NEC 90.13: before 2023

NEC 90.13 does not exist as a standalone section in editions before the 2023 NEC. If you're working under the 2017 or 2020 code cycle and someone cites "90.13," they're either looking at a draft, a 2023+ reference, or confusing it with another article. Knowing what lived where before 2023 matters when you're pulling permits in jurisdictions still on older cycles.

What 90.13 Actually Covers (2023 and Later)

In the 2023 NEC, Article 90.13 addresses the relationship between the NEC and other installation standards, specifically recognizing that certain equipment and systems are covered by other NFPA standards or product standards. It points installers toward documents like NFPA 70E for workplace electrical safety and NFPA 79 for industrial machinery.

Before 2023, this guidance was scattered. Some of it lived in 90.2 (Scope), some in 90.3 (Code Arrangement), and cross-references to other NFPA standards appeared in informational notes throughout Article 90 and Chapter 1.

Where to Look in 2017 and 2020 NEC

If you're on a pre-2023 cycle, here's where the equivalent content sits. Jurisdictions often lag two cycles behind, so this is still common on the job.

• NEC 90.2(A) and (B): Scope, what's covered and what's not
• NEC 90.2(B)(5): Installations under exclusive control of utilities
• NEC 90.3: Code arrangement, Chapters 1-4 as general, 5-7 as special
• NEC 90.4: Enforcement and AHJ authority
• NEC 90.5: Mandatory rules, permissive rules, explanatory material
• NEC 90.7: Examination of equipment for safety (listing and labeling)

The 2020 cycle added some clarifying language to 90.2(B) regarding communications equipment and utility scope, but nothing that resembles the 2023 90.13 consolidation.

Why the 2023 Renumbering Happened

The 2023 NEC underwent a structural reorganization in Article 90 to align with the NFPA's standardized chapter format. Sections were renumbered, and new sections like 90.13 were added to clarify the NEC's relationship to adjacent standards. This was administrative, not technical. Nothing changed about how you install conductors or size a panel.

If you're bidding a job in a jurisdiction that adopts codes on a delayed cycle, confirm which NEC edition is enforced before quoting code sections in submittals or RFIs.

Tip: Call the AHJ before you pull the permit. Ask which NEC edition they've adopted and whether they have local amendments. Don't assume the newest edition is in force. Many municipalities are still on 2017 or 2020.

Cross-Referencing Other Standards

Even without a dedicated 90.13 in pre-2023 editions, the NEC has always expected you to coordinate with other standards where they apply. On industrial and commercial work, this matters.

1. NFPA 70E: Arc flash, PPE, energized work permits. Covered by OSHA enforcement, referenced in NEC informational notes.
2. NFPA 79: Industrial machinery wiring. Applies to the control panel and machine, not the branch circuit feeding it.
3. NFPA 72: Fire alarm systems. NEC Article 760 references it directly.
4. NFPA 99: Health care facilities. Works alongside NEC Article 517.
5. UL 508A: Industrial control panel listing standard.

On a typical commercial job in 2017 or 2020 code, the boundary between NEC and NFPA 79 is the disconnect ahead of the machine. You wire to the disconnect under NEC rules. What's inside the machine enclosure follows NFPA 79 and UL 508A.

Practical Impact on Field Work

For day-to-day residential and light commercial, the pre-2023 absence of a section labeled "90.13" changes nothing about how you rough-in, trim, or terminate. You still follow 210, 220, 250, 310, and the rest of Chapters 1 through 4 as general rules.

Where it matters is documentation. If your submittal references "NEC 90.13" on a 2020-code job, the plan reviewer may kick it back for an invalid citation. Use the correct reference for the edition in force.

Tip: Keep a copy of the NEC edition your jurisdiction enforces in your truck or on your phone. Citing the wrong edition on a permit application or inspection punch list burns time you won't get back.

How to Verify Which Edition Applies

State adoption is not uniform. As of early 2026, some states are on the 2023 NEC, some on 2020, and a handful still reference 2017. Local amendments stack on top of whatever state adopts.

• Check the state electrical board website for adopted edition
• Check the city or county building department for local amendments
• Confirm with the AHJ at permit application
• Reference the effective date, not just the edition year, amendments often phase in

If a spec sheet or engineer's drawing cites NEC 90.13 and you're working under 2020 code, flag it in an RFI. Either the designer is working from the newer edition, or they mean a different section. Don't guess, get it in writing.