that opens all ungrounded conductors, is within sight of the sign (or controllable from within sight), and is accessible and capable of being locked in the open position where required.
- Signs and outline lighting systems must be listed per 600.3; field wiring, grounding/bonding (600.7), and marking still apply after listing.
- Do not size sign branch circuits from Article 410 luminaire rules alone — open Article 600 first when the stem says sign, outline lighting, or neon/LED sign power supply.
Why Article 600 Shows Up on the Arkansas JW Exam
Prov’s Arkansas Journeyman outline groups Special Occupancies and Equipment as its own content area. Within that cluster, Article 600 (Electric Signs and Outline Lighting) is a high-yield Special Equipment hit: dedicated circuits, disconnects within sight, listing, and bonding. The exam uses NEC 2023, 60 questions, 3 hours, 70% pass — you will not design a marquee, but you must know whether a sign may share a lighting circuit, where the disconnect must live, and what “listed” means for a field-installed power supply.
Tab 600.3, 600.5, 600.6, and 600.7. Keep Article 100 definitions nearby so you do not treat a sign as a luminaire under Article 410 when the stem clearly says electric sign or outline lighting.
Scope — What Article 600 Covers
Article 600 applies to the installation of conductors, equipment, and field wiring for electric signs, outline lighting, and skeleton tubing, including neon tubing and LED outline systems when installed as signs or outline lighting. It also addresses associated transformers, electronic power supplies, and ballasts/drivers that feed those systems.
Outline lighting is an arrangement of light sources to outline or call attention to certain features such as the shape of a building or structure. Electric signs are self-contained or field-assembled illuminated displays. On Prov stems, “channel letters,” “neon border,” “LED sign cabinet,” and “outline lighting on a storefront” all point to Article 600 — not Article 410 closet clearances or bathtub zones.
Exam trap: A stem about a pendant over a tub is 410.10(D). A stem about a storefront neon outline or a freestanding electric sign is Article 600. Wrong article = wrong disconnect and branch-circuit answers.
Listing — 600.3
600.3 requires electric signs, section signs, outline lighting, and associated equipment such as transformers and electronic power supplies to be listed unless specifically permitted otherwise. Field-built “shop signs” that were never listed are not a journeyman workaround. After listing, 110.3(B) still forces you to follow the installation instructions — wet-location marks, supply ratings, and secondary bonding details included.
Skeleton tubing and certain field-installed secondary wiring have detailed rules in Parts of Article 600; for exam day, the first gate is: is the equipment listed for the use? If the stem says an unlisted power supply was field-fabricated for a neon sign, the installation fails 600.3 before you reach ampacity math.
Branch Circuits — 600.5
600.5 is the branch-circuit workhorse:
- Signs and outline lighting systems shall be supplied from a branch circuit that supplies no other load (general rule).
- That branch circuit shall be rated not less than 20 amperes.
- Exceptions exist (for example, certain portable or cord-connected signs, or systems that meet listed exception text) — always verify the exact 2023 exception language in the book rather than inventing a “small sign” carve-out.
Practical Prov pattern: A 15 A general-purpose lighting circuit that also feeds a wall sign fails the dedicated-circuit rule. A 20 A sign circuit that also feeds a nearby receptacle for a cash register fails the “no other load” rule. Size conductors and overcurrent protection for the continuous nature of many sign loads using Chapter 2 / continuous-load rules where applicable, but open 600.5 first for the dedicated-circuit requirement.
| Stem clue | Open first |
|---|---|
| Sign shares lighting circuit | 600.5 |
| Minimum sign branch-circuit rating | 600.5 (20 A) |
| Luminaire over bathtub | 410.10(D) |
| Closet lamp clearance | 410.16 |
Disconnecting Means — 600.6
600.6 requires each sign and outline lighting system (and each section sign, where applicable) to have a disconnecting means that opens all ungrounded conductors. Key location and control rules Prov loves:
- The disconnect shall be within sight of the sign, or the disconnect shall be capable of being locked in the open position and located in accordance with the section — and controls must allow the sign to be de-energized for servicing as the Code describes.
- For signs with controllers, electronic power supplies, or multiple sections, read whether the disconnect must be within sight of the controller / power supply as well as the illuminated portion.
- The disconnect must be accessible and must disconnect the sign from the supply — not merely a switch that drops only one branch of a multiwire set while leaving another hot.
Within sight (Article 100) means visible and not more than 50 feet (15 m) distant. A lockable disconnect in a locked electrical room that is not within sight fails unless the arrangement meets the specific 600.6 pathway that allows a lockable remote disconnect with the required control/identification.
Exam trap: A breaker in a panel 80 ft away, not within sight, and not lockable/identified as the sign disconnect, is a classic wrong answer — even if the breaker “feeds only the sign.”
Grounding, Bonding, and Secondary Circuits — 600.7 and Related
Metal parts of signs and outline lighting systems generally require equipment grounding and bonding continuity per 600.7 and Article 250. Transformers and electronic power supplies for neon/LED outline systems often have specific bonding of secondary circuits and metal enclosures. Do not leave a metal sign cabinet floating because “it is on a nonmetallic raceway” — provide an equipment grounding conductor and bond as required.
Secondary wiring for neon and certain outline systems has voltage, insulation, and support rules in later parts of Article 600. On the JW exam, expect recognition items more than deep neon secondary design: listed GTO cable, proper bushings, and bonding of metallic parts on the secondary side when required.
Marking, Location, and Service Practice
Signs must be marked with manufacturer information, voltage, and current or wattage as required by Article 600 marking sections. Outdoor signs need suitable wet/damp listing. Portable or cord-connected signs have additional limits — do not substitute a flexible cord for a permanent Chapter 3 wiring method unless 600 expressly allows that configuration.
When servicing, the disconnect rule is a safety item as much as a Code item: lockout/tagout and opening all ungrounded conductors protect against shock from parallel neon sections and capacitive coupling on outline systems.
Arkansas Prov Takeaway
For Special Equipment sign items, run this checklist: (1) listed (600.3); (2) dedicated ≥20 A branch circuit with no other load (600.5); (3) disconnect opening all ungrounded conductors, within sight / lockable as required (600.6); (4) bond/ground metal parts (600.7). If the stem is really a bathroom pendant or closet lamp, leave Article 600 and open 410.
Per NEC 600.5, an electric sign branch circuit is generally required to be rated not less than which of the following, and to supply no other load?
Under NEC 600.6, the disconnecting means for an electric sign must open which of the following?
NEC 600.3 generally requires electric signs, outline lighting, and associated power supplies to be which of the following?
A Prov stem describes a metal electric sign cabinet. Which Article 600 topic primarily addresses equipment grounding and bonding of metal sign parts?