1.6 Oklahoma's Adopted 2023 NEC: OUBCC Amendments You Must Know
Key Takeaways
- The Oklahoma Uniform Building Code Commission adopted the 2023 NEC as the statewide minimum code for commercial electrical construction under 59 O.S. § 1000.23, effective September 14, 2024 (OAC Title 748, Chapter 20, Subchapter 10).
- Oklahoma modified 210.8(F) to delete the expiration date on Exception No. 2, so listed HVAC equipment remains exempt from the outdoor dwelling GFCI requirement in Oklahoma rather than losing the exemption on a sunset date.
- Oklahoma added 422.16(B)(5), permitting a gas-fired central furnace serving a dwelling unit to be cord-and-plug connected with an equipment grounding conductor, a grounding-type plug, adequate ampacity, protection from physical damage, and a cord no longer than 9 feet.
- None of Informative Annexes A through K are adopted as part of the Oklahoma statewide minimum code (OAC 748:20-10-3), although the annual-permit provision of Annex H 80.19(D) was adopted with modifications.
- The OUBCC did not pull, review, or incorporate NFPA errata or Tentative Interim Amendments to the 2023 NEC, so the printed 2023 NEC as amended by Subchapter 10 is the governing text.
1.6 Oklahoma's Adopted 2023 NEC: OUBCC Amendments You Must Know
The PSI Candidate Information Bulletin does not simply say "2023 NEC." It says NFPA 70 — National Electrical Code, 2023 Edition, as revised and adopted by the Oklahoma Uniform Building Code Commission. That qualifier matters, because Oklahoma changed two sections of the Code and declined to adopt several others. A candidate who studies a generic national journeyman course will study one of those two sections backwards.
1. The Adoption Chain
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| HOW THE CODE BECOMES LAW IN OKLAHOMA |
| |
| NFPA publishes NFPA 70 (NEC), 2023 Edition |
| | |
| v |
| OUBCC adopts it under 59 O.S. Sec. 1000.23 as the STATEWIDE MINIMUM |
| CODE for commercial electrical construction -> OAC Title 748, |
| Chapter 20, Subchapter 10 (effective 9-14-2024) |
| | |
| v |
| OAC 158:40-1-4 makes the OUBCC-adopted NEC (plus the electrical portion |
| of the adopted IRC) the CIB "standard of installation" |
| | |
| v |
| Municipal inspection departments enforce it in the field |
| (59 O.S. Sec. 1693); local amendments must meet or exceed the minimum |
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Three consequences follow from the phrase statewide minimum code for commercial electrical construction:
- It is a floor, not a ceiling. Another jurisdiction inside Oklahoma may adopt more stringent local requirements; it may not adopt less.
- One- and two-family dwellings are reached through the IRC. OAC 158:40-1-4 names both the NEC and the electrical portion of the International Residential Code as the standards of installation, each as adopted by the OUBCC.
- Anything Subchapter 10 does not modify is adopted as published. OAC 748:20-10-4 states that all chapters and provisions not specifically addressed as modified, deleted, moved, or removed are adopted without modification.
2. Amendment One — 210.8(F) Outdoor Outlets (Chapter 2)
The national 2023 text of 210.8(F) requires GFCI protection for outdoor outlets serving dwelling units, with an exception for listed HVAC equipment that carried an expiration date. Oklahoma deleted that expiration date. As adopted by OAC 748:20-10-8, the Oklahoma rule reads:
All outdoor outlets for dwellings, other than those covered in 210.8(A) Exception No. 1, supplied by single-phase branch circuits rated 150 volts or less to ground and 50 amperes or less, shall be provided with GFCI protection, including outlets installed in:
- Garages that have floors located at or below grade
- Accessory buildings
- Boathouses
If equipment supplied by an outlet covered by this section is replaced, the outlet shall be provided with GFCI protection.
Exception No. 1: GFCI protection shall not be required on lighting outlets other than those covered by 210.8(C). Exception No. 2: GFCI protection shall not be required for listed HVAC equipment.
| Question on the exam | Oklahoma answer |
|---|---|
| Does a listed outdoor condensing unit at a dwelling need GFCI protection? | No — Exception No. 2 applies, and Oklahoma removed the sunset date that would otherwise have retired it. |
| Does an outdoor lighting outlet at a dwelling need GFCI protection? | No, unless it falls under 210.8(C) (the crawl-space/lighting provisions referenced there). |
| A homeowner replaces an outdoor outlet-supplied appliance. Any new obligation? | Yes — replacing the equipment supplied by such an outlet triggers GFCI protection for that outlet. |
| Does the rule reach a detached garage or a boathouse? | Yes — garages with floors at or below grade, accessory buildings, and boathouses are named explicitly. |
3. Amendment Two — 422.16(B)(5) Gas-Fired Central Furnaces (Chapter 4)
Oklahoma added a subsection to Article 422 that does not exist in the national Code. OAC 748:20-10-10 adopts Chapter 4 with this addition:
422.16(B)(5) Gas-fired central furnaces. Gas-fired furnaces supplying dwelling units shall be permitted to be connected by a flexible cord-and-plug. The flexible cord shall have an equipment grounding conductor and be terminated into a grounding-type attachment plug. The cord and attachment plug shall have sufficient ampacity for the load, and shall be routed or otherwise protected to prevent physical damage to the cord or attachment plug. The cord length shall not be greater than 9 feet.
The stated purpose is practical: a cord-and-plug furnace connection lets a homeowner move the furnace onto a portable generator for heat during an outage. Five conditions travel with the allowance, and an exam item will usually change exactly one of them:
- The occupancy must be a dwelling unit.
- The furnace must be gas-fired (this is not a blanket cord allowance for electric furnaces or air handlers).
- The cord must contain an equipment grounding conductor and terminate in a grounding-type attachment plug.
- The cord and plug must have sufficient ampacity for the load.
- The cord must be routed or protected against physical damage and must not exceed 9 feet.
4. What Oklahoma Did Not Adopt
- Informative Annexes A through K are not adopted (OAC 748:20-10-3). They remain printed in the codebook you carry into the test center — Annex C conduit-fill tables, Annex D calculation examples, Annex H administration — and PSI writes conduit-fill items to those tables, but they are not part of Oklahoma’s enforceable statewide minimum code. Other jurisdictions in Oklahoma may adopt any or all of the annexes under 59 O.S. § 1000.29.
- One annex provision was pulled back in with modifications: the annual permit of Annex H 80.19(D), rewritten to require the permit holder to keep detailed alteration records and to have the building official collect the per-permit fees at the end of the annual term.
- Errata and Tentative Interim Amendments were not incorporated. OAC 748:20-10-1(c) states plainly that the OUBCC has not pulled, reviewed, or incorporated any published errata or TIAs from the NFPA website. The governing text is the printed 2023 NEC as amended by Subchapter 10.
- Article 90 was adopted for continuity only, and only to the extent its provisions do not conflict with Oklahoma law or with the lawful exercise of code administration and enforcement jurisdiction.
[!WARNING] Chapter 1, Chapter 5, Chapter 6, Chapter 7, and Chapter 8 modifications from earlier Oklahoma adoptions were revoked in the 2024 rulemaking. "Revoked" in this document does not delete the corresponding NEC chapter — it means the earlier Oklahoma modification is gone and the language reverts to the published 2023 NEC without amendment. Do not study an old Oklahoma amendment list.
A listed outdoor air-conditioning condensing unit serves a single-family dwelling in Tulsa and is supplied by a 240-volt, 40-ampere single-phase branch circuit. Under the 2023 NEC as adopted and modified by the OUBCC, is GFCI protection required for that outlet?
Under the Oklahoma-added 422.16(B)(5), which installation is compliant?
A candidate plans to answer conduit-fill questions from Annex C of the NEC. What is the correct understanding of Annex C in Oklahoma?
Which statement correctly describes the legal status of the OUBCC-adopted 2023 NEC in Oklahoma?