Weekend wiring at a side-by-side duplex
The owner lives in unit A. He filed a homeowner Request for Electrical Inspection and is rewiring unit B himself between tenants. What's the problem?
- The homeowner exemption does not cover a unit rented to or occupied by others, so unit B must be wired by a licensed electrical contractor
- NM cable is not permitted in a two-family dwelling; the owner must use MC or conduit
- Owning the building is enough; any owner on the title may wire any unit under a homeowner permit
- Nothing. This installation is compliant
Show the answer and the code reference
The answer
The owner is using the homeowner exemption to wire a rental unit, and the exemption only covers a home the owner personally occupies.
Correct choice: 1. The homeowner exemption does not cover a unit rented to or occupied by others, so unit B must be wired by a licensed electrical contractor
Minnesota lets an owner do electrical work without a license only on a home the owner personally occupies, or will occupy, as a residence (Minn. Stat. 326B.33, subd. 21; owner defined in 326B.31, subd. 23). DLI's homeowner guidance applies the exemption to a single-family home and says an unlicensed owner may not install wiring in a two-family dwelling or on any property rented, leased, or occupied by others. The point is to protect tenants, who did not choose an unlicensed installer. When an owner files a homeowner Request for Electrical Inspection, they affirm that they own and occupy the residence and will personally do all of the work. Unit B is a rental unit in a duplex, so its wiring must be done by a licensed electrical contractor under that contractor's own permit.
How to fix it
Stop work in unit B and hire a licensed electrical contractor to file a Request for Electrical Inspection and complete the job. Any wiring already installed must be inspected, and possibly redone, under that contractor's permit. Because DLI's guidance excludes two-family dwellings, the owner should also ask the inspector whether the homeowner permit can stand at all.
Code references
Minn. Stat. 326B.33, subd. 21 — Exemptions from licensing
An individual who physically performs electrical work on a residential dwelling located on property the individual owns and actually occupies as a residence (or will occupy once construction is complete) does not need a license for that work, provided the dwelling has its own electrical utility service not shared with any other residential dwelling.
Drills citing 326B.33, subd. 21Minn. Stat. 326B.31, subd. 23 — Definitions: Owner
An owner is an individual who physically performs electrical work on premises the individual owns and actually occupies as a residence, or owns and will occupy as a residence upon completion of its construction.
Drills citing 326B.31, subd. 23Other DLI homeowner guidance — Electrical work by homeowners
An unlicensed homeowner may not install wiring in two-family dwellings, apartment or condominium buildings, certain townhouses, manufactured homes in parks, or on any property rented, leased, or occupied by others. The homeowner files a Request for Electrical Inspection and personally does all of the work.
Drills citing DLI homeowner guidanceNEC 2023 334.10(1) — Uses Permitted (NM cable)
Type NM cable is permitted in one- and two-family dwellings and their attached or detached garages and storage buildings.
Drills citing 334.10(1)
Minnesota
This drill tests a Minnesota licensing rule, not an NEC section. The owner exemption is in Minn. Stat. 326B.33, subd. 21 (owner defined in 326B.31, subd. 23), and DLI's guidance excludes two-family dwellings and rental property. Minnesota adopts the NEC without amendments, so 334.10 applies as published. The Board of Electricity adopted the 2026 NEC, also without amendment, for permits filed on or after Aug. 17, 2026 (exams moved to the 2026 NEC on Sept. 8, 2026); see the 2026 NEC note on this drill.
How Minnesota adopts the NECCitation under review. The subd. 21 exemption wording (including its 'separate electrical utility service' condition) and DLI's two-family and rental exclusions were confirmed only through search summaries of the statute, DLI material, and city handouts that quote DLI. The primary text could not be opened. A literal reading of subd. 21 could arguably reach a separately metered unit on owner-occupied property, so read the current statute alongside DLI's homeowner guidance. The answer holds under DLI's guidance.
Why the other choices are wrong
- NM cable is not permitted in a two-family dwelling; the owner must use MC or conduit. NEC 334.10(1) permits NM cable in one- and two-family dwellings. The wiring method is not the issue; who is doing the work is.
- Owning the building is enough; any owner on the title may wire any unit under a homeowner permit. Minnesota's owner exemption requires that the owner also occupy the premises as a residence, and DLI does not extend it to two-family dwellings or to property rented, leased, or occupied by others.
- Nothing. This installation is compliant. Unit B is a rental unit in a two-family dwelling, which falls outside the owner exemption. A homeowner permit cannot cover it.