Electrical Code & Permits
Explain how the NEC is organized and enforced, find out which edition applies, and take a job through permits and inspections without surprises.
Table of contents
Code knowledge is more than memorized numbers. You also have to know which code applies to your job, who enforces it, when you need a permit and what an inspector looks at. Electricians who understand that system pass inspections the first time and stay out of legal trouble. This guide covers how the National Electrical Code works, and how a job moves from permit to final approval.
What You Will Be Able to Do
- Explain what the NEC is, how it becomes law and who enforces it.
- Read a code citation and find a rule by article.
- Say how a local amendment and a conflict between sections are handled.
- Decide when a permit is needed, and describe the inspection stages.
- Avoid the most common violations.
What the NEC Is
The National Electrical Code, also called NFPA 70, is a model code published by the National Fire Protection Association. NFPA revises it every three years. The 2020, 2023 and 2026 editions are the ones you will meet most. The NEC is a minimum standard for safety. It is not a design manual, and it is not a guide to good workmanship, though it does require work to be done in a neat manner.
On its own, the NEC is not a law. It becomes enforceable when a state, county or city adopts it.
Which Edition Applies
Adoption varies. In late 2026, a small but growing number of states enforce the 2026 NEC. Many are on 2023, and some are on 2020 or older. A few states leave adoption to cities and counties. A jurisdiction can also skip an edition or adopt one with significant changes. So two jobs an hour apart can follow different rules.
Before you start any job, find out:
- Which edition is adopted where the job is.
- What local amendments apply.
- Whether the utility has its own rules for services and meters.
The building department or your state licensing board can tell you. NFPA also publishes an enforcement map online.
Local amendments always control. If the city requires conduit where the NEC allows NM cable, you run conduit. The rule the Authority Having Jurisdiction enforces is the rule for that job.
The Authority Having Jurisdiction
The Authority Having Jurisdiction (AHJ) is the organization or person responsible for enforcing the code and approving installations. It is usually the local electrical inspector, the building department or a state agency. On some sites the AHJ may be a fire marshal, an insurance inspector or a federal agency. The AHJ can interpret the code and can sometimes approve an alternate method, as long as it provides the same level of safety.
How the NEC Is Organized
| Part | Contents |
|---|---|
| Article 90 | Introduction, purpose and how the code is applied |
| Chapter 1 | General: definitions, general requirements, load calculations |
| Chapter 2 | Wiring and protection: branch circuits, services, overcurrent, grounding |
| Chapter 3 | Wiring methods and materials: cables, raceways, boxes |
| Chapter 4 | Equipment for general use: receptacles, panels, motors, appliances |
| Chapter 5 | Specific occupancies: hazardous locations, health care, assembly |
| Chapter 6 | Specific equipment: signs, pools, EV charging, solar |
| Chapter 7 | Specific conditions and limited-energy systems |
| Chapter 8 | Communications systems, greatly reduced in the 2026 edition |
| Chapter 9 | Tables, such as conduit fill and conductor properties |
| Informative annexes | Extra help, not enforceable |
Chapters 1 through 4 apply generally. Chapters 5, 6 and 7 can change or add to those rules for particular situations. Older editions called those chapters "special" rather than "specific."
The 2026 edition also made changes that affect your codebook habits:
- Load calculations moved from Article 220 to new Article 120.
- Most limited-energy and communications wiring rules moved to Articles 720 through 750, so Chapter 8 no longer stands alone.
- Rules for systems over 1,000 volts AC moved into Articles 265 through 270.
- Protection against physical damage moved from 300.4 to 300.6.
- Informative Annex L previews a larger reorganization planned for the 2029 edition.
So a section number can change between editions, even when the rule stays the same.
Reading a Citation
A citation is an address. Take 210.8(A)(7):
- 210 is the article, which is Branch Circuits.
- .8 is the section, GFCI Protection.
- (A) is the first level subdivision, Dwelling Units.
- (7) is the list item.
Citing a rule that precisely shows you found the exact rule that applies. It also lets the inspector check it quickly.
Words That Matter
- Shall and shall not are requirements.
- Shall be permitted means it is allowed, but not required.
- Informational notes explain or give references. They are not requirements.
- Exceptions follow the rule they change. Read them.
- Article 100 holds definitions. If a term matters, look it up. "Readily accessible" and "accessible" are not the same thing.
When two sections seem to conflict, the more specific rule governs the general one for that situation. A pool rule in Article 680 controls over a general wiring rule in Chapter 3, for that pool.
Useful Articles
| Article | Topic |
|---|---|
| 100 | Definitions |
| 110 | General requirements, including working space |
| 120 (220 in older editions) | Load calculations |
| 210 | Branch circuits |
| 230 | Services |
| 240 | Overcurrent protection |
| 250 | Grounding and bonding |
| 300 to 399 | Wiring methods and materials, with Article 300 as the general rules |
| 314 | Boxes |
| 334 | NM cable |
| 406 | Receptacles and, from 2026, device-type switches |
| 408 | Panelboards |
| 430 | Motors |
| 625 | EV charging |
| 680 | Pools |
| 690 | Solar |
Many electricians tab their books at these articles. It saves time on the job, and exams usually allow it.
Permits
A permit is the local government's record that work will be inspected. Rules vary widely, so call the building department if you are unsure.
| Permit usually needed | Permit often not needed |
|---|---|
| New circuits or added outlets | Replacing a like-for-like receptacle, switch or fixture |
| New construction, additions, remodels | Replacing a breaker of the same type and rating |
| Panel replacement or service upgrades | Minor appliance repairs |
| EV chargers, generators, solar | Some low-voltage work, depending on the location |
| Hot tubs, pools |
Pulling a Permit
- Confirm the contractor is licensed for that jurisdiction. In most places, the person who pulls the permit is responsible for the work.
- Prepare the scope, including circuits, panel size and major equipment.
- Include load calculations and drawings, if requested.
- Pay the fee and post the permit on site.
Homeowners can pull a permit for work on their own homes in many places, but they are held to the same code, and they must usually do the work themselves.
Inspections
Most jobs get at least two inspections. Larger projects get more.
| Inspection | Timing | What it covers |
|---|---|---|
| Underground | Before a trench or footing is covered | Burial depth, raceways, concrete-encased electrodes |
| Rough-in | After wiring and boxes, before walls close | Conductors, boxes, securing, protection, grounding |
| Service | Before the utility connects | Panel, meter, grounding, bonding, working space |
| Final | After devices and fixtures are in | GFCI and AFCI operation, labels, covers, equipment |
The purpose of a final inspection is to confirm the work complies and is safe before the building is used.
If you fail, you get a correction notice. Make the corrections, and call for a re-inspection. Do not cover work that has not passed. If you do, the inspector can require you to open it back up.
Working With Inspectors
- Do your own inspection first, room by room.
- Be there when the inspector arrives.
- Keep the plans and permit available.
- If you disagree, stay calm and ask for the code section. Most jurisdictions have an appeals process.
- Take photos of work before it is covered.
An inspector who finds a problem before the drywall goes up has saved you from a tear-out later.
Common Violations
| Violation | The rule behind it |
|---|---|
| Missing GFCI or AFCI protection | 210.8 and 210.12 |
| Cable not secured, or secured too far from boxes | Wiring method articles, such as 334.30 |
| Overfilled boxes | 314.16 |
| Boxes set too deep | 314.20 |
| Wrong wire size for the breaker | 240.4 |
| Missing nail plates | 300.4, or 300.6 in the 2026 edition |
| Unclamped cables at panels | 312.5 |
| Missing bonds or a neutral bonded at a subpanel | Article 250 |
| Vague panel directory | 408.4 |
| Blocked working space | 110.26 |
| Terminations not torqued to the listed value | 110.14(D) |
| No surge protective device on a new dwelling service | 230.67 |
| Panel in a bathroom or clothes closet | 240.24 |
| Standard receptacles where tamper-resistant ones are required | 406.12 |
| Extension cords used as permanent wiring | Article 400 |
Working space catches many jobs late. For a typical 120/240-volt panel, NEC 110.26 calls for 36 inches of clear depth, 30 inches of width and 6-1/2 feet of height, with no storage in that space. Moving a panel after the walls are finished is expensive.
Torque is another rule that surprises people. Since the 2017 edition, NEC 110.14(D) has called for terminations to be tightened to the listed value with an approved means, such as a calibrated torque tool.
Extension cords are a common trap on service calls. Flexible cords are meant for temporary use. They cannot replace fixed wiring, run through walls or ceilings, or be hidden above a ceiling.
Unpermitted Work
Skipping a permit can look like a way of saving money, but the risks are serious:
- Insurance: an insurer may contest a claim tied to unpermitted work.
- Liability: the person who did the work can be held responsible for a fire or injury.
- Home sales: sellers may have to disclose the work, and the buyer or the city may require walls to be opened for inspection and permits to be pulled after the fact.
- Fines: many jurisdictions charge double fees or issue stop-work orders.
- Your license: working without a permit can put a license at risk.
Common Mistakes
| Mistake | What it costs |
|---|---|
| Assuming your last job's edition applies | Rework and failed inspections |
| Skipping local amendments | The same, plus lost trust with the inspector |
| Citing a section from memory | An argument you lose when the number has moved |
| Covering work before approval | Opening walls at your own expense |
| Treating an informational note as a rule | Wrong conclusions, in either direction |
Check Your Understanding
1. A city enforces the 2023 NEC. The 2026 edition has come out with a rule you like better. Which rule applies?
The 2023 NEC as adopted, plus local amendments, until the city adopts a newer edition. You can always exceed the code, but you cannot go below what is adopted.
2. A new term in a section is not clear. Where do you look first?
Article 100.
3. Your plans show a pool bonding detail that seems to conflict with a general rule in Article 250. Which controls?
The more specific rule for that installation, here Article 680.
4. You are replacing a 100-amp panel with a new one of the same size. Do you need a permit?
Almost everywhere, yes. Replacing a panel usually needs a permit and an inspection, even at the same size.
Key Takeaways
- The NEC is revised every three years, and it applies only where it has been adopted.
- The AHJ decides what is enforced, and local amendments always control.
- Chapters 1 to 4 are general, and Chapters 5 to 7 change them for specific situations.
- In the 2026 edition, several articles and sections moved, so check the number for your edition.
- Pull permits, schedule inspections and never cover uninspected work.
- Unpermitted work can follow a building and a contractor for years.