AFCI protection when remodeling existing circuits
When existing branch-circuit wiring that serves an AFCI-required area of a home is extended, modified or replaced, the circuit must get AFCI protection. A short extension of 6 ft or less that adds no outlets or devices is exempt.
What the code requires
In homes, the NEC requires arc-fault (AFCI) protection on 120-V, single-phase, 10-, 15- and 20-A branch circuits that serve bedrooms, living and family rooms, dining rooms, kitchens, dens, libraries, parlors, sunrooms, recreation rooms, hallways, closets, laundry areas and similar spaces. Section 210.12(E) covers what happens when wiring on one of those existing circuits is changed. It also reaches the dormitory areas in 210.12(C) and the other occupancies in 210.12(D).
If branch-circuit wiring serving any of those areas is modified, replaced or extended, the circuit must be protected in one of two ways: by any of the AFCI methods the code allows for new work in 210.12(A), or by a listed outlet branch-circuit type AFCI placed at the first receptacle outlet of the existing circuit. Every AFCI must be listed and installed where it is readily accessible.
On the job
- Bathrooms, garages and outdoor areas are not on the dwelling AFCI list, so this rule does not reach a circuit that serves only those areas.
- Replacing a receptacle in one of the listed areas also requires AFCI protection, under 406.4(D)(4). For an older two-prong outlet, a combination AFCI/GFCI receptacle is one option your electrician may use.
- The exemption is narrow. An extension longer than 6 ft, or one that adds any outlet or device other than a splice, needs AFCI protection.
Exceptions that matter
- No AFCI is needed when the existing circuit conductors are extended 6 ft or less and nothing is added except splicing devices. Wire inside an enclosure, cabinet or junction box is not counted in the 6 ft.
What changed in 2023
This rule was 210.12(D) in the 2020 NEC; the 2023 edition renumbered it 210.12(E) and retitled it without changing how it works. Because it covers the areas in 210.12(B) through (D), it also picked up the 2023 additions of 10-A circuits and sleeping quarters in fire, police, ambulance, rescue and ranger stations.
Related sections
- NEC 210.12(A)
- NEC 210.12(B)
- NEC 210.12(D)
- NEC 406.4(D)(4)
- NEC 210.8
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